qaulcast 35s engine is hunting how can i fix it

johnwootton, March 2009

change spark plug. if plug is breaking down fuel dosent burn correctly slowing engine down goveners open up throttle bring up engine revs engine cant burn fuel properly slowing down revs hence vicious cycle

terry, August 2009

Did you get an answer ? because i've the same problem

george, May 2009

I assume you have adjusted the mixture screw on the carb and this hasn't fixed the problem. The most likely culprit is the governor mechanism which is very easy to understand. These mowers have an air-vane governor which means the wind generated by the spinning vanes close to the recoil starter push against a plate - this is balanced by the governor spring attached to the carb. To check this out there are 3 things you mjust do:
1. Remove the cover (4 bolts) over the recoil starter. Check the vane is OK and the spring is attached.
2. Refit the cover and secure. This is very important.
3. Replace the spring from the carb to the vane.
That should fix it. Remember to turn the mixture screw in fully, then back it our 3/4 turn. Start the engine, let it warm up, then back out the screw bit by bit till the engine runs smoothly

Peter, April 2009

Basically you need to have the carburettor cleaned out using a solvent and compressed air. Together with a new air filter, this will cure it.

John, March 2009