If you want to see all the diufferent porting designs that have been used in model engines since they began, get Dave Gierke's book on two stroke model airplane engines. Its a wealth of info and a history lesson too!

AJC

I agree with Dar again on this... allthough I do not use idle bar plugs myself some engines do run better with them. As for being hard to get, Fox still makes TONS of them.