ORIGINAL: evan-RCU
Talk to Robert at MVVS, they can do any modifying.
That's not MVVS... it's Morris Hobbies. Did't know they did that kind of service to engines. Nice to hear they did a good job with them.
What props are you running and at what RPM?
Twin speeders are cool. The sound is an experience on its own. Just watch it when one of them engines flames out. Ah well, at least you've got carbs to throttle down the other one...
Good job!