Any idea whats wrong?


5 replies to this topic
  • Flanders87

Posted January 14, 2010 - 05:00 PM

#1

My yzf 400 is having starting problems. I have pop started several times on three different occasions without any problems. I could never figure out how to kick it over, however i replaced the spark plug a week ago. On that day i was able to kick it over four times, all of which one were on the first kick. I have not been able to kick it over since. On that day i let it ran for not more than a minute and shut it off via the kill switch.

When i was informed that shutting it off without reaching operating temperature fowled the plug i replaced because again i could not kick it over.

Today i pop started it several times and it ran fine. While it was hot i kicked it over one time, but could not kick it over since. While i was riding it the exhaust head pipe was glowing cherry red. It seems that the bike has to much oxygen, but im not a professional. I plan on trying to pop start it again and running the bike with the choke on to see if it limits the amount of oxygen going into the carb.

I don't understand why this bike won't kick over, but did perfectly that one day. I love this bike, however i can't go through this ordeal everytime i stall on the trail. Im seriously debating selling this bike, but i feel its probably a stupid little issue i can't find.

If you have any ideas or tricks of what my issue is please help! Thanks in advance. jason

  • mjw1

Posted January 14, 2010 - 07:23 PM

#2

Is your jetting stock? You might need a bigger pilot jet.

  • grayracer513

Posted January 14, 2010 - 09:11 PM

#3

Watch:

http://www.yamaha-mo...troke_vid_a.mpg

http://www.yamaha-mo...troke_vid_b.mpg

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Flanders87

Posted January 15, 2010 - 10:31 AM

#4

i watched those, thats how i started it when it did kick over.

  • Flanders87

Posted January 15, 2010 - 10:32 AM

#5

the jetting is stock as well.

  • grayracer513

Posted January 15, 2010 - 10:45 AM

#6

426's, and the 400's even more so, are extremely sensitive to correct pilot settings. Get it running, get it warmed up, then set the fuel mixture. It will help a lot.

http://www.thumperfa.../jetting.htm#PJ

http://www.thumperta...ad.php?t=327405





Related Content

 
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.