Instruction manual

22 FG-30/FG-36 STARTING THE ENGINE
FG-30/FG-36 ADJUSTMENT OF THE CARBURETOR 23
restart the engine with the throttle at a
fast idle position.
If the engine still will not start, unscrew •
the spark plug and check
its contacts. Clean any possible
excessfuel(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 above.
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, re-open 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 breakin prior to the first flight.
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 highest rpm with the high-speed
needlevalveandthenperformingidling(low
speedrpms)withthethrottlevalveandthe
low-speedneedlevalve.(Unlesspeakrpmis
achieved, idling adjustment will be difficult to
adjustandwillnotbestable.)
After filling the tank, start the engine and •
move the throttle to the fully open position.
Turn the main needle valve screw •
clockwise(refertoFigure5,page7)with
thecarburetoradjustmentbar(providedin
theaccessoriespackage)orasmallscrew
driver, and adjust to achieve peak rpm.
Use a tachometer to verify rpm.
CAUTION: Over-closing the main needle
valve is very dangerous and could cause
injury because it may cause knocking and
preignition. It may also cause the propeller
nut to loosen. Immediately turn the main
needle counterclockwise to richen up the
setting.
Next, close the throttle valve until the •
engine operates stably and with an idle
rpm of around 1,700 rpm. Do this by
adjusting the low-speed needle valve
withthecarburetoradjustmentbar(or
smallscrewdriver)andmanipulatingthe
throttle valve via the throttle stick on the
transmitter.
After reaching the stable 1,700 rpm, •
slowly open the throttle fully. If the rpms
become slow or go up suddenly, adjust
carefully until the changes are smooth
from idle to peak rpm, by adjusting the
low-speed needle valve.
After the previous steps have been •
accomplished, repeat the process from
idle to high rpm quickly. If the rpms do
not reach peak, but stutter as the throttle
moves from low to high, re-tune the main
needle valve and perform the process
from idling to peak quickly.
Repeat the process until the response is a •
smooth transition from idle to peak rpm.
Factory settings for the main and low-•
speed needle valves are as follows.
• Main needle valve: Turn needle valve all
the way clockwise and then back out 2
turns and 15 minutes.
Idle needle valve: • With the throttle barrel
closed, turn the needle valve all the way
clockwise and then back out 4 turns and
15 minutes.