Briggs and Stratton RPM Surging up & down
I have a 25hp. OHV v Twin engine in my riding mower. It has had a surging problem since I purchased it and it is getting worse. I have done some reading on it and Briggs says it is a bit normal and that it should have gone away after several tanks of fuel or full throttle operation; it's 5 years later and I can't stand it any more.
Does anyone know if this is a fixable problem and where should I start looking, there are no vacuum leaks and carb cleaner as an additive does nothing. Is a carb overhaul the place to start or governor adjustments, there seems to be a lot of this surging problem on the net but no definitive answer. HELP!