ROTOmotor ROTO 35 FS User manual

TOP FOUR STROKE ENGINES
ROTO 35 FS
OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:2
CONTENTS
VERSION 2.6/ENG
Please check the updates of the operating instructions on the website www.rotomotor.cz so that your engine always has the best care.
1. Introduction ................................................. 3
2. Safety instructions .......................................... 3
3. Package contents .......................................... 4
4. Mounting ..................................................... 5
4.1. Mounting of the carburetor ........................... 5
4.2 Waste output ........................................... 5
4.3 Exhaust pipes .......................................... 6
4.4 The engine mount ...................................... 6
4.5 Propeller installation .................................... 7
5. Ignition ...................................................... 10
5.1 Ignition installation .................................... 10
5.2 Ignition power supply .................................. 10
6. Engine lubrication ...........................................11
7. Settings ..................................................... 12
7.1 The valves adjustment ................................. 12
7.2 Carburetor settings .................................... 14
8. Starting the engine ......................................... 15
9. Spare parts .................................................. 16
10. Accessories ................................................. 17
11. Warranty card ............................................... 18
12. Contact / technical support

Introduction
You have purchased a new four-stroke single cylinder petrol engine that requires the rst
few important steps to successfully start your RC plane model .
The engine has already been tested and started by the manufacturer, everything is ne and
it works as it should!
The engine is basically adjusted and tested with a 20/10 propeller tting and ROTO FS
exhausts.
• Always be very careful when handling the engine.
• The engine can start even when the propeller rotates very slowly and injure you!
• Whenever you start the engine, make sure that you have the model secured so that
there is no movement of the model and possible injury!
• Do not drive the plane with the engine running in between spectators and colleagues
at the airport!
• Do not touch the engine after the ight, it is hot and there is a risk of burns!
• You have one body, take care of it and enjoy ROTO engines.
1.
Safety instructions2.
Thank yOu FOR chOOSing OuR pROducT
FOuR-STROke engine
pROduced in The czech Republic.
ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:3
ADVICE WARNING

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:4
Please follow the instructions carefully.
Check that all the listed parts are in the box.
Standard package contents:
1. ROTO 35 FS................................. 1 x
2. Ignition ROTO 35 FS........................ 1 x
3. Waste oil hose ............................. 1 x
4. Spark plug key CM6 ........................ 1 x
5. Engine mounting .......................... 1 x
6. Cable ties ..................................2 x
7. Silicone tube ............................... 1 x
Package contents3.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:5
Mounting
4.1 Mounting of the carburetor
4.
After unpacking the engine must be completed according to the following instructions:
We screw the complete intake, including the carbu-
rettor, onto the engine using two M4 screws.
Do not forget the enclosed gasket which you insert
between the intake ange and the cylinder head.
Air intake is mounted on the carburettor, to which
we must ensure a sucient air supply for the
correct operation of the engine, do not cover it!
It is necessary to connect a hose with fuel supply to the carburettor. A protective plug is atta-
ched to the carburettor fuel tting due to dirt during transport. This plug must be removed
and the gas supply from the model‘s tank connected in its place.
When removing the engine from the model for a longer pe-
riod of time, it is necessary to replace the protective plug
to prevent the fuel in the carburetor from drying out.
Do not remove the air intake, do not modify it!
It‘s part of the engine, and the correct operation
of the engine depends on it.
The image is for illustration purposes only

