Stone XN650R User manual

OPERATOR/SERVICE MANUAL
MODEL: XN650R, XN650ROI, XT728R,
XT728ROI, XM832R, XM832ROI,
XJ834HG, XD836Y
STOMPER®- 2 Cycle Oil Injected and Pre-Mix,
4 Cycle and Diesel
REVISION: F 5/02 P/N 56318
A100%employee-ownedAmericanmanufacturer

TABLEOFCONTENTS
OPERATOR/SERVICEMANUAL
STOMPER
FOREWORD ....................................................................................................................................... 6
LIMITEDWARRANTY ..................................................................................................................................... 7
SECTION1-TECHNICALDATA ....................................................................................................................9 - 10
1.1 Machine Sound Level Test ........................................................................................................... 10
1.2 Vibration Tests .............................................................................................................................. 10
SECTION2-HEALTH&SAFETY .................................................................................................................. 11 - 14
SECTION3-OPERATIONS/ROUTINEMAINTENANCE-2-CYCLEOILINJECTEDSTOMPER .............. 15 - 21
3.1 Specifications ................................................................................................................................ 16
3.2 Operating Principle ........................................................................................................................ 17
3.3 Pre-Operation Checks.................................................................................................................... 17-19
3.3.1 SparkPlug ......................................................................................................................17
3.3.2 Starter Screen ................................................................................................................. 17
3.3.3 Fasteners ....................................................................................................................... 17
3.3.4 FuelMixture ................................................................................................................... 17-18
3.3.5 OilPipe Replacement ..................................................................................................... 18
3.3.6 Lubrication.....................................................................................................................18
3.3.7 AirCleaner ..................................................................................................................... 19
3.4 To Start Machine........................................................................................................................... 19
3.5 To Stop Machine........................................................................................................................... 19
3.6 Operation of Machine ................................................................................................................... 19
3.7 Throttle Control CableAdjustment ............................................................................................... 20
3.8 Setting High RPM ......................................................................................................................... 20
3.9 Throttle HandleAdjustment.......................................................................................................... 20
3.10 Idle Setting .................................................................................................................................... 20
3.11 Storing Stompers ........................................................................................................................... 21
SECTION4-OPERATIONS/ROUTINEMAINTENANCE-DIESELSTOMPER ...........................................23 - 33
4.1 Specifications ................................................................................................................................ 24
4.2 Operating Principle ........................................................................................................................ 25
4.3 Pre-Operation Checks.................................................................................................................... 25-26
4.3.1 Engine Checks ............................................................................................................... 25
4.3.2 Starter Screen ................................................................................................................. 26
4.3.3 Fasteners ....................................................................................................................... 26
4.3.4 Lubrication.....................................................................................................................26
4.3.5 AirCleaner ..................................................................................................................... 26
4.4 To Start Machine........................................................................................................................... 26-27

4.5 To Stop Machine........................................................................................................................... 27
4.6 Operation of Machine ................................................................................................................... 27
4.7 Lifting and Transporting ............................................................................................................... 27
4.8 Engine Idle .................................................................................................................................... 28
4.8.1 Fuel System.................................................................................................................... 28
4.9 Disassembly and Reassembly - Fuel Injection Pump .................................................................... 29
4.10 Fuel Injection Valve ....................................................................................................................... 29-30
4.11 Disassembly and Reassembly - Case Nut ..................................................................................... 30
4.11.1 Adjustment .................................................................................................................... 30-31
4.12 FuelFilter ...................................................................................................................................... 31
4.13 Speed Control Device.................................................................................................................... 31
4.14 Throttle Control CableAdjustment ...............................................................................................32
4.15 Setting High RPM ......................................................................................................................... 32
4.16 Throttle HandleAdjustment.......................................................................................................... 32
4.17 Storing Stompers ........................................................................................................................... 32-33
SECTION5-OPERATIONS/ROUTINEMAINTENANCE-2-CYCLEPRE-MIXSTOMPER ........................ 35 - 41
5.1 Specifications ................................................................................................................................ 36
5.2 Operating Principle ........................................................................................................................ 37
5.3 Pre-Operation Checks.................................................................................................................... 37
5.3.1 SparkPlug ......................................................................................................................37
5.3.2 Starter Screen ................................................................................................................. 37
5.3.3 Fasteners ....................................................................................................................... 37
5.3.4 FuelMixture ................................................................................................................... 37-38
5.3.5 OilPipe Replacement ..................................................................................................... 38
5.3.6 Lubrication.....................................................................................................................38
5.3.7 AirCleaner ..................................................................................................................... 38
5.4 To Start Machine........................................................................................................................... 39
5.5 To Stop Machine........................................................................................................................... 39
5.6 Operation of Machine ................................................................................................................... 39
5.7 Throttle Control CableAdjustment ............................................................................................... 40
5.8 Setting High RPM ......................................................................................................................... 40
5.9 Throttle HandleAdjustment.......................................................................................................... 40
5.10 Idle Setting .................................................................................................................................... 40
5.11 Storing Stompers ........................................................................................................................... 41
SECTION6-OPERATIONS/ROUTINEMAINTENANCE-4-CYCLEGASSTOMPER................................43 - 49
6.1 Specifications ................................................................................................................................ 44
6.2 Operating Principle ........................................................................................................................ 45
6.3 Pre-Operation Checks.................................................................................................................... 45
6.3.1 SparkPlug ......................................................................................................................45
6.3.2 Starter Screen ................................................................................................................. 45
6.3.3 Fasteners ....................................................................................................................... 45

