Operator`s Manual RM1
Seite/page 75/132 ROTAX KART RM1 Ausgabe/Edition 01/2006
1.2.2. Functional principle of the engine
Single cylinder 2-stroke engine with reed valve intake. Oil-in-fuel lubrication, i.e. the oil is mixed
with the fuel at a specific mixing ratio.
The power transmission to the rear axle is via a manually shiftable integrated 2-speed gearbox and
not, as usual, via a maintenance intensive chain drive.
1.2.3. Gearbox
The power transmission to the rear axle is via a manually shiftable integrated 2-speed gearbox and
not, as usual, via a maintenance intensive chain drive. Changing gear actuates the gear shift fork
and a shifting sleeve which slides on the hollow shaft between the 1
st
and 2
nd
and then engages in
the respective idle gear.
The gear is kept in position by an index pin keeping the gearshift fork in the selected position, 1
st
gear, neutral or 2
nd
gear.
To allow shifting into 2
nd
gear without lifting from the gas pedal the ignition is cut-off for a moment
when actuating the shifting paddle.
1.2.4. Centrifugal clutch
The engine is equipped with a centrifugal clutch operating in an oil bath. This clutch separates the
engine from the gearbox at less than 2.500 r.p.m. Only at an engine speed of approx. 6.000 r.p.m.
the centrifugal clutch is completely engaged.
1.2.5. Overload clutch
The engine has a mechanical overload clutch which is linked with the rear axle. This is to protect
the crankshaft from hard shocks from the drive components which are not usual in normal
operation. An example would be the locking of the rear axle
1.2.6. Oil drain screw
The oil drain screw is magnetic, in order to attract metallic particles and clutch abrasion from the oil
bath. The oil drain screw has to be cleaned at every oil change.
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