rhetorical comment but i would sort of understand to lie to someone about saying your atv has work done when it doesnt to make a sale but i hear people claim their atvs/toys have lots of work done and when it comes time to show what it can do they get scarred or get embarrassed... not trying to stereotype people but it was norm to hear people talk"big talk" and brag about what mods when i lived in VA and SC, "everyone" had big bore atvs and motorcyles, 100mph quads were "everywhere." bunch of ______ if you ask me.
 
just take the head off and measure the bore with calipers
stock stroke crank would require a 77 mm bore (+10mm) to make 330cc engine