WM, Workshop Manual, K650, K700, K950, K1250, 2001-06, Power ...

3
Fuel system
Speed limiter
Mod. 650, 700
A speed limiter is fitted on the side of the carburettor housing.
The speed limiter is fixed with Loctite and should not be released during servicing of
the carburettor.
A
When the engine speed is less than 9,200 rpm the ball seals the extra fuel channel (A).
The pressure of the spring presses the ball against the seat with a precise proven
pressure.
9600 r/min
When the engine speed exceeds the speed limit (9,600 ± 400 rpm) the spring-loaded
ball opens the extra fuel channel (A). The engine thereby receives extra fuel, begins to
putter and stops overspeeding.
Compensation insert for blocked air filter
The carburettor has been fitted with a compensation insert to prevent the engine
receiving an increasing amount of fuel as the air filter becomes blocked. This transfers
the underpressure in the carburettor’s inlet to the top of the metering diaphragm, as
opposed to the atmospheric pressure in a standard carburettor. The pressure difference
between the top and bottom of the diaphragm therefore remains constant and does not
increase as the air filter becomes blocked. The fuel supply to the carburettor’s main jet
nozzle is therefore always maintained at the correct level.
A
Check that the small O-ring (A) is in place
when the air filter union is installed.
It is important for correct function of the
compensation device that the O-ring is
neither damaged or missing.
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