Was idling high with inboard header pipes cooler than outer two. Pulled carbs and removed bowls and found idle jets both plugged for the two iner cylinders. Opened them carefully so as not to damage or change jet size and reassembled. Now carbs are clean, jets are all open. Starts easily but revs higher than it used to when choked. Warms up much faster than it used to and when choke is taken off after warmup it idles low with what sounds like a miss in one cylinder, but all four header pipes are hot. Haven't tried to bump idle up yet as I want to address the "Miss" first.
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: 02 Vmax Idels on choke will no idel or advance
you have a fuel delivery problem...have you tried a carb cleaner? You may need to remove and rebuild the carbs.
SOURCE: idles but won`t accelerate
Change fuel filter.
fuel pump sounds fine.
Check for kinked or blocked lines.
If it has a fuel recovery cannister service it.
SOURCE: wr400 2000yr hard starting & won't idle
buddy change the plug also on the carb there will be a idle screw turn this in 1/4 of a turn with the machine running and get back to me 
SOURCE: 1995 yzf 750 wiring diagram, starts wont rev
Hi and welcome to FixYa,
Would the wiring of a 95 YZF750 R/SP European model help?
Good luck and thank you for asking FixYa.
Testimonial: "the blue yellow black wires i was looking for appear to be for tps unit whitch is missing thanks this gets me going in correct direction "
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