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Z50R 88cc Need An Opinion

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Blitz816

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Discussion starter · #1 ·
Hello , my next project is going to be a 88cc kit installed into a 1980 z50 , my question is , I have a 50 head and a Atc 70 head, if I measured correctly the intake and exhaust valves are the same size, only difference is the 70 head has a bigger chamber , I will be using a stock exhaust and a 18 to 20 mm carburetor , need an opinion on which head will I get the best performance out of , my theory is smaller chamber more compression bigger chamber less compression I could be wrong that's
why I'm here . Thanks. 816
 
Discussion starter · #3 ·
No I don't, not looking to spend that ind of money on one, I'm buying a little at a time til I get everything I need , just purchased a 85 ATC 70 engine so I can do a 4 speed conversion .

Thanks. 816
 
#4 · (Edited)
The atc70 head is bigger/better. The valves and ports ARE bigger. Measure the intake and exhaust port on both heads...where the intake manifold and exhaust mount up.

If you buy the correct piston for the atc head, it will be shaped to fill up the larger combustion chamber.
 
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Blitz816
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