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thanks, i've being looking on ebay and they sell the 160cc bore new, also the 160cc piston fairly cheap - would this work? are are they any good to buy? also would a thicker headgasket fix the headgasket problem stated above?

hi, i got a knocking sound coming from my pit pro 140cc so pulled the engine apart - while it's apart thought may as well upgrade the bore to 160cc. my question is what parts do i need to actually need to do this? and will there be a noticibly difference power wise? i'm fairly new to pit...