Hi Grumpy, I have rechecked from in-tank fuel filter through to carby, all clean with no leaks. Able to move governor arm with no resistance or pressure. Did read thread you suggested and watched the videos also suggested then went ahead and striped down carby and cleaned appropriately, slightly better but still jumping up and down in revs no matter the speed setting unless below half throttle were it will still cut out straight away. Do you think it could be the timing belt like you previously ( & like me ) hoping it wouldn't be.
Thanking you Paul.
