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5hp brigs lopes?

when its running and gets warmed up at full throttle rpms go up and down.the gov,moves in and out
darren, April 2009
This is due to a carburettor fault - either the float chamber isn't getting as much fuel as it needs due to a needle valve blockage or slight filter obstruction or there is a partial blockage in the main jet. A strip down and clean is required.

John, April 2009
link Click here to see other fixes for Briggs & Stratton.