Originally Posted by
NitroWD
what's the reasons behind?
my current shims are 0.5mm...
actual head clearance is 0.55mm.
you have gone from a 7 plug to a 6. there will be some tuning needed .
i have had others have the same problem with nosram plugs. if the picco plugs fit, then also try a ninja 6 plug. i run them in my JL , they work fine.