6.3.4 FuelMixture ................................................................................................................... 45
6.3.5 Lubrication..................................................................................................................... 45-46
6.3.6 AirCleaner ..................................................................................................................... 46
6.4 To Start Machine........................................................................................................................... 46
6.5 To Stop Machine........................................................................................................................... 46
6.6 Operation of Machine ................................................................................................................... 47
6.7 Idle Speed Adjustment .................................................................................................................. 48
6.8 Air Vent Tube Inspection .............................................................................................................. 48
6.9 Throttle Control CableAdjustment ............................................................................................... 48
6.10 Setting High RPM ......................................................................................................................... 49
6.11 Throttle HandleAdjustment.......................................................................................................... 49
6.12 Storing Stompers ........................................................................................................................... 49
SECTION7-MAINTENANCE .........................................................................................................................51 - 54
7.1 Important - Maintenance Tasks..................................................................................................... 52
7.2 Instruction for Base Plate Removal ............................................................................................... 53
7.3 Instructionfor ServiceLower UnitXN OilInjected andPre-Mix StomperModel XN650 ............. 54
SECTION8-EXPLODEDVIEWSWITHPARTS........................................................................................... 55 - 95
8.1 Hardware Key................................................................................................................................ 57
8.2 Torque Charts................................................................................................................................ 58-59
8.3 Gearcasefor XN OilInjectedand Pre-Mix ..................................................................................... 60-61
8.4 Gearcase for XT Oil Injected and Pre-Mix ..................................................................................... 62-63
8.5 Gearcase for XM Oil Injected and Pre-Mix .................................................................................... 64- 65
8.6 Gearcase - XD Diesel ..................................................................................................................... 66-67
8.7 Gearcase -XJ4-Cycle .................................................................................................................... 68-69
8.8 Lower Unit for XNOil Injected and Pre-Mix.................................................................................. 70-71
8.9 LowerUnit for XTOilInjected and Pre-Mix .................................................................................. 72 -73
8.10 Lower Unit for XM Oil Injected andPre-Mix ................................................................................. 74- 75
8.11 LowerUnit forXD Dieseland XJ4-Cycle ..................................................................................... 76-77
8.12 Engine -XN/XT andXM OilInjected andPre-Mix ....................................................................... 78-79
8.13 Engine- XD Diesel ........................................................................................................................ 80-81
8.14 Engine- XJ 4-Cycle ....................................................................................................................... 82-83
8.15 Handle and Fuel Tank - XN Oil Injected and Pre-Mix .................................................................... 84-85
8.16 Handle and Fuel Tank - XT/XM Oil Injected and Pre-Mix............................................................. 86-87
8.17 Handle and Fuel Tank - XD Diesel ................................................................................................ 88-89
8.18 Handle and Fuel Tank - XJ 4-Cycle ............................................................................................... 90 -91
8.19 Shoes XT/XNOil Injectedand Pre-Mix......................................................................................... 92- 93
8.20 Decal Identification ....................................................................................................................... 94-95
CALIFORNIAPROPOSITION65WARNING ................................................................................................ 99

