I have a choice of getting a 4mm or a 4mm w/ 5mm long rod. The Shee is used for recreational play no duning as of yet. Mostly big fields and fire roads. I like good midrange and I want to know which one of those combos will be the best. The pistons used will be the Vitos Superstock pistons 64mm. Also with advanced timing, k &n pods, noss head 19cc or 20cc domes, v force, with stock carbs for now.
thanks in advance