i have a new 2 stroke kit, bought off amazon. great little engine, nice low end torque right out of the box. it is a 66/80cc china made ( y'all call 'em china dolls or girls? i think?). it has a one piece jug/head, slanted spark. piston looks pretty flat from the spark plug hole. i was wondering if i can buy any 8mm head and jug to replace the factory. i'm not looking for more power, it's got plenty, right where i need it. it's hilly around here. this is a daily driver in spring and summer, but it gets hot!! i only want more cooling that this small thin finned factory set up. any advice on what jug and heads i can use? are the pretty much universal for the head/jug bolt size?