Jammin JPX .28 head shim question?
#1
Jammin JPX .28 head shim question?
Guys, Im in the process of breaking in my .28 JPX. im using Odonnell 20% RTR fuel for break in. I took the head off of it and noticed that i have 3 head shims on it. I plan to run 30% after break in, do i need another shim or do i have enough installed?
thanks!
thanks!