Why am i four stroking worse with 82 jet, than 85?

GRINDER /
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ZA50

65CC MK

Biturbo

19mm PHBG

I was four stroking with the stock 85 jet. It would go faster at 3/4 throttle than wull open, so I bought an 82 from treats and installed it. Now its worse. Cant even get up to speed any more. Plug is oily as hell. I also examined the holes in the jets before installation and I thought the 82 looked bigger.

Common sense would say an 82 is smaller than an 85, but that doesnt seem to be the case.

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