O.S. Engines 21XM - Manual (Page 5)

FITTING THE GLOWPLUG
The O.S. MAX-21XM is a high-performance
water-cooled outboard marine engine for small
and medium-size radio-controlled outboard
boats. It is of sturdy construction and designed
for easy maintenance. It is not necessary to
readjust the linkage when the installation angle
to the hull is changed.
A tilt mount is supplied as standard. Also, a
carbon-fibre propeller is included.
This engine rotates clockwise. Do not force it to
turn counter-clockwise.
With this engine, the piston will feel tight at the
top of its stroke when the engine is cold. This is
normal. The piston and cylinder are designed to
achieve a perfect running clearance when they
reach their normal running temperatures.
We do not recommend running your boat on the
sea, or in any other saltwater environment.
Under such conditions, it is difficult to prevent
the engine from becoming corroded and,
eventually, inoperative.
Fit washer to glowplug and insert
carefully into cylinder-head, making
sure that it is not cross-threaded before
tightening firmly.
INSTALLATION OF THE CARBURETTOR
As delivered, this engine has its carburettor lightly fitted into
its intake boss. Secure it as follows.
Loosen the retainer screw and rotate the carburettor to its
proper position in the intake boss.
The carburettor is aligned vertically and sealed against air
leaks by a heatproof rubber gasket between the
carburettor body and the rim of the intake boss. Therefore,
press the carburettor firmly down into the intake boss while
rotating the retainer screw.
Turn the screw gently until it stops, then tighten a further
90˚.
NOTE
1.
2.
Note:
The two-piece retainer is designed to pinch the carburettor
from both sides. Do not overtighten.
Washer
Glow plug
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