Originally Posted by
Lille-bror
Don't all Novarossi engines comes with 2 alu (0,3 mm) and 1 cobber (0,2 mm) head shims?

. After the break in you should run 0,7 mm if you are running 25% nitro.
... and a hotter plug after 2 or 3 gallons if you run 25% nitro

you're right, some like to drop down to the .70 after breakin, but not really necessary