17
3
Fuel system
The blending unit
Fuel and air are mixed here.
The blending unit
In this section of the carburettor fuel
and air are mixed in the proper
proportions.
The choke and throttle valves are
placed here.
In the middle of the venturi (narrowest
part of the throughput) the main jet (D)
is found.
Dismantling the carburettor
Remove the control diaphragm and
check for damage.
Replace if required.
Dismantling the carburettor
Carefully remove the control diaphragm
(A) and gasket (B).
Check the diaphragm for holes and
wear on the pin (C).
Replace the diaphragm if required.
The pump unit
Pumps fuel from the tank to the
carburettor.
The pump unit
This is where the pump diaphragm (E)
that pumps fuel from the tank to the
carburettor’s measuring unit is found.
The diaphragm is affected by pressure
variations in the engine’s crankcase via
an impulse channel (F).
If the channel is blocked, by grease or a
wrongly facing gasket, for example, the
pump unit does not function and the
engine cannot be started.
Summary of Contents for 333R
Page 1: ...Workshop manual 333R 335R English ...
Page 2: ......
Page 36: ...34 4 Centrifugal clutch ...
Page 40: ...38 5 Angle gear ...
Page 50: ...48 6 Cylinder and piston ...
Page 60: ......
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Page 62: ...2005W23 115 00 92 26 ...