if you want to put a 70 kit in you shouldn't need to change anything other than the engine parts i didn't manage to get time to so the one i was supposed to do last week but i have to do it this week i will let you know
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https://www.ooracing.com/big-bore-kit-only-72cc-suitable-for-madass-50cc.html this is oo racings link it is a bit expensive but it comes with barrel piston head and valves and a uprated carb