Stock 216-235's in good condition are safe to operate up to 4000 RPM. After that do it in small bursts. As a kid all of us used to run the pants off of these things and I never saw one come unglued. You guys are afraid of them, I say run it like you stole it. You'd be surprised just how good they are.
I personally know of balance 6's that run over 7k.
Last edited by 53moneypit; 09/19/2008 11:03 PM.
