English
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).
Fine Tuning for Operation at High Altitude
A slight correction of the setting may be necessary if engine does not run satisfactorily:
NCarry out the standard setting. N Warm up the engine.
NTurn the high speed screw (H) slightly clockwise (leaner). On carburetors with H = 3/4, turn no further than stop.
NOTICE
After returning from high altitude, reset the carburetor to the standard setting.
If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.
Spark Arresting Screen in Muffler
In some countries, the muffler is fitted with a spark arresting screen.
NIf engine performance deteriorates, check the spark arresting screen in the muffler
NLet the muffler cool down
Version A
1
137BA025 KN
NRemove four screws
NRemove exhaust casing (1) of the muffler
NClean the dirty spark arresting screen, replace if damaged or heavily carbonized
NRefit the spark arresting screen in reverse order of steps
Version B
In this version, the muffler is equipped with two spark arresting screens.
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NRemove screw (1)
NLift and pull out the spark arresting screen (2)
NClean the dirty spark arresting screen, replace if damaged or heavily carbonized
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KN137BA026
NBend back the retaining lugs (2) N Pull out spark arresting screen (3)
NRefit the spark arresting screen in reverse order of steps
NCheck second spark arresting screen – as with Version A
42 | MS 660 |
