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'74 Honda Z50 is popping in high Revs, why?

I just put on a new brand new 88cc piston upgrade and it has a 20mm carburetor and a bigger oil pump too. I start it and it idles just fine. Once I put it gear and give it gas, a popping noise happens repeatedly until it simply idles again. Any ideas? Thanks.

Update:

I guess I have bigger issues now... I can't seem to get it started after I rejetted it. DOH!!!!

1 Answer

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  • 1 decade ago
    Favorite Answer

    Rejet it

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