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tm 41 part fell off (i think) what was it???

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i've got a fairly old xrsonly mikuni flatside (tm 41?) and it started bogging off idle today ... after getting the tank off and checking everything for loose bits i see some fairly non dirty threads next to a hole going down into the carb from the air cleaner side at 12 oclock high as it were ... i looked up a mikuni diagram and it said that bit was a "boss for power jet" and had no more info ... this bit is right above the other air mix screw that turns with a flat head screwdriver a

could this missing screw be causing the bogging?? if it is in fact actually missing

plug looked good

92 xr600r 400-500 ft above sea level where it worked just fine last week and at 5000 the week before

Edited by grumpyman

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and after the bogging started the air screw on the right side stopped having any affect on the idle no matter how far out i backed it

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