Briggs & Stratton 950 Series Operating and installation instructions

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Copyright © Briggs & Stratton Corporation Page 1 of 13
All language translations of this document are
derived from the original English source file.
ADVANCE PRODUCT SERVICE INFORMATION
APSI NO: 101
DATE: AUGUST 2014
SUBJECT: 950 SERIES™ UTILITY ENGINE
MODELS: 130G00 OHV HORIZONTAL SHAFT
This APSI provides basic servicing information in advance of the repair manual under development. Systems
testing, troubleshooting, and component removal and installation procedures are common with most other
single-cylinder horizontal-shaft OHV engines. See the Illustrated Parts List for service part numbers. The
specifications, part numbers, and procedures provided here are preliminary and subject to change.
MODEL IDENTIFICATION LOCATION
The Model-Type-Trim and Code numbers (A) are printed or etched into the edge of the cylinder base below
the fuel tank. The bar code serial number label (B) is attached to the side of the fuel tank.
A
B

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OVERALL ENGINE DIMENSIONS (Millimeters)

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GOVERNOR SHAFT INSTALLATION
There is a washer (A) that must be fitted to the governor shaft before installation into the cylinder. Secure the
governor shaft from the outside with the retaining clip. The straight leg of the clip fits into the groove (B) of
the governor shaft.
OPTIONAL LOW-OIL SENSOR INSTALLATION
The low-oil sensor installs inside the cylinder with two screws (C). Tighten the screws to 60 lb-in (6.8 Nm).
Next, route the sensor harness (D) through the opening in the cylinder. Secure the harness from the outside
with the hex nut and tighten to 40 lb-in (4.5 Nm). Also see Low-Oil Module Installation.
PISTON ASSEMBLY
When installing the oil ring expander, ensure that the ends at the expander gap (E) point up toward the piston
crown. The lettering on the center and top piston rings must also face up toward the crown. When installing
the piston assembly into the bore, the notch in the piston (F) and the oil dipper on the connecting rod (G) will
face down toward the push rods.
C
B
A
D
E

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CRANKCASE COVER INSTALLATION
1) Make sure the mating surfaces on the cover and the cylinder are clean and dry.
2) Install the new gasket over the dowel pins, then carefully install the cover over the crankshaft and
press into place.
3) Start the cover screws by hand and then step-torque in the sequence shown below to 220 lb-in (24.9
Nm).
F
G
1
2
3
4
5
6

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CYLINDER HEAD ASSEMBLY AND INSTALLATION
1) Install the valves, then turn the head over to install the stem seal on the intake valve. Note that the
flat end of the seal faces the head.
2) Install the valve springs and retainers.
3) Position the head plate (H) with tangs facing down (inset). Install the two studs (I) and tighten them to
125 lb-in (14.1 Nm).
4) Place the head gasket on the cylinder. Ensure the breather hole in the gasket aligns with the
breather hole in the cylinder.
5) Install the head assembly to the cylinder with four screws. Tighten the screws to 210 lb-in ( 23.7 Nm)
in the sequence shown.
6) Install the push rods and the valve stem caps.
7) Install the rocker arms and the rocker ball nuts. After setting the valve clearance (see Common
Specifications chart below), tighten the rocker ball nuts to 70 lb-in (7.9 Nm).
8) Place the cover gasket inside the valve cover and fit the cover over the cylinder head. Install four
screws and tighten to 80 lb-in (9.0 Nm) in the same sequence as the head screws.
H
I
1
2
3
4

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STATOR INSTALLATION
If the engine is equipped with a stator assembly, install it as follows:
1) Position the stator with the wires to the top and facing the cylinder. Feed the wires through the upper
hole in the cylinder (J) and install the two screws (K). Tighten the screws to 95 lb-in (10.7 Nm).
2) Pull the stator wires tightly through the cylinder hole, then route them between the ribs as shown
below. Press the wires down (arrows) to the cylinder as far as possible. The wires must not
interfere with the operation of the governor lever.
FLYWHEEL REMOVAL
After removing the flywheel nut, starter cup, and fan, install Flywheel Puller Tool #19203 to remove the
flywheel.
Note that early production flywheels do not have holes for the flywheel puller tool. Instead, a two-jaw puller
(below) can be installed to remove these flywheels. Briggs & Stratton does not currently provide this type of
tool.
J
K

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FLYWHEEL INSTALLATION
1) After installing the flywheel finger guard (L), thoroughly clean and dry the crankshaft taper. Place the
flywheel key in position in the crankshaft keyway.
2) Align the keyway in the flywheel (M) to the key in the crankshaft and press the flywheel into position.
3) Install the flywheel fan (N) and the starter cup (O) to the flywheel. The bosses on the fan and cup
must fit into the corresponding holes in the flywheel.
4) Start the flywheel nut (P) by hand, and then tighten to 65 lb-ft (88.1 Nm).
L
M
P
N
O

