How many head shims are you guys running. It came with a .1mm and a .2mm shim. In the manual it says when breaking in use both but when using low nitro content take the .2mm one out.

What's considered "low nitro content"?

I'm using 16% fuel with both .1mm and .2mm head shims and it seems to run ok but i want to experiment and try to get the best out of it.

Thanks, any help would be much appreciated