Yz426f hot starting problem


3 replies to this topic
  • MotoMatrix

Posted July 28, 2015 - 06:04 PM

#1

So I recently bought an '02 yz426f, and I've been able to cold start the bike no problem. But once the bike heats up a little (gets pretty hot pretty fast), and I turn it off, the bike refuses to start until I let it cool off enough to choke it. The hot start seems to do nothing. Any suggestions?

  • harmetp

Posted July 28, 2015 - 06:12 PM

#2

Do you still have a decompression lever?  It seems to work for me to kick a few times with the decomp lever pulled then kick it over (no throttle).  Some suggest next going to the hot start button.  Also, if I have my idle screw turned up so it idles fast, it starts much easier.  Once I'm going I usually turn the idle down a little so I don't run off the track.  Mine is a 01 yz426 w/hot cam exh w/autodecomp - still have lever.  Lots of folks say just get a rekluse then you don't usually have to worry about hot starting it because it doesn't stall.  I have a z start (not the pro) that I'm considering installing, but I'm not sure the older/non-pro type worked as nice as the newer versions (clutch lever feel etc).  



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

Posted July 28, 2015 - 07:10 PM

#3

Do you still have a decompression lever? It seems to work for me to kick a few times with the decomp lever pulled then kick it over (no throttle). Some suggest next going to the hot start button. Also, if I have my idle screw turned up so it idles fast, it starts much easier. Once I'm going I usually turn the idle down a little so I don't run off the track. Mine is a 01 yz426 w/hot cam exh w/autodecomp - still have lever. Lots of folks say just get a rekluse then you don't usually have to worry about hot starting it because it doesn't stall. I have a z start (not the pro) that I'm considering installing, but I'm not sure the older/non-pro type worked as nice as the newer versions (clutch lever feel etc).

I do have the lever still and am soon ordering a hotcam. I think I may need check the valves and maybe re-clean the carb.

  • grayracer513

Posted July 29, 2015 - 06:19 AM

#4

The carb is the single most common source of starting problems with the older 400's and 426's.  You have to get the idle jetted and trimmed out almost perfectly in order to have them hot start reliably.  The bike should only need the hot start for restarting immediately after it's stalled while running.  If it's been sitting for 5 or 10, it should restart without it.  An even slightly rich idle will make the bike difficult to restart when hot.







Related Content

Forums
Photo

First Hare scramble tips by dhend8


Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

James Stewart back on a YZ450F by YamaLink


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

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
 
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.