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LOW-OIL MODULE INSTALLATION
The low-oil module is available in either a standard 2-wire version or a lamp indicator 5-wire version. They
are discussed separately below.
Standard Module 2-Wire Installation
1) After connecting the wires, install the module (Q1) to the flywheel finger guard with screw. Tighten
the screw to 55 lb-in (6.2 Nm).
2) Route the module ground wire through the clip (Q2) on the finger guard and between the ribs (Q3) in
the top of the cylinder. Pull the wire tightly, and then press it down to the cylinder as far as possible.
The wire must not interfere with the operation of the governor lever.
3) Route the wire beneath the blower housing mounting boss (Q4).
4) Attach the rocker switch ground wire under the control bracket mounting screw (Q5). Complete the
connections to the rocker switch as shown below.
Q1
Q2
Q3Q4
Q5

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Lamp Indicator Module 5-Wire Installation
The wires and their associated circuits are shown below.
GRN = Ground
RED = Lamp Positive
YEL = Oil Sensor
BLK/WHT = Lamp Negative
BLK1 = Remote On/Off Switch
BLK2 = Ignition Coil
1) Connect the YEL wire to the oil sensor. Position the GRN wire terminal between the module and the
flywheel finger guard (R1), and then install the module (R2) to the finger guard with the screw.
Tighten the screw to 55 lb-in (6.2 Nm).
2) Connect the BLK1 wire to the remote on/off switch on the equipment, if equipped. Connect the BLK2
wire to the ignition coil. Make sure the wires are routed through the clip (R3) on the finger guard and
between the ribs (R4) in the top of the cylinder. Pull the wires tightly, and then press them down to
the cylinder as far as possible. The wires must not interfere with the operation of the governor lever.
3) Route the wires beneath the blower housing mounting boss (R5).
R2
R1
R3
GRN RED
YEL
BLK/WHT
BLK1BLK2
R4
R5

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4) If equipped, attach the rocker switch ground wire under the control bracket mounting screw (R6).
Complete the connections to the rocker switch as shown below.
STATIC / DYNAMIC GOVERNOR ADJUSTMENT PROCEDURE
IMPORTANT: The governor lever must be replaced any time the static governing is adjusted!
1) While holding throttle wide open, rotate the governor shaft clockwise until it stops.
2) Tighten the governor lever nut to 40 lb-in (4.5 Nm).
3) Hold the throttle against the idle stop screw on the carburetor. Adjust the screw as required to obtain
1450 RPM or 1750 RPM, depending on application.
4) Adjust the high speed screw on variable-speed engines or bend the spring anchor tab on fixed-speed
engines to obtain the equipment manufacturer’s Top No-Load speed (+/- 100 RPM).
Spring Color Hole Position Top No-Load Speed Range
Variable Speed
Blue 3 3400 - 3600
Blue 4 3700 - 3800
Blue 5 3900 - 4200
Red 3 3300
White 3 3000 - 3200
Green 3 2600 - 2900
Fixed Speed
Yellow 3 3200 - 3500
Yellow 4 3600 - 3900
Yellow 5 4000 - 4200
Black 3 2600
Black 4 2700 - 2800
Black 5 2900 - 3100
R6

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FUEL TANK INSTALLATION
When installing the fuel tank, the mounting screw adjacent to the control bracket must be installed first. Then
the hex nuts are installed on the opposite side of the tank.
Make sure the tangs of the fuel hose clamp (S) are pointing up after connecting the hose. Verify that the tank
installation does not interfere with the free movement of the governor lever, link, and springs (T).
COMMON SPECIFICATIONS AND SERVICE PARTS
Common Specifications SAE Metric
Armature Air Gap .010-.014 in .25-.35 mm
Oil Seal - Mag Side Recessed .050-.070 in Recessed 1.27-1.78 mm
Oil Seal - PTO Side Recessed .090-.110 in Recessed 2.28-2.79 mm
Bore x Stroke 2.756 in x 2.130 in 70.00 mm x 54.00 mm
Crankshaft End Play - Standard .003-.030 in .08-.76 mm
Crankshaft End Play - Pump Applications .002-.009 in .05-.23 mm
Displacement 12.69 ci 208 cc
Oil Capacity 18-20 oz. .54-.59 L
Sparkplug Gap .030 in .76 mm
Valve Clearance - Intake .004-.006 in .10-.15 mm
Valve Clearance - Exhaust .006-.008 in .15-.20 mm
Common Service Parts Part Number
Air Filter Element 590601
Air Filter Pre-cleaner 590602
Carburetor Overhaul Kit 591770
Engine Gasket Set 591565
High Altitude Jets 593359
Sparkplug 491055
Sparkplug Wrench 590721
Spark Tester 19368
ST

