best mod for throttle response of 400

2 replies to this topic
  • bonehead7101

Posted January 26, 2012 - 08:08 PM


I have a 98 400f and have been reading through the mods, and wondering what is best to eliminate the bog under quick acceleration, I have already jetted carb, but it seems like no matter what I do it still has the bog. Only time I notice it is when I'm log/rock hopping and i need to blip the throttle. I have a zip ty but no quickshot.

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  • RasmusDK

Posted January 27, 2012 - 02:15 AM


A newer carb do the trick. I put a 2008 on mine, it runs perfect.

  • grayracer513

Posted January 27, 2012 - 08:08 AM


Try this:


Ultimately, though, a carb from an '05 or newer 450 is the best fix for the old 400.

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