Saito FG-36 Owner's Manual - page 6
A D J U S T M E N T O F T h E C A R B U R E T O R
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8
S T A R T I N g T h E E N g I N E
a. Turn on the transmitter first, then the
receiver and check the operation of the
throttle servo and other controls.
b. Turn on power to the ignition
system.
c. Using an electric starter, begin
cranking the engine. It should fire
within seconds of applying the starter.
Allow the engine to idle for 30 to 45
seconds.
d. If the engine does not start, even
after using the electric starter to crank
the engine a second time, open the
throttle to maximum, turn off the
ignition and turn the engine over about
4 revolutions. Switch the ignition on
again and then restart the engine with
the throttle at a fast idle position.
e. If the engine still will not start,
unscrew the spark plug and check its
contacts. Clean any possible excess
fuel (i.e. an indication of engine
flooding) and screw it in again. Further
starting should only be done with the
throttle at idle position. If the plug
is dry, probably not enough fuel has
been drawn into the carburetor. If
that is the case, check the fuel feed
and then return to the instructions in
paragraph a.
Note:
We strongly urge the use of a
tachometer to check rpm readings
when breaking in the engine.
After starting and warming the engine
for 30 to 45 seconds adjust as follows:
For initial break in:
Do not exceed 4,000 rpm for the first
10 minutes of operation. This allows
all the parts to mate properly with
good lubrication.
Step I. Move the throttle to 2/3
high throttle position quickly (fast
acceleration). Repeat three times. If
the engine accelerates smoothly go to
Step III. If acceleration is not smooth,
go to Step II.
Step II. Faulty acceleration and a
tendency to quit is usually attributable
to a poor fuel mixture in the medium
rpm range. Stop the engine and
recheck the fuel feed (The fuel line
must not be pinched or broken).
Restart the engine and test acceleration
again. If the problem persists adjust
the carburetor. Open the low speed
needle by 5 minutes and retest. If
acceleration is smooth, open the
needle by another 3 to 5 minutes. This
should be done because the needle was
previously set too lean. If the engine
continues to not accelerate properly,
open the low-speed needle by 10
minutes. If the engine’s operation does
not improve, shut it off and check the
basic setting, restart the engine and
test the acceleration. If the engine
continues to not accelerate properly,
the defect is likely to lie somewhere
other than an adjustment. If the engine
runs correctly, go to Step III.
Step III. If the engine accelerates
correctly, set it at idle speed and
accelerate to full speed. Repeat twice
more. If the engine functions correctly,
go to Step IV. If it cuts out, open the
low-speed needle valve by 5 to 10
minutes more. If the engine does not
respond to acceleration fast enough,
keep closing the low-speed needle
until the engine starts to cut out in
response to throttle opening. At that
point, reopen the low speed needle by
5 to 10 minutes.
Step IV. If the engine reacts correctly,
set it at full speed. If the revolutions do
not drop, the engine has been adjusted
successfully. If the revolutions seem to
drop, open the high-speed needle by
about 5 to 10 minutes.
CAUTION:
The engine must
be stopped while you adjust the
carburetor in order to prevent injury
by the propeller. Subsequent runs may
be made while slightly leaning out the
mixture with each tank full of fuel.
Forty minutes is considered sufficient
time for normal break in prior to the
first flight.
The use of a tachometer is encouraged
for setting the high-speed needle valve
prior to flight. The peak rpm should be
obtained and then reduced by 200 to
300 rpm. Over-revving of a 4-stroke
engine can cause internal damage to
the engine.
Adjustment of the
Carburetor
The low-speed needle valve is set at
the factory so that idle rpm may be
between 1,800 and 2,100 rpm.
In principle, a carburetor is adjusted
by first achieving peak rpm (highest