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FASTENER TORQUE SPECIFICATIONS
Fastener Torque Specs SAE Metric
Air Cleaner Base to Carburetor 40 lb-in 4.5 Nm
Air Cleaner Base to Control Bracket 50 lb-in 5.6 Nm
Alternator/Stator 95 lb-in 10.7 Nm
Armature 95 lb-in 10.7 Nm
Blower Housing 85 lb-in 9.6 Nm
Carburetor Stud to Cylinder Head 60 lb-in 6.8 Nm
Connecting Rod 125 lb-in 14.1 Nm
Control Bracket 95 lb-in 10.7 Nm
Crankcase Cover 220 lb-in 24.9 Nm
Cylinder Head 210 lb-in 23.7 Nm
Cylinder Head Plate Studs 125 lb-in 14.1 Nm
Cylinder Shield 50 lb-in 5.6 Nm
Exhaust Stud to Cylinder Head 50 lb-in 5.6 Nm
Exhaust Muffler 95 lb-in 10.7 Nm
Exhaust Muffler Guard 40 lb-in 4.5 Nm
Exhaust Muffler Deflector (Plate-style) 30 lb-in 3.4 Nm
Exhaust Muffler Deflector (Tube-style) 10 lb-in 1.1 Nm
Flywheel Finger Guard 85 lb-in 9.6 Nm
Flywheel Nut 65 lb-ft 88.1 Nm
Fuel Tank Screw 85 lb-in 9.6 Nm
Fuel Tank Nuts 100 lb-in 11.3 Nm
Governor Lever Nut 40 lb-in 4.5 Nm
Oil Drain Plug 170 lb-in 19.2 Nm
Oil Fill Tube to Crankcase Cover 30 lb-in 3.4 Nm
Oil Fill Tube to Trim Panel 10 lb-in 1.1 Nm
Oil Module (External) 55 lb-in 6.2 Nm
Oil Sensor (Internal) 60 lb-in 6.8 Nm
Oil Sensor Harness Nut 40 lb-in 4.5 Nm
Rewind Starter 30 lb-in 3.4 Nm
Rocker Ball Nuts 70 lb-in 7.9 Nm
Sparkplug 180 lb-in 20.3 Nm
Valve Cover 80 lb-in 9.0 Nm

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TECHNICAL DIMENSIONS
Dimensions Engineering Std Dims. Service Reject Dims.
SAE Metric SAE Metric
Cylinder
Mag Bearing Ball Ball n/a n/a
Cam Bearing .551 in 14.00 mm .552 in 14.02 mm
Bore Out-of-Round n/a n/a .0015 in .04 mm
Cylinder Head
Intake - Aluminum
Valve Seat Angle 45 degrees 45 degrees n/a n/a
Valve Stem Diameter .216 in 5.48 mm .214 in 5.43 mm
Valve Guide .217 in 5.50 mm .219 in 5.55 mm
Exhaust - Steel, Plated
Valve Seat Angle 45 degrees 45 degrees n/a n/a
Valve Stem Diameter .215 in 5.47 mm .213 in 5.42 mm
Valve Guide .217 in 5.50 mm .219 in 5.55 mm
Crankcase Cover/Sump
PTO Bearing Ball Ball n/a n/a
Cam Bearing .551 in 14.00 mm .552 in 14.02 mm
Crankshaft
Crankpin Journal 1.181 in 30.00 mm 1.179 in 29.95 mm
Mag Journal .984 in 25.00 mm .982 in 24.95 mm
PTO Journal .984 in 25.00 mm .982 in 24.95 mm
Cam Shaft
Mag-Side Journal .550 in 13.98 mm .549 in 13.95 mm
PTO-Side Journal .550 in 13.98 mm .549 in 13.95 mm
Connecting Rod
Crankpin Bearing 1.183 in 30.05 mm 1.185 in 30.10 mm
Piston Pin Bearing .709 in 18.01 mm .711 in 18.06 mm
Piston Pin
Diameter .708 in 17.99 mm .707 in 17.96 mm
Piston
Pin Bore .709 in 18.01 mm .711 in 18.06 mm
Piston Rings
End Gap - Top .010 in .25 mm .020 in .50 mm
End Gap - Middle .014 in .35 mm .028 in .70 mm
End Gap - Oil .020 in .50 mm .040 in 1.00 mm
Ring Land Clearance - Top .002 in .05 mm .005 in .13 mm
Ring Land Clearance - Middle .002 in .05 mm .005 in .13 mm
Ring Land Clearance - Oil .002 in .05 mm .005 in .13 mm
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