Hi guys,

Tried balancing the Phelon flywheel instead. Did a rough balance on the high point to see if it helped. Ran it up with the prop/hub etc and boy what a difference, that was obviously the problem. Well, now im gonna spend some time perfecting the balance and hopefully thats problem solved. BTW getting 7k rpms on APC18X8 on a new (1/2 tank) piston/cylinder, not too bad I think!? (sea level, 24 deg C)
Cheers
Mark