hanging idlle wr 400 '99

2 replies to this topic
  • clodeb

Posted August 26, 2011 - 05:01 PM


Still have my hanging idle!! change the pilotjet for a 50 i try 2-3 turn back on mixture screw,i also check intake boot for crack and tight hose clamp.... still the idle don't come down easily. I have the airbox cover remove and i run a Yosh rs3 full exhaust. If i play with needle will it affect my idle!?

or should simply swap for a more recent yam carb ..like a wr or yz 450. It is not fun to ride the bike in tight section in the woods with that fast idle,

All the help you can give me is welcome

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  • DB_Cooper

Posted August 27, 2011 - 08:59 AM


"Idle" issues or other "throttle" problems are probably a sign the TPS on your carb is going bad.
Very common problems include, Erratic idle-"Sticky" throttle like a cable is hanging up or "stammering" over rough terrain.

You can unplug it and see if it helps.

  • clodeb

Posted August 27, 2011 - 08:35 PM


What is really that tps thing doing..is it connected to the cdi unit... you see i am from the old school. Mikuni carb with no tps or acc.pump so! This bike is 12 years old so maybe the carb is worn out . Is there a way i can check with an ohm meter that tps thing.or symply the carb need to be change or overhauled!


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