YZ426 wont start


3 replies to this topic
  • spiritaces

Posted August 08, 2012 - 10:11 PM

#1

I got an 02 yz426 the other for an amazing deal, $100. I brought it home and tried to start it. It took quite a few kicks to get it started. When it fired I had to give it gas to keep it running. I decided to clean carb and air filter. I also changed the gas and plug. I tried again to fire her and like before it took quite a few kicks to get her started. I had the bike choked and took her for a run. It ran rough and when I took the choke off it died immediately. Also after only one minute or less of ride time the pipe was glowing hot. The radiator fluid is full btw. Also at this point I noticed that I can kick the bike over without the decompression lever. I decided to take the valve cover off to see if the valve train was okay. When I kick it over and watch the valves they all seem to be working and moving up and down fine. What at this point could a possible problem be? Any help would be appreciated. Thanks

  • etuke

Posted August 09, 2012 - 02:43 AM

#2

off timing maybe?or valves need adjustment.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Slow and Jerky

Posted August 09, 2012 - 05:01 PM

#3

The glowing pipe is normal. But I would do a compression test (if you have a manual compression release). Tight valves/low compression could definitively be an issue. The jets in the carb have to really cleaned well, if it is something that has been sitting for any period of time I would soak the jets over night and put lots of air through them.

  • spiritaces

Posted August 11, 2012 - 01:27 PM

#4

I'm going to try and check the valves today and then I will let you know about that





Related Content

Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
Forums
Photo

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.