Stopping the Engine
Release throttle, press ignition kill switch. As an emergency procedure, if any failure with
the ignition kill switch or wiring, close the air inlet of the air box with your hand and engine
will stop quick. Caution! - well take care of the propeller.
Adjustment of the Carburetor
As mentioned before the carburetor is pre-adjusted when engine is delivered but in every
different location the carburetor may need some small re-adjustment so that the engine
runs properly at idle and at low RPM operations. For these adjustments we have two
adjuster screws on the carburetor (see picture).
idle adjuster screw
low jet adjuster screw
Idle adjuster screw - for proper setting proceed as follows;
- start the engine and warm it up (run it for about 3 minutes operating the engine in
different RPM's)
- release throttle and let the engine come down to idle. Set the idle adjuster screw to about
1.800 - 2.000 RPM (centrifugal clutch starts to operate at around 2.500 RPM).
Low jet adjuster screw - for proper setting proceed as follows;
- standard setting for this adjuster screw is 1,5 turns out (anticlockwise)
- turning in (clockwise) results in a more lean setting
- turning out (anticlockwise) results in a more rich setting
When is need to re-adjust the low jet adjuster screw?
- operate engine in middle range RPM, release throttle ...
... engine run comes down to idle quick and
stays at proper idle
no adjustment needed
... engine run comes down to idle quick but
engine kills
to rich setting, turn in the adjuster screw
... engine run comes down to idle to slow
but then stays at idle (and/or idle run is
unstable)
to lean setting, turn out the adjuster screw
Make changes of the adjuster screw in 1/8 turn steps only and re-try procedure until
finding the right setting.
Important note! - when engine is new, it is very difficult to find the right settings of both,
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