Hi all.

This is not really a modding question but it seems to be the right place to get a sensible answer.

I am helping someone to tune a Rossi 173R12 X3 and am having some difficulty.

So I started checking through the basics and discovered that the head clearance would not compress a piece of 1mm solder.

Removed all the shims and the clearance is 0.7mm.

Can this be right. If not, what should the clearance or compression ratio be for 16% nitro?

Thanks