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dooley_of_gw

Further to my carb question on surging B&S 18HP

dooley
12 years ago

Unit details:

Engine B&S 18HP Model #422707 Type 151001

Tractor : MTD 820 Model #143P820H528

Have no idea how many hours on it. Bought it used about 5 years ago and only maintenance has been oil changes , plugs and a few small parts here and there.

Symptoms:

Engine surges. Most noticeable at idle where it will die after a few surges. Closing choke part way helps some , but doesn't eliminate the problem.

Observations:

With air filter removed , I can look down the barrel of the carb. After the choke at the bottom of the barrel there is what appears to be a butterfly valve that opens and closes.

Engine running at idle , butterfly valve closed , fuel sprays into carb. Engine starts to die , valve opens , engine revs up , valve closes , fuel sprays in, engine starts to die , valve opens.

This cycle repeats itself a few times then the engine eventually dies.

Things I've tried:

1) Changed fuel and fuel filter.

2)Sprayed a can of carb cleaner through the thing.

3) New air filter but running engine with air filter removed makes no difference so obviously that's not the problem.

Can you think of anything else I could try?

Is it time for a carb rebuild or rebuilt carb or could it be something simpler.

Any suggestions appreciated..

Comments (2)

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