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Theseinstructionsinclude:
Safetyregulations
Operatinginstructions
Maintenanceinstructions
These instructions have been prepared for
operation on the construction site and for the
maintenance engineer.
Theseinstructions are intended to simplify
operation of the machine and to avoid
malfunctions through improper operation.
Observingthemaintenanceinstructions will
increase the reliability and service life of the
machinewhenusedontheconstructionsite
andreduce repair costs and downtimes.
Always keep these instructions at the place
of use of the machine.
Only operate the machine as instructed and
follow these instructions.
Observe the safety regulations as well as the
guidelines of the civil engineering trade
association. Observe safety rules for the
operation of compactors and the pertinent
regulations for the prevention of accidents.
StoneConstruction Equipment, Inc. is not
liable for the function of the machine when
used in an improper manner and for other
thanthe intended purpose.
Operatingerrors, improper maintenance and
theuseofincorrect operating materials are
not covered by the warranty.
The above information does not extend the
warranty and liability conditions of business
ofStone Construction Equipment, Inc.
StoneConstructionEquipment,Inc.
P.O. Box 150, Honeoye, New York 14471
Phone: [phone]
Fax: [phone]
Warranty Information
Please enter the following data. This will help
expedite any service or warranty work.
1. Machine Type: _______________________
Machine S/N: ________________________
2. Engine Type: _________________________
Engine S/N: __________________________
3. VIN: _______________________________
4. Purchase Date: _______________________
5. Dealer/Distributor Information:
Name: ______________________________
Address: ____________________________
____________________________________
Phone #: ____________________________
Fax #: ______________________________
Location of above information:
1. Information on S/N tag.
2. Information on engine tag.
3. Information on S/N tag - if applicable.
4. Date you purchased machine.
5. Dealer machine was purchased from.
FOREWORD

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L i m i t e d W a r r a n t y
The Manufacturer warrants that products manufactured shall be free from defects in material and
workmanship that develop under normal use for a period of 90 days for concrete vibrators and electric
pumps, one year for Rhino®, Bulldog®, WolfPac Rollers™, trowels, Stompers®, saws, forward plates,
engine powered pumps, Lift Jockey™, Mortar Buggy™and 6 months for all other products from the
date of shipment. The foregoing shall be the exclusive remedy of the buyer and the exclusive liability of the
Manufacturer. Our warranty excludes normal replaceable wear items, i.e.gaskets, wear plates, seals, O-
rings, V-belts, drive chains, clutches, etc. Any equipment, part or product which is furnished by the
Manufacturer but manufactured by another, bears only the warranty given by such other manufacturer.
(The Manufacturer extends the warranty period to“Lifetime”for the drum bearings and seals for the mortar
mixers, and agrees to furnish, free of charge, the bearings and seals only upon receipt of the defective
parts. The warranty is two years for eccentric bearings on the forward plate compactors, mortar and
plaster mixer drums, trowel gearboxes and five years on the Bulldog trench roller eccentric bearings.) A
Warranty Evaluation Form must accompany all defective parts. Warranty is voided by product abuse,
alterations, and use of equipment in applications for which it was not intended, use of non-manufacturer
parts, or failure to follow documented service instructions. The foregoing warranty is exclusive of all other
warranties whether written or oral, expressed or implied. No warranty of merchantability or fitness for a
particular purpose shall apply. The agents, dealer and employees of Manufacturer are not authorized to
make modification to this warranty, or additional warranties binding on Manufacturer. Therefore, additional
statements, whether oral or written, do not constitute warranty and should not be relied upon.
The Manufacturer’s sole responsibility for any breach of the foregoing provision of this contract, with
respect to any product or part not conforming to the Warranty or the description herein contained, is at its
option (a) to repair, replace or refund such product or parts upon the prepaid return thereof to location
designated specifically by the Manufacturer. Product returns not shipped prepaid or on an economical
transportation basis will be refused (b) as an alternative to the foregoing modes of settlement - the
Manufacturer’s dealer to repair defective units with reimbursement for expenses, except labor, and be
reviewed with the Manufacturer prior to repair. A Warranty Evaluation Form must accompany all warranty
claims.
Except as set forth hereinabove and without limitation of the above, there are no warranties or other
affirmations which extends beyond the description of the products and the fact hereof, or as to operational
efficiency, product reliability or maintainability or compatibility with products furnished by others. In no
event whether as a result of breach of contract or warranty or alleged negligence, shall the Manufacturer
beliable for specialor consequential damagesincluding but notlimited to:Loss of profitsor revenues, loss
of use of the product or any associated product, cost of capital, cost of substitute products, facilities or
services or claims of customers.
Noclaim willbeallowed forproducts lostor damaged intransit. Such claimsshould befiledwith thecarrier
within fifteen days.
Effective September 2001.
9/01P/N51018
Stone Construction Equipment, Inc.
8662 Main Street, P. O. Box 150
Honeoye, NY 14471-0150
Phone: [phone] • 1-585-229-5141
Fax: [phone]
www.stone-equip.com • e-mail: [e-mail]
Bred Tough,Technology Born To Work.
The Way It Ought To Be.

