2009 yz450f Stopped Running.....


9 replies to this topic
  • Themackattack

Posted July 06, 2011 - 02:47 PM

#1

I was riding my bike on saturday and it ran fine, went out to use it sunday and nothing... Kicks over fine, and back fires occasonaly. It would start up if i bumped started it down a hill and would run ok but wouldnt idle.

So i changed the air filter, and put in a new plug.

I am stumped on what to do next

If anyone has any info or help please feel free to chim in!

Thanks

  • blakers213

Posted July 06, 2011 - 05:37 PM

#2

I'd start with the carb. Check the jets, see if any are clogged.

  • Themackattack

Posted July 06, 2011 - 07:01 PM

#3

alright, ill take the carb apart and take out the jets and clean em up. Anything else in mind if that dosnt work?

  • Themackattack

Posted July 07, 2011 - 02:50 PM

#4

Cleaned out the carb and same thing, backfired on the first kick then nothing after that......

Any more suggestions? I herd something about the timming chain maybe? How do i adjust that

  • dvn

Posted July 07, 2011 - 04:02 PM

#5

Cleaned out the carb and same thing, backfired on the first kick then nothing after that......

Any more suggestions? I herd something about the timming chain maybe? How do i adjust that


Did you remove the pilot jet and clean it or better yet, replace it? If it runs fine other than idle, I don't think it jumped time. Why don't you pull the valve cover and check? I'm still betting a dirty pilot.

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  • Themackattack

Posted July 07, 2011 - 04:19 PM

#6

i did clean the pilot jet and everything looked clean. How do i check the timing?

  • grayracer513

Posted July 07, 2011 - 05:54 PM

#7

i did clean the pilot jet and everything looked clean. How do i check the timing?

You're saying you don't have a manual?

http://www.yamaha-mo...uals/index.aspx

http://www.yamahaown...ook.com.au/?r=0

  • stevenb28

Posted July 09, 2011 - 03:25 AM

#8

Thats valves way out of spec, can almost guarantee it. I had the same problem.

  • Themackattack

Posted July 11, 2011 - 03:18 PM

#9

i checked the timing chain and valves and everything is in spec.

I am thinking that it might be the magneto not produceing enough spark to start it as it is back firing and will start if i push it down the hill.

I put fresh gas in it also now.

Anyone else thinkin of what it could be?

  • grayracer513

Posted July 11, 2011 - 04:49 PM

#10

Verify that TDC as indicated by the flywheel is really TDC at the piston.





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