Hi Andy,

Thanks for the information, I also have the .76 as well as the two different models of the .47. I only had the problem with my older .47 with the "silver" muffler without fins.

I hope you are able to try the modification on your friend's GMS. The intent of this thread is to find the source of the problerm so all can make this engine run reliable.

I agree, when a GMS it is running right, I think it is the best bang for the buck.

Please keep us updated on any progress with your friend's engine and hopefully, collectively, we will all get to the bottom of the problem and solve it.

Thanks for your comments.

Fly4Fun,

Wayne