need help quick please

7 replies to this topic
  • mxracer32

Posted April 06, 2004 - 04:22 PM


i have a 1999 yzf400 and i just reset the time and its right i think cause it will run but when it start it backfires alot but it wont do it if u leave the choke on and also when u turn the choke off and keep it at a high idle it will run then when u let off it will die like it has ran out of gas. any thing will help thanks

  • Fastest1

Posted April 06, 2004 - 04:47 PM


When you say you "just reset the time" what do you mean? Cam timing or ignition timing? I actually suspect a dirty carb, but I would really like some answers. When was the last time it was running? What happened that made you change something? Fresh gas? plug?

  • mxracer32

Posted April 06, 2004 - 04:58 PM


it was the cam timing and i reset it cause i put new rings in it and piston and i got a new plug and fresh gas in it to. but i dont get y it dont do it when i keep the choke it runs fine. its been about 2 months since it was ran.

  • Fastest1

Posted April 06, 2004 - 05:03 PM


Are you saying it only runs with the choke on? or off?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • gfergtr74

Posted April 06, 2004 - 05:03 PM


Check and clean the carb. The problem is probably there.

  • mxracer32

Posted April 06, 2004 - 05:08 PM


when i go to start it i turn the choke on and it starts and then it will run just fine then when i go to turn the choke off it will start to backfire and want to die out.

  • yamaha.dude

Posted April 06, 2004 - 06:03 PM


The old "upside-down-slide-in-the-carb" trick?


  • sirthumpalot

Posted April 07, 2004 - 01:34 AM


YOu said it has been 2 months since it was run. Did it run OK before the 2-month wait? If yes, then clean the carb. If you are not sure or you did not run it before putting it away for storage then check the carb slide as suggested above, re-check the cam timing and valve clearances, clean the carb and let us know the result.

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

Megabomb Fitment by 288yz450

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

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

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

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.