Originally Posted by
Serpent fan
Are you sure about that? I am not sure how to read that statement in the manual;
-Do you have to shim when you're 5% over 16%, meaning you don't have to shim if you're using less than 21%?
-Or do you have to shim once the nitro exceeds 16%?
Well I am going off of experience. Last year I ran 18% at a few races and never added any shims and the motor ran fine. This year I added .2 shims to the same motor and ran 25%. Again the motor ran fine.
For 20% I would add a .1 shim.
If you want that added safety then add the .1 shim and see how it runs for you.