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:6
After completing the installation of the carburetor, we can proceed to connect the waste output.
4.2 Waste output
It is necessary to drain a very small amount of unburned oil from the engine, which is used
to lubricate the crankcase. The nozzle, which is located on the engine block, is used for this
purpose. A cap is attached to this nozzle, which must be removed and replaced with a waste
oil hose, which will drain the oil out of the model.
We recommend leading the waste oil hose to the landing gear.
Waste output is very important and must never be blocked.
In any case do not reduce the diameter of the hose, or it will damage the engine.
If the waste output was clogged, the motor will be damaged.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
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4.3 Exhaust pipes
The third part that needs to be mounted is the exhaust pipe
The exhaust pipes are made so that they can be rotated around the axis. Therefore, set the
exhaust pipes to the desired position by turning and then secure by tightening the nut.
Beware of damage to the end of the pipe!
The end of the pipe serves as a sealing surface
for the extension tube. If damaged, it will not be
possible to seal the pipes correctly!
The diameter of the exhaust
pipe cannot be reduced!
ROTO extension pipe and exhaust not included!
There should be no more than 2mm
between the end of the exhaust pipe
and the exhaust.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:8
4.4 The engine mount
4.5 Propeller installation
It is very important to mount the propeller correctly. 4 strength screws are used for this
purpose. Tighten them evenly! The propeller must be regularly checked and tightened,
especially when using a new wooden propeller.
For mounting the engine inside the model airplane,we recommend using
5mm high strength steel bolts, large at washers and lock nuts.
1:4
Mounting the engine bulkhead check
occasionally to prevent loosening.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:9
Direction of rotation of the propeller / Engine
Check the tightening of the propeller often, especially at beginning, when the
propeller is new!
Loose screws will cause the screws cuts to, exposing you to the risk of injury
as well as damage to your model. This danger is mainly posed by the use of a
wooden propeller.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:10
Ignition5.
5.1 Ignition installation
Never remove the Hall sensors from the backplate.
5.2 Ignition power supply
The recommended power supply for ignition is 4-9V.
Always charge the batteries before ying.
Do not rely on charging from the last ight!
Ignition installation is an integral part of installing an engine in an aircraft.
Place the ignition in a suitable place where there is no risk of excessive heat from the
cylinder heads or the exhaust system.
If the ignition is heated above 60 °C, the ignition will switched off and the engine stops
working.
Make sure that the ignition is
well and suciently cooled!
Make sure that the connectors are
tted correctly and that there is no
risk of loosening them!
Do not bend the HV cables into sharp
bends, they may be interrupted!
Install the spark plug cup from the ignition to the spark plugs.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:11
Engine lubrication is provided by adding oil to gasoline in a ratio of 1:50.
For easier application, use this table:
Fuel Oil
L ml
1 20
2 40
3 60
4 80
5 100
6 120
Use gasoline 95 - 98 okt.
+
Failure to follow the recommended oil types will void your warranty.
! DANGER OF ENGINE DAMAGE!
Information about our network of dealers at [e-mail]
Engine lubrication
Fuel Oil
gal oz
1 2.56
25.12
37.68
4 10.24
5 12.8
6 15.36
Metric system Imperial system
STIHL HP Ultra oil /1:50
6.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:12
Settings
If you have no experience with this type of engine adjustment:
1. Pack the engine and send it for adjustment to your specialist garage,
where the engine will be adjusted for you.
2. Ask by email at the manufacturer at [e-mail]
7.
7.1 The valves adjustment
For the operation and long-term operation of the engine, the correct valve clearance must be
checked after the rst 2-3 hours of operation.
Follow these steps to check and adjust:
Unscrew the rocker arm cover bolts on the cylinder heads and then remove the rocker arm
covers. Adjust the piston to the top dead center so that the mark on the propeller hub is in
alignment with the crankcase dividing plane of the engine on the top of the engine.
Then start adjusting the clearances on the side where the valves are not cut shear! This means
where there is a slight clearance on both rockers.
Valves adjustment:
Loosen the lock nut with a wrench and turn the screw. Set the required clearance with the help
of a feeler gauge.
Then tighten the lock nut to 2.4NM
Then complete the engine.
Rotates counterclockwise
Now the rocker arm clearance is adjusted. Future adjustments are only necessary
when disassembling certain important parts.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:13
Adjusting the cylinder head
E S
2
4
If you have no experience with this type of engine adjustment:
1. Pack the engine and send it for adjustment to your specialist garage, where
the engine will be adjusted for you.
2. Ask the manufacturer by email at [e-mail]
3
1
Tightening torque
Spark plug..............................................20 Nm
Rocker arm cover................................ 2,2 Nm
Rocker arm ..............................................2 Nm
Cylinder head..........................................5 Nm
Valves adjustment
Suction valve .................................. 0,1 mm
Exhaust Valve ................................ 0,2 mm
1
2
3
4
S
E

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:14
7.2 Carburetor settings
H needle
L needle
Stop screw
The carburetor is factory adjusted and should NOT need an adjustment before a rst ight.
Should you wish to adjust the carburetor after the Run-in period and ne tune it to the prop
of your choice, please use the following procedure.
Set the High needle „ H „ for the highest RPM. After you are satised with High-end, adjust
the Low „ L „ needle for smooth transition between High and Low range with out any hesi-
tation.
Adjusting servo / idle
The idle speed is set to 1200 ± 200 RPM by the deection at the servo.
Then you can remove the stop screw.
How do we know that the engine is set correctly?
With the propeller 20/10 the engine achieves - 5700 ± 200 RPM. When properly adjusted, the
engine continuously accelerates from idle speed to maximum. The idle speed with a 20/10
propeller is 1,200 ± 200 RPM
These gures may dier when using a dierent propeller.
The motor has been adjusted on the bench. Must be loosen the
stop screw to avoid damaging the servo.
ROTO recommends removing Stop Screw and idle rpm keep by your TX