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1. TECHNICAL DATA

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MachineType: Stomper Compactor
Sound Level Meter Calibration Date: December 9, 1994
Meter Type: Simpson Model 886-2 Type 2
Test Date: December 9, 1994
TestConditions:
Temperature: 5 degrees Fahrenheit/-5 degrees Celsius
AmbientSound: 55 dba fast mode
SoilCondition: Sand and grit
MoistureLimit: Approximately equal to 50 percent
Engine Speed: 5000 rpm/83 Hz
Frequency: 700 rpm/11.7 Hz
Test Site: Honeoye, New York USA
Sound Level at Operator Position: 98 dba
1.1 MACHINESOUND LEVEL TEST
SOUND AND VIBRATION DATA
1.2 VIBRATION TESTS
The effective acceleration value, determined with respects to ISO 8662, Part I and calculated in
the domain are as follows:
Model RMS Acceleration, M/S2
XN650R 5.7
XT728R 5.1
XT728ROI 5.1
XM832R 6.5
XM832ROI 6.5

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2. HEALTH & SAFETY

- 12 -
SAFETY USE
These machines are designed to carry out the func-
tionofcompactingmaterial of thenon-cohesive,bitu-
minous and granular varieties.
Ifusedcorrectlythey will provideaneffectiveandsafe
meansofcompactionandmeettheappropriateper-
formancestandards.
Itisessentialthatthe driver/operator of the machine is
adequatelytrainedin itssafeoperation,beauthorized
to drive it,and have sufficient knowledge of the ma-
chine to ensure that it is in full working order, before
being put to use.

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• Keep feet clear of the machine’s shoe at all times.
• Be sure no one is in a position to be hit by operator’s hand or
armduringstarting.
• Donotleavethemachinerunningunattended.
• Keep work area free of bystanders.
• Do not operate this machine on any surface where it can get
out of control.
SAFETY PRECAUTIONS
Beforeusingthisequipment,study this entire
Owner’s Manual to become familiar with its
proper operation. Do not allow untrained or
unauthorizedpersonnel, especially children,
to operate this equipment. Use only factory
authorized parts for service. When safety
decalsare destroyed or missing, contact
factory immediately for replacement. For the
safety of yourself and others, it is imperative
that the following rules are observed. Failure
to do so may result in serious injury or death.
•Transport and handle fuel only when contained in approved
safetycontainers.
• Do not smoke when refueling or during any other fuel
handling operation.
• Do not refuel while the engine is running or while it is still hot.
• If fuel is spilled during refueling,wipe it off the engine
immediately and discard the rags in a safe place.
• Do not operate the equipment if fuel or oil leaks exist - repair
immediately.
• Neveroperate this equipment in an explosive atmosphere.
• This notation appears before warnings in the text. It means
that the step which follows must be carried out to avoid the
possibility of personal injury or death. These warnings are
intended to help the technician avoid any potential hazards
encountered in the normal service procedures. We strongly
recommendthat the reader takes advantageofthe
information provided to prevent personal injury or injury to
others.

- 14 -
• Never operate any gas powered equipment in a poorly
ventilatedor enclosed area.
• Avoid prolonged breathing of exhaust gases.
• Never perform any work on this equipment while it is running.
• Always stop the engine and disconnect the spark plug wire to
preventaccidental starting.
• Keep hands,clothing,and jewelry away from all moving
parts.
• Make sure all safety guards are secured and in proper
position.
• Avoidcontact with hot exhaust systems and
engines.
• Allow engine to cool before performing any
repairs or service.
• Earprotectionrequiredwhenoperatingthisequipment.

