thanks for the support pipercub
I tried it with and without the baffle using an os 160 pipe not too bad but max rpm was without the baffle , even tried without the endcap 5000 was max remember the engine is worn and not much compression . Also the carb is a Wilbro off an echo whipper snipper a little bit bigger with a velocity stack....keep in mind the currency rate $220.00 aust...about $130 us ... Just about to do another conversion on a ryobi approx 30cc for a mate seems to be a but easier with correct rotation for a start , rear carb and exhaust and a shorter nose on the eng. heaps of compression..let you know how it goes...