2010 yz450f not starting

6 replies to this topic
  • jacobYz

Posted February 18, 2015 - 05:04 PM


At first it was dying in first and second with the clutch in. The next day it started and soon died. Now it won't start at all. I cleaned the air filter, and checked the spark plug. None to be the problem so far I was wondering if anyone had this problem with an EFI bike or had any suggestions.

  • billygildark5007

Posted February 19, 2015 - 06:24 PM


There could be several things causing this. Not all efi related.
Did you check your clutch has the correct free play?
Did you check the valves?
Get your hands on a tuner and check for any fault codes.

  • jacobYz

Posted February 19, 2015 - 06:26 PM


Yes about two mins ago I got a fault code 22 which if I'm not mistaken is a coolant sensor failure

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  • billygildark5007

Posted February 19, 2015 - 06:37 PM


21 is coolant temp sensor 22 is iat (intake air temp)
It's on the right side of the throttle body above the tps

  • jacobYz

Posted February 19, 2015 - 06:40 PM



  • billygildark5007

Posted February 19, 2015 - 07:23 PM


Clean the connection and check the harness and ensure it's plugged all the way in. Clean the little hose and passageway. If that doesn't work replace it.

  • grayracer513

Posted February 19, 2015 - 08:07 PM


There are specific testing procedures for each sensor in the manual.  Have one?

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