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3. OPERATIONS
2-CYCLE OIL
INJECTED

- 16 -
3.1 Specifications Oil-Injected Stomper®
*Soil conditions can affect specifications.
STONE
XN650ROI
125 lbs.
30.3" x 13.5" x 36.5"
10" x 13"
4 hp. Robin
EC12D
4300
50:1
3 qts.
Polyethylene
2600 lbs.
780
60' - 70' / Min.
3500 Sq. Ft./ Hr.
18"
2.5"
Extension
MODEL
Dimensions
Weight
Dimensions
(L x W x H)
Shoe Size
Operating System
Power
Engine Specs
Engine RPM
Fuel Mixture
Fuel Tank
Capacity
Fuel Tank
Material
Performance
Impact Force
Max. Blows/
Min.
Max. Forward
Travel Speed
Max.
Productivity
Max. Lift
Max.
Amplitude
Options
STONE
XT728ROI
130 lbs.
28.5" x 15" x 38"
11" x 13"
4 hp. Robin
EC12D
4300
50:1
3 qts.
Polyethylene
2800 lbs.
700
60' - 90' / Min.
4950 Sq. Ft./ Hr.
18"
Up to 4"
Extension
STONE
XM832ROI
158 lbs.
28.5" x 15" x 38"
11" x 13"
4 hp. Robin
EC12D
3900
50:1
3 qts.
Polyethylene
3200 lbs.
660
50' - 64' / Min.
3500 Sq. Ft./ Hr.
22"
Up to 3"
–

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3.2 OPERATING PRINCIPLE
Atamping shoe is mounted at the lower end of a cylindrical springhousing. Apiston,installedbetween
massive opposing springs inside the spring housing, is actuated by a connecting rod and crank system
which is driven by a high speed, 2 cycle gasoline engine through a gear train and centrifugal clutch.
The piston alternately loads and unloads the springs. This results in a rapid lifting up and ramming down
action of the tamping shoe to compact the underlying material.
TheStomper is effectivefor compaction of a widevariety ofjob soilsubstances,particularly clay lumps,
silt,loam and all granularmaterials. Althoughrelatively light in weightandeasyto operate, the Stomper
delivers a tremendous impact to the soil.
These instructions contain information to guide you in efficient use and proper maintenance of the
Stomper. To get long andtrouble-free service from this powertool,periodic maintenanceoftheengine
andmachine is essential.
The Stomper is shipped completely assembled and only requires filling with 2 cycle oil and regular
unleaded gasoline as well as a brief check of lubricant levels in preparation for operation. You should
firststudy these instructions.
OPERATING INSTRUCTIONS
3.3 PRE-OPERATION CHECKS
CAUTION: Sections on fuel mixture,air cleaner and lubrication must be followed exactly. Failure to
follow these instructions may void the warranty.
3.3.1 Spark Plug
Checkand clean sparkplugs regularly. A fouled,dirty,orcarboned sparkplug causes hard startingand
poor engine performance. Set spark plug gap as per specifications. See Engine Manual.
3.3.2 Starter Screen
Thisscreen keepsdirt,etc.fromenteringthefanhousing and cloggingthe air coolingpassages. Because
this engine is air-cooled,it is necessary to keep this screen clean at all times to permit the unrestricted
passage of air into the fan housing.
3.3.3 Fasteners
Checkallnutsand bolts after 4 hours,thenevery day of operation. Torquevaluesfor fastenersarefound
in the appropriate part drawings located in the back section of this manual.
3.3.4 Fuel Mixture
The gasoline and 2-cycle oil are not mixed prior to filling the unit.
Use regular unleaded gasoline. High test is not recommended.
Strain the fuel through a fine meshed screen when filling gasoline tank on engine to remove dirt if
present.

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NOTE: Special ratio for initial break-in period.
See chart below
3.3.5 Oil Pipe Replacement
Replace the oil pipe between oil tank and the joint every two (2) years.
NOTE: Afterreplacing the oil pipe, makesureto discharge air in thepipeasmuch as possible, and then
fill the fuel tank with gasoline mixed with 2-stroke engine oil at the ratio of 25 to 50 : 1.
After running with the mixture of gasoline for enough time to discharge the air completely, refill the
unleaded gasoline only for normal operation.
NOTE: The unit is equipped with a low oil shut-off sensor which is located inside the oil tank. When the
oil level in the tank drops low enough to actuate the switch,the unit will shut off,even though there is
still oil visible in the tank. The unit can not be restarted until the oil is replenished.
3.3.6 Lubrication
The oil level should be checked now and before first use of the Stomper. Thereafter,it should be
checked every day as follows.
FOR XN, XT AND XM SERIES
1. With unit standing upright (in vertical position--not operating) so that the oil drains freely into the
spring housing, check that the oil is at fill sight plug level.
2. Whenever the level is low,remove the fill sight plug and refill to level of fill sight plug with any
goodquality SAE-30.
NOTE: Use of a socket wrench is recommended to avoid damage to the sight gauge.
3. Change the oil every 300 operating hours or six months.
FUEL
Gasoline 50:1 EC12 Two Cycle Oil 20:1 All Units Break-In Two Cycle Oil Mix
(first 10 hours)
5 Gallons .80 pints (12.8 oz) (.38 L) 2.00 pints (32 oz) (.94 L)
1 Gallons .16 pints (2.56 oz) (..08 L) .40 pints (6.4 oz) (.19 L)
2 Quarts .08 pints (1.28 oz) (..04 L) .20 pints (3.2 oz) (.09 L)
h:\netaldus\pm5\engr\manuals\stomper\56318\rev d\fuel chart.doc
OIL FILL PLUG & SIGHT GAUGE

