ORIGINAL: Skillhouette
I have the GO Tech .21 7 port Turbo... It comes with an extra head shim... Should i use it for break in? What is it for? Also, Can i run 20% fuel on this engine? Or should i use 25% or 30% ? And why? Thanks!!
Your supposed to use the shim for break-in I think. Mine came with all 3 installed. I just recently pulled it out after 8 gallons to get some more life in my engine.