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uk jetting help

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any advice for jetting sizes for the uk.suffering misfire on 3/4 to wot

98 wr400f airbox mod, yz throttle stop, unknown muffler, cam timing???

MJ 150 needle mid point

mixture 1.5 turns

other jets 82 and 35???

jetting knowledge not a lot!!!! 😢

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Your symptoms are that the bike is running rich.

Does this have the stock needle?

The main jet is smaller than stock and normally would not be too rich unless the needle has been replaced. The pilot jet is smaller than stock too. Did the air jets get replaced?

We need to know all the jets in the carburetor to make suggestions-

Needle code, pilot air jet, and main air jet

James

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i bought the bike as is so dont know about any chamges, air jets are 50 and 160 didnt note the needle size but will check.

thanks

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