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Wayne, Engine Rebuilder
Category: Small Engine
Satisfied Customers: 9448
Experience:  many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines
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I have a 20 hp &S single cylinder engine model # 331777 type

Customer Question

I have a 20 hp B&S single cylinder engine model # 331777 type 1372 B2. It is on a Sears Crafstman riding lawnmower model LT 2000 model ####-##-####
The engine surges or hunts - the rpm goes up and down. I have cleaned the carb, replace fuel filter and spark plug.
What can be causing my problem.
Submitted: 10 months ago.
Category: Small Engine
Expert:  Wayne replied 10 months ago.

Hi I'm Wayne

I will help you with this

what you are describing is 1 of 2 things

the governor spring lost tension, Replace

other is adjust the valves,engine cold .006 both valves

I hope this helped you

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