WHAT IS THE CAUSE OF ENGINES HUNTING?
The most common cause of engines ‘hunting or surging’ is stale fuel evaporating, leaving residue on the main jet or dirty fuel causing partial blockage of the jet. If the motor runs smoothly on partial choke, this usually indicates main jet restriction. **Other causes can be worn or cracked carburettor insulators or poor sealing gaskets. If the carburettor is damaged on the right hand side near the blower housing this will cause the engine to hunt or suge as it will provide increased air flow across the back of the carburettor vent which will upset the fuel level. In this instance a replacement of the insulator will be necessary.
