RE: A not so SUPER TIGRE
Hi pelham,
If you are happy with the running in, I certainly agree all is not well. A ST 75 in my Super Chipmunk turning a 12.5 x 6 Bolly has great verticle performance. In a 4 Star 60 it should be amazing.
If you have eliminated any air leaks check there isn't any casting flash blocking the engine pipe or muffler. If not back to the agent for warranty or replacement.
Cheers,
Colin