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3.3.7 Air Cleaner
Engine life will be extended by maintaining clean engine air filters. Remove and clean the air filter
elements daily,or more frequently under dustier job conditions. Wash the pre-filter element clean in a
non-oily cleaning solvent such a "Solvesol". Let the filter dry before reinstalling it in the air cleaner.
Replace air cleaner element every 100 hours.(More frequently in dusty areas).
3.4 TO START MACHINE
1. Check fuel tank, oil tank, air cleaner and Stomper lubrication as previously instructed.
2. Open the fuel valve/shut-off switch on the lower right hand side of the engine and the air vent
thumbscrew in the tank fill cap.
3. Raise throttle lever about halfway and apply the choke.
NOTE: A warm engine may not require choking.
4. Pull the starter briskly once or twice to prime the engine, then open choke slightly to prevent
flooding and continue cranking as necessary to start.
5. When engine starts, set choke in the open or run position. Let the engine run at idle to warm up,
then open up to full throttle for operation.
3.5 TO STOP MACHINE
1. Throttle engine down.
2. Close the fuel valve/shut-off switch and tank cap vent.
3.6 OPERATION OF MACHINE
WHEN OPERATING THE STOMPER, KEEP FEET CLEAR FROM THE RAMMING
SHOE. SERIOUS PERSONAL INJURY MAY OCCUR. WHEN OPERATING THE
STOMPER, HEARING PROTECTION SHOULD BE WORN. HEARING LOSS
MAY RESULT FROM PROLONGED EXPOSURE TO NOISE.
CAUTION: Never operate on hard,unyielding surfaces. Unwarranteed damage may result.
CAUTION: Alwaysuseboth hands when operatingthis machine. Thiswill ensure safemachineoperation.
1. In operation, guide the machine but let the machine do the work. Bearing down on the handle is
unnecessary and limits the shoe jump.
2. On nearlylevelsurfaces,the machinemovesforward in rapid jumps. Onunevensurfacesorinclines,
rocking the handle slightly may assist the Stomper in moving forward.
3. Always guide the Stomper so that the whole shoe, and not just the front or back edge, does the
impacting.
4. As the soil becomes compacted, the jump height of the Stomper will increase.
5. After a brief experience, you will know how to adapt the technique to the job conditions.
WARNING

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ROUTINE MAINTENANCE
3.7 THROTTLE CONTROL CABLEADJUSTMENT
1. Loosenthrottle cable clamp
screw.
2. Push throttle handle all the
way to the right.
3. Push down on high RPM
throttle paddle until it rests on
thehighRPMadjustment
screwand tighten throttle
cable clamp screw.
4. Runmachine and check
engineRPMwith a tachometer
to see if it is running to
specifiedRPM.
3.8 SETTING HIGH RPM
(Operating Speed)
1. Loosen throttle control cable clamp screw and high RPM adjustment screw locking nut.
2. Turn high RPM adjustment screw counterclockwise to increase RPM or clockwise to decrease RPM,
then tighten high RPM adjustment screw locking nut.
3. Push throttle handle all the way to the right.
4. Push down on the high RPM throttle paddle until is rests on the high RPM adjustment screw and
tightenthe throttle cableclamp screw.
5. Run machine and check engine RPM with a tachometer.
If engine is still not running to specified RPM, repeat above steps until recommended RPM is obtained.
3.9 THROTTLE HANDLE ADJUSTMENT
1. Retighten pivot bolt tight enough as to not allow throttle handle to move forward when machine
is operating
3.10 IDLE SETTING
If the engine idles smoothly but at too high RPM, turn the idle stop screw counterclockwise a little at a
time until the desired specification is obtained. To increase the idle speed,turn the idle stop screw
slowly clockwise until the desired RPM is obtained. The idle stop screw is the black screw located
behind the air cleaner base plate.