Originally posted by compaq888
actually i called the hobby shop and they said the turbo version has a different piston and sleeve and a different turbo button. I know for a fact the turbo version has a different turbo button but what about the piston and sleeve??
Also I can't exchange it because i've put it on my car, you wouldn't believe it but it took me about 3 hours, because i'm only familiar with hpi and traxxas engines with regular cranks.
Find a more knowledgable shop, only the button differs.
Standard head shim is .3mm, suitable for up to 20% nitro. Higher nitro will require extra shims and colder plugs to prevent detonation.