Will a yz450 carburetor fit a yz400

4 replies to this topic
  • toolman90503

Posted July 01, 2008 - 09:05 AM


I have recently purchased a 98 yz400f and have cleaned the carberator. I can't seem to get the lag out of the off idle throttle. I am considering a newer style yz carb or an edlebrock. It is much cheaper to go with a used Keihin carb off a newer bike. Does anyone know or have any experience with this swap?

  • grayracer513

Posted July 01, 2008 - 10:57 AM


It seems to me there have been some people do this. Use the advanced search and see if you can find something on it.

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  • SXP

Posted July 01, 2008 - 01:11 PM


Here's one for starters: http://www.thumperta...ad.php?t=639019

  • toolman90503

Posted July 01, 2008 - 05:02 PM


Thanks for the input. Now after reading that thread, more question come to mind. It can't be that much shorter, how much? I know I have some play in the boot but I don't want to put too much stress that would cause it to slip off or come loose while riding. Have you had any problems? Also the intake side has a slot to center the carb upright is there any conflict with the newer carb? I sure would like all the features of a new carb, any input would be greatly appreciated.

  • SXP

Posted July 01, 2008 - 05:19 PM


It will line-up/bolt right up with the existing engine side boot. As far as stretching the air box boot we are talking about 1/4-1/2 inch (maybe less). You will need the correct throttle cables, hot start cable and handle-bar lever. That's it. I've had absolutely no issues thus far.

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