06 yzf450 Help cant Figure it out.


7 replies to this topic
  • Vince911

Posted March 08, 2012 - 12:02 PM

#1

So my customer brought in an 06yzf450. It acts like its running really lean. Backfiring, popping, shooting flames. With a minute or less its hot. I changed the gas. Changed the jetting. Adjusted the valves. Correct timming. Checked for an air leak. I can not figure it out. Nothing seemed to help. He does not want me to pull the head due to money. There is a rattle you can hear from time to time you can when kicking it over. So im sure its about to go. Any ideas or suggestions would be helpful.

  • cowboyona426

Posted March 08, 2012 - 12:08 PM

#2

Is the plate in the carb slide in upside down?

  • Vince911

Posted March 08, 2012 - 12:16 PM

#3

Nope its in right.

  • Vince911

Posted March 08, 2012 - 12:24 PM

#4

Checked and adjusted hot start and enrichner.

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  • CO_Rider

Posted March 08, 2012 - 02:53 PM

#5

Not to second guess but I would check the valve clearence again. Just sounds like the symptoms. Have you checked out the exhaust packing?

  • Chas_M

Posted March 09, 2012 - 07:36 AM

#6

Have you checked to make sure that the idle circuit is working properly? Have you cleaned or replaced the pilot jet?

  • CROGGR

Posted March 10, 2012 - 08:43 PM

#7

Checked and adjusted hot start and enrichner.


Replace the o ring gasket on the slide plate and make sure the plate intself isn't cracked. Use a magnifying glass and make sure! I have fixed several yz's that have had the same problem, and also make sure the acc pump nozzle is squirting fuel!

Edited by CROGGR, March 10, 2012 - 08:43 PM.


  • yz450fcranker

Posted March 13, 2012 - 12:56 PM

#8

open her up she might want a rebuild





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