SOURCE: 2005 yamaha yzf 250-unstable idle
I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.
SOURCE: Cleaning Carb Jets
not to a trained ear also go by rpm and spark plug color
NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate
better use a manometer for adjusting screws
depends on condition of org parts
worn = richer running
new = lean an clean
also if changed the exhaust system need to
re-calibrate carbs for max performance
SOURCE: I hear talk of an air jet for the mukuni bs34
I believe they are referring to the nozzle the needle goes into. A venturi effect is created by the position of the nozzle in the throat of the carb. The nozzle has holes in it and the fuel is sucked through the main jet and out the holes to mix with the rushing air as the needle raises. Beyond that I haven't got a clue.
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SOURCE: what is a good carb set up on a 2005 yz125 with
this will depend on what gas oil mixture you have
check this topic out.
http://www.dirtrider.net/forums3/showthread.php?threadid=117838
http://forums.dirtrider.com/70/7640379/yamaha-dirt-bikes/yz125-carb-settings/index.html
regards,
voodoo
SOURCE: my 2005 yz250f will not idle and backfires on
check valve clearances first. will cause backfire and ide probs
a leaking exhaust gasket or low ignition voltage will cause backfire
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