mikuni trouble

i have an 84'tecate 3 wheeler with a yz 400 moter and my carb is acting up and i would like to know if anyone knows about where the throttle screw needs to be set at any info will help

is that the yz400 air cooled 2 smoke or the 4 stroke from 98 or 99? one would clearly believe the thumper is more deserving of a better chassis..lol

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