We've replaced the pipes and rejetted, took off the carbs and completely cleaned them, and it idles great. As soon as you twist the throttle, the bike dies.
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: changing carb jets
the main jets just unscrew out use a socket if you can but dont over tighten when refitting.undo the 4 screws holding the carb bowl on and the jets are straight in view.
SOURCE: yamaha dt 200 won't rev off idle
You should measure the combustion ratio.Maybe piston rings failed.
SOURCE: Idling engine dies with even slight throttle twist.
Check float height in carbs.Thanks for asking and I hope this helps out.Please leave me 4 thumbs up.
SOURCE: yamaha ttr 125 will start
Check the intake for leaks.
Get it running and spray a little carb cleaner around the intake to see if the RPM's change.
If they do then you have an intake leak.
The jets may be clogged up but I do not think you need to increase the size at all
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