I think it is great the rc engine people all over the world do come together to solve a problem. For the RC people that want a quick ...maybe even better fix. Try a differant carb. I was given a old Fox engine long ago. The carb was junk, compared to other carbs. The engine itself had very good compression and the bearings felt good. I took a Perry carb off a engine about the same displacement, and put it on the old FOX. Boy did that engine run after the carb transplant. If you need a bushing adpter.....turn some round stock to the dia of the old carb and then drill it with the tailstock to slip fit of the smaller carb. Works great. Also if you think you got a leak around any carb...clean real good and use some clear silicone sealant to seal it. If that takes care of the leak...your in business. There are all kinds of sealants you can use. Basically...if a engine has good compression and seals and bearings are good....it should run good with the right carb. Or in some cases a good carb. After-all you only got 3 moving parts in a 2 stroke engine. Carbs...on the other hand can have many more parts. Also most Supertiger carbrs are quite adjustable. The brass piece can be turned to effect the mid range. Good carb if you take the time to read about how to set them. Well I hope the GMS problem is solved. May buy one some day. I have talked with guys that love them. Best to all....Capt,n