I was wondering if you could help me out. New to nitro cars. Just built HPI R40 and put in 12TZ(P) 3port OS engine. Can't rotate the engine past the top of the piston. Have put a heat gun to it for at least 5 min, and still the starter box can;t turn it. It's even difficult by hand. Any suggestions?

Thanks

Sorry meant starting engine

This FAQ should help you:

http://www.osengines.com/faq/product-faq.html#q1