Originally Posted by
*RC-ADDICTION*
Hey guys ive been running 16% from new, done about 4L. Want to go 25%, should i change anything or just re tune to suit? The engine is stock..
It would be a good idea to add a 0.1mm head shim when going up to 25%. The engine might not need it but best to play it safe and add the shim initially and see how it goes.