[cray0752]

Hi Just got a lawnmower today all in bits put it back together again and started the engine and it keeps reving up and down unless it is set in the choke position please can you help me

[Gwiz]

we'll try to help if you can tell us what engine you've got....

[cray0752]

all i can tell you it is a four stroke and all it says on topis proformance not sure on the make

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will try to find out

[cray0752]

just found engine make 4hp ggp engine as fitted on a mountfield apparently

[Gwiz]

I haven't got enough information to tell you whats exactly wrong with it.
How old do you reckon the mower is?
is the carb separate from the fuel tank, or joined to it?

from what you describe, it sounds like the engine is hunting for fuel. This is usual caused by a blocked jet in the carb. It can also be caused by a damaged inlet manifold gasket.

[cray0752]

i think it is about one year old the carburator is connected to the cylinder as the fuel tank is part of the top of the mower the fuel tank is connected to the carburator by a fuel pump if i can i will upload a picture
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Cheers Charles

[cray0752]

it has now started blowing white smoke even after there is no oil in the sump think i take it to bits and clean up the parts on it aswell