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Engine Maintenance - Saito FG-57T Instruction Manual

Twin-cylinder gasoline four-stroke engine.
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compound before attaching the
two parts together. This will help
to keep these parts tight and help
prevent any leakage from occurring.
6. The propeller nut and the exhaust
locking nuts should be tightened
when the engine is hot.

Engine Maintenance

NOTICE: DO NOT NEEDLESSLY
DISASSEMBLE YOUR SAITO
ENGINE. ONLY QUALIFIED
INDIVIDUALS SHOULD PERFORM
ENGINE REPAIRS. DAMAGE DUE
TO IMPROPER DISASSEMBLY
WILL NOT BE COVERED UNDER
WARRANTY.
If it becomes necessary to dismantle
your Saito engine, the following
procedure should be followed:
It's important to maintain identif-
ication of the "left"and"right"
cylinder parts when dismantling and
reassembling the engine. Looking
forward from the rear of the engine
with the engine upright, the cylinder
on the right side is the right cylinder.
Therefore, the cylinder to
the left is, of course, the left cylinder.
E N G I N E M A I N T E N A N C E
Adjustment of the
Tappet Gap
1. Once the break-in on the ground is
completed, you should adjust the
tappet/valve gap for the first time.
After the initial adjustment, inspect
the tappets at least after every 10
hours of operation and check for
the proper gap. Your experience
may cause you to do this more
frequently.
2. Adjustment of the tappet is done
when the engine is cold.
3. Remove the spark plugs and the
rocker covers from the engine.
4. Rotate the propeller slowly in the
normal direction of rotation. Once
you see the intake valve open and
close, rotate the propeller another
180 degrees and you should be at
the compression top dead center.
5. In that position loosen the tappet
locking nut and adjust the clearance
to virtually zero. (You should not
be able to insert the included feeler
gauge between the tappet and the
valve.)
6. After the gap is checked tighten the
locking nut firmly but do not over-
tighten.
Note. In normal maintenance of
full-size four-stroke engines, a little
clearance between the tappets and the
pushrods/camshaft is allowed because
of the assumed expansion of the valve.
Saito engines are different because
of the aluminum construction. The
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