Great thread guys thanks! In my original post I mentioned that iv never balanced a prop.... well I lied. "Iv never used a commercial balancer". IV used something as simple and jack legged as a pencil to get a heavy blade to drop. A round pencil not the hex shaped, or any small smooth dowel, for 46 - 60 c.i. And like I said iv had good luck with my engines. Good thread though guys keep it coming.... I just gotta say, and I all ways look for an opening to put this in every thread. " Is it just me or r those OS engines the sh*t". Yah theres bad threads on them out there but mine sure has ate some dirt 50-100 MPH +. The remote needle valve was broke off and I wired it back with mechanics wire, at least two gallons with a tuned pipe pulling 18,000 rpm, still running strong and starts easy every time, man what a tank. Yah over priced, but ill pay an extra 50 bucks for this kind dependability. Im not an OS sells rep BTW... maybe i should be though uh. lol thanks agen guys. T