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:15
Starting the engine8.
Always check that the ignition is off
We will perform a cold start according to the following instructions:
After ying, do not run out remaining fuel from the aircraft tank.
System will be vented and the engine will start incorrectly.
Switch on the carburettor choke and, if possible, at the same time plug the carburettor intake
with your nger so that the engine intake effect is maximized. Rotate the propeller about ten
times and then release the carburettor intake, turn off the choke valve, turn on the ignition and
start the engine without the choke. We will only use this when the fuel is rst drawn from the
tank into the carburetor.
Allow the engine to warm up to operating temperature and run the engine for 15-20 minutes
with occasional throttle.
Then ne-tune the carburetor to the exhaust system used and propellers. Use the needle mar-
ked „H“ to ne-tune the maximum engine power and the second needle with mark „L“ to adjust
the engine transitions to maximum speed.
The idle speed is set by the throttle servo on the transmitter.
For warm engine starts it is good to use a starting system without a choke
Remember to check the correct function of the on-board system before each
start by testing the range of the transmitter.
The rst way to start:

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:16
Spare parts
03-0019N .............................................Tappet rod
03-0041 ..............................................Propeller hub + magnet
03-0043 ..............................................Prop washer
03-0045 ..............................................Engine mounting
03-0144 ..............................................Carburetor insulator
03-0180 ..............................................Air intake - long
03-0252 ..............................................Exhaust pipe
03-0253 ..............................................Mainfold (side)
03-0253B .............................................Mainfold (back)
03-0547 ..............................................Propeller center bolt
08-0005 ..............................................Ignition system
9.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:17
03-0589 ..............................................Connector FS 200mm
03-0596 ..............................................Connector FS 300mm
03-0620 ..............................................Muer ROTO STANDARD FS
06-0041 ..............................................Propeller drill jig
N0011 .................................................Spark plug CM6
N0017 .................................................Piston ring
N0025L ...............................................Carburetor
Accessories
For more info visit www.rotomotor.cz
03-0387 ..............................................Complete gasket set
10.
• Push rod tube O-ring ............ 2x
• Rear cover O-ring................ 1x
• Carburetor gasket ............... 2x
• Rocker cover gasket ............. 1x
• Timing cover seal ................ 2x
• Cylinder gasket .................. 1x
• Suction gasket .................. 1x
• Cylinder head gasket ............ 1x
Connector FS 200 & 300
Muer STANDARD FS
Propeller drill jig

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:18
Warranty card
Name of a product:
Type:
Serial number:
Date of purchase:
Dealer’s name, address:
Stamp:
11.

ROTOmotor Ltd., Czech Republic - Europe Operating instructions ROTO 35 FS ROTOmotor Ltd., Czech Republic - Europe
ROTOmotor manufacturer of top four-stroke engines Page:19
This product has been tested, inspected and inspected for sale for 24 months
from the date of sale.
The warranty covers defects that occurred during the warranty period due to an
error in the production or materials used.
In the event of a defect, please report the product together with the sales docu-
ment and this, completed and conrmed, warranty card either to the seller or send
the product to the manufacturer.
Attach a description of the defect or how it occurred to the warranty claim.
The right to a free warranty repair expires in the following cases:
►the warranty does not cover defects caused by incorrect installation (eg incorrect
installation, insucient cooling, etc.)
►if the data on the warranty card and sales document dier
►the product has been used for purposes other than those for which it was intended.
►the warranty does not cover normal wear and tear or unauthorized intervention
►damage caused by dirt or when electronic or otherwise sensitive parts of the engine
come into contact with water or chemicals (eg paint, cleaning agents, etc.)
►with regard to a defect caused by mechanical damage to the product (eg model
accident, engine disassembly, etc.)
In the event of an unjustied complaint, the customer will be charged for all costs
associated with this complaint, including any repairs.
The costs associated with the transport of goods to the service are borne by the
customer
The costs associated with the transport of repaired goods under warranty are borne by
the manufacturer. Warranty repairs are performed only by the manufacturer
ROTOmotor accepts no liability for injuries, damage to health or property, when using the en-
gine in violation of the operating instructions manual, the use of common safety principles for
the use of the combustion engine and its accessories.

Developed in the
Czech Republic
ROTO engines Ltd.
Zbecnik 259
Hronov 549 31
Czech Republic
FOllOw uS On SOcial media
[e-mail]
[phone]
www.romotor.cz