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Saito FG-57T Instruction Manual Page 8

Twin-cylinder gasoline four-stroke engine.
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6
P R E P A R I N G Y O U R E N G I N E
Preparing your engine
The first run on any engine, whether
2-cycle or 4-cycle, is critical to the
future of the engine itself. During this
time, metal mating parts (piston and
cylinder, ball bearings, etc.) settle in.
Care must be taken that the engine is
clean and free of any dust or grit that
may have accumulated while building
the model.
There are two accepted methods for
breaking in a new engine: test stand
mounted and run or aircraft mounted
and run. Either method is acceptable;
however, mounting the engine to a test
stand allows the engine to be observed
throughout its operation, as well as
elevating it above the ground and away
from harmful dust and dirt.
Note: Because your engine may have
been sitting for an extended period of
time prior to running it, a few drops of
light oil applied through the crankcase
breather nipple (19 on the exploded
view) and down the push-rod tubes
(40) will ensure proper lubrication for
the first run.
Regardless of the mounting method
chosen for break-in, the following
procedures are applicable:
1. Use a break-in fuel as described in
the"Support Equipment" (20:1 -
gasoline:oil ratio).
2. Use the proper spark plugs. Your
engine includes the NGK CM-6
spark plugs (SAIG36120).
3. Check whether you can completely
open and close the throttle barrel. If
it cannot be completely closed you
will have a hard time drawing fuel
to the carburetor for a manual start.
4. Check to make sure the ignition
system wiring is connected
correctly.
5. Use a 14 –17 oz (400-500cc) fuel
tank for your test bench. Use the
installed tank if breaking in mounted
to an airframe.
6. Use a 22 x 10 propeller for break-in.
We prefer a carbon propeller such
as a Mejzlik. Since this engine can
easily be started manually, position
the propeller with the blades at
about 1:30 and 7:30 position (when
viewed from the front) as the engine
comes up against compression. This
will be a good position to allow a
quick and strong flip of the prop
when starting.
If starting with an electric start
motor, also add a spinner nut
or cone to the propeller/engine
assembly.
CAUTION: The safest way to
start the engine is with an electric
starter.

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