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MAN-028
Having fixed a sprocket ratio, it could be necessary to improve the engine performance
either at low or at high RPM.
This could be achieved by modifying the exhaust lenght.
In general, by shortening the total exhaust lenght an improvement at high RPM is
achieved and vice versa, by lenghtening the exhaust lenght the low RPM is improved.
When testing, never exceed in lenghtening or shortening the flexible by more than
5mm per time.
10- CENTRIFUGAL CLUTCH
The engine has a low maintenance dry centrifugal clutch.The following prescriptions, if
carefully followed, will allow a long clutch life.
When starting the engine make sure that the brake pedal is fully pressed to avoid
sudden accelerations.
ATTENTION:
Once the engine is started, avoid useless accelerations which can overheat and
deteriorate the clutch. Oil the chain before each tests, after each race or test,
check the engine sprocket. Replace if necessary.
A bad alignment of the engine sprocket with the axle sprocket or the lack of oil
will damage the engine sprocket.
Check the clutch:
Every 5 hours of use.
When metallic noises are heard inside the clutch.
If the kart dragging speed exceeds 6000 RPM.
Every time the clutch has overheated (presence of smoke or smell of burning).
To check the clutch, you must remove the clutch cover and the clutch drum.
Replace the clutch:
whenever the thickness of the friction material (see drawing) is lower than 1.5mm
on point A of the clutch or if the body diameter is lower than 82.5mm.
whenever the external friction material in the A portion of the clutch is very rough
(wear or degradation of the friction material due to overheating).
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