High idle

8 replies to this topic
  • springer8828

Posted April 10, 2015 - 04:52 PM


Hey guys 09 yz450f just picked it up only thing that I have noticed about is every now and then the idle will go up after I let off the throttle it will stay up for a few mins and then back down what could be the cause of this

Edited by springer8828, April 10, 2015 - 07:22 PM.

  • geedavell

Posted April 10, 2015 - 07:22 PM


Check the routing of the throttle cable.

Does it change RPM when you turn the handlebars to either side?

  • MotoAddict530

Posted April 10, 2015 - 08:37 PM


Air leak?


Posted April 10, 2015 - 09:08 PM


Air Leak.  Or fuel screw needs adjusting.

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  • springer8828

Posted April 11, 2015 - 04:59 AM


It doesn't do it when I turn. How is the best way to check for a air leak? I will check the fuel air screw to thanks guy's

  • MotoAddict530

Posted April 11, 2015 - 06:26 AM


Use carb clean or brake cleaner and spray the rubber boots and junctions around the card. Do this while the bike is running. If the idle spikes then you have a leak where you just sprayed. The same trick is used to look for leaky vacuum lines in cars and trucks.

  • springer8828

Posted April 11, 2015 - 07:49 AM


Oh alright cool thank you

  • grayracer513

Posted April 11, 2015 - 11:07 AM


Check your valve clearance. Right intakes can cause this.

  • springer8828

Posted April 11, 2015 - 02:08 PM


Alright will do

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