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Hello, Dr350 jetting, need help.

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Hello, my bike is dr350 with an aftermatke pipe, open up airbox and k&n open filter.

My jetting: mikuni tm33ss carb, MJ140, PJ37.5, 4# on the needle clip.

Actually the bike starts well and going well at high rpms but at the mid rps he bogging and back fire when i leave the throtle.

what would solve this problem? maybe bigger PJ? if yes what type of PJ would fit? where can i find them?

Tanks alot.

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