Specifications

Fine Tuning for Operation at High Altitude
Checking the Spark Plug
check the standard setting.
Warm up the engine.
T
urn the high speed screw (H) slightly clockwise (leaner). On models with limiter caps, turn high speed
s
crew (H) 1/4 turn, but no further than stop.
If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overhe
ating.
A s
light correction of the setting may be necessary if engine power is not satisfactory when operating at
h
igh altitude:
If engine is down on power, difficult to start or runs poorly at idle speed first check the spark plug.
Remove the spark plug - see "Starting / Stopping the Engine"
Check electrode gap (A) and readjust if necessary - see "Specifications".
Rectify the problems which have caused fouling of spark plug:
- To much oil in fuel mix.
- Dirty air filter.
- Unfavorable running conditions.
F
it a new spark plug after about 100 operating hours -
or sooner if the electrodes are badly eroded.
To reduce the risk of arcing and fire:
1
3
2
13