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Re: What is the right Jet sitting for a Mikuni KX 125...
It should have a #370A main jet in it. The pilot jet should be a #35. The jet needle should be a #R-2. The throttle screw setting is one and one half turns outward from a LIGHTLY seated position.
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check fuel line.... from tank to carburator.... probably your having fuel problem, there might have some foriegn object that got stock up... check out the main jet....
You have a mikuni carb. there are curcuits to the carb. the first that works from idle to 1/4 throttle is the pilot cicuit, from there you transition to the needle jet/and jet needle. That controls the 1/4 to 3/4 throttle and then the main' jet which controls WOT. you may have a air screw that would be before the throttle plate if it is after it is a fuel screw find the factory specs for the jet sizes and make sure all is correct. if not you isolate where the problem is and correct in a rich or lean adjustment' I race yamaha 2 stroke road racing bikes, it is not an easy task sorry to complicate you so much
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