I have a 70cc Metrakit with about 200 miles on it.In good condition. It would be the clyinder head,cylinder, and piston.You would need to use your clips and decomp valve.
I also have a almost new PA50II replacement carb. I came from Ebay.He is selling them for $60 + shipping.It was only used once to test it.go to Item number: 230190652182 to check them out.
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