I just bought a bird with the GMS .47 and tuned silver pipe.

Runs fine then, in flight loses power.. needle out 3 1/2 turns....lands motor a littel hotter thnan ormal but not smoking. High end needle unresponsive....sounds like everyones probelm.


Great thead, I will be doing the carb inlet inspection and tank position inspection.

This thing screams ....but it needs help to maintain its flow. Wayne, I will post my results.

This thread is a good source on this engine, I hope everyone who search's on GMS will find it.