Carburetor, fuel pump, throttle linkage,  M110

Adjusting float level



07.2-180 Adjusting float level


Testing and adjusting values


Float version
Float level1)


Flat roof float
~2 to 6 mm3)


Hip roof float and fuel return valve without fuel pressure control
0 mm2)


Hip roof float and fuel return valve with fuel pressure control
+ 2


‘) Measured from parting surface without gasket.
2)  With starting or bypass faults, set 2 mm higher.
3)   Below parting surface.


Conventional tool


Depth gauge or slide gauge with depth gauge




The float level has an influence on starting character­istics particularly on gradients. If it is too low, the starting performance may become poorer, because the fuel level in mixing tubes of stage I is too low and the main jet system will start too late. In the event of starting faults, set to upper float level tolerance value.


Testing, adjusting
m110 - 0351-1.jpg
1 Check float level and adjust, if required. For this purpose, push connecting web (arrow) downwards against noticeable stop and check float level without gasket.
To prevent measuring errors, make sure that the float shaft rests on housing base while testing.
Measuring with flat roof float


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Measuring with hip roof float
m110 - 0352-1.jpg


2 Correct float level by rebending at specified bend­ing spot (arrow).
m110 - 0352-2.jpg


3 When installing float, attach float needle with wire clip to float arm in such a manner that the open side of the clip is pointing in driving direction.
Install float (32), making sure that the float shaft rests on base of recesses. Install holddown (34). Holddown should project slightly over parting surface. Rebend, if required.
m110 - 0352-3.jpg


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