O.S. Engines FS-52S - Manual (Page 13)

FUEL AND PRESSURE LINES
Fuel level
Muffler to tank pressure line
Connect suitable lengths of silicone tubing, as
illustrated, after installing the engine.
Attention to tank height
Note: When cutting silicone tubing···
Locate the fuel tank so the top of the tank is
5-10mm(1/4-3/8") above the level of theneedle-valve. 5-10mm
Silicone tubing
Use knife or razor blade
Do not use wire cutters
or pliers.
*If you should need to clean out silicone tubes, use methanol
or glow-fuel, not gasoline or kerosene.
PROPELLER & SPINNER ATTACHMENT
Fit the prop to the engine shaft, followed by the
retaining washer and prop nut and tighten firmly
with a 14mm wrench.
Add the special tapered and slotted locknut and
secure with a 12mm wrench while holding the
prop nut with the 14mm wrench.
There is a risk, particularly with powerful four-stroke
engines, of the propeller flying off if the prop nut
loosens due to detonation ("knocking") in the
combustion chamber when the engine is operated
too lean, or under an excessively heavy load.
Obviously, this can be very hazardous. To eliminate
such dangers, the O.S. Safety Locknut Assembly was
devised. Fit this as follows:
Lock Nut
Propeller Washer
Propeller Nut
1.
2.
12