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hayter mower with B&S 375 engine, motor oscilates fast and slow?

The moter starts up OK, but after a few seconds the speed is no longer steady, but oscillates between fast and slow. Will changing the regulator springs help?
astrasew, March 2012
The problem is probably due to dirt in the carburetter - remove the float chamber bowl and clean, also clean the brass jet housing that secures the bowl - it worked for me.

daxidad, August 2012
link Click here to see other fixes for Hayter 375.