O.S. engine FS-70 Ultimate Owner's Instruction Manual page 3

Take care that the glow plug clip or battery leads do not come into contact with the propeller.
Also check the linkage to the throttle arm. A disconnected linkage could also foul the propeller.
After starting the engine, carry out any needle-valve readjustments from a safe position behind the rotating
propeller. Stop the engine before attempting to make other adjustments to the carburetor.
Adjust the throttle linkage so that the engine stops when the throttle stick and trim lever on the transmitter are fully
retarded. Alternatively, the engine may be stopped by cutting off the fuel supply. Never try to stop the engine
physically.
Take care that loose clothing (ties, shirt sleeves, scarves, etc.) do not come into contact with the propeller.
Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt pocket from where they could fall through
the propeller arc.
Do not start your engine in an area containing loose gravel or sand. The propeller may throw such material in your
face and eyes and cause injury.
For their safety, keep all onlookers (especially small children) well back (at least 20 feet or 6 meters) when preparing
your model for flight. If you have to carry the model to the take-off point with the engine running, be especially
cautious. Keep the propeller pointed away from you and walk well clear of spectators.
Warning! Immediately after a glowplug-ignition engine has been run and is still warm, conditions sometimes exist
whereby it is just possible for the engine to abruptly restart if the propeller is casually flipped over compression
WITHOUT the glowplug battery being reconnected. Remember this if you wish to avoid the risk of a painfully rapped
knuckle!
INTRODUCTION
The FS-70 ULTIMATE comes equipped with the new O.S. FS-
70U diaphragm type fuel pump and matching Type 60U carbur-
etor incorporating a built-in pressure regulator. These features
ensure that fuel/air mixture strength is maintained at a constant
level through maneuvers, for consistent performance and reli-
able throttle response.
In the interests of improved durability, certain ferrous parts that
are particularly susceptible to corrosion in four-stroke engines,
have a corrosion resistant plating and, for the same reason, a
special grease-packed twin-sealed rear ball-bearing is used.
To maintain the four-stroke engine's reduced noise levels, the
FS-70 ULTIMATE is supplied with an O.S. Type F-4020 baffled
silencer (muffler) of substantially enlarged volume, as standard
equipment.
Where installation calls for a separate exhaust pipe, these parts
are available as optional extras.
INSTALLING THE GLOW PLUG
Carefully insert plug, with washer,
fingertight only, before final tightening
with the correct size plug wrench.
4
Carburetor
Type 60U
Glow plug
Washer
5
Rocker Cover
Glow plug Type F
Intake Pipe
Pump Unit (FS-70U)
Cylinder Head
Push Rod Cover
Lock Nut
Propeller Nut
Crankshaft
Propeller Washer
Drive Hub
Crankcase
Beam Mount