1999 WR 400 Improvements:

2 replies to this topic
  • Yamafun

Posted March 25, 2008 - 11:19 AM


Hey guys -
I have a '99 WR 400 (stock), and I'm trying to 'beef up' - any ideas on what there is to do in a cost effective way? Exhaust? Jetting? Really just looking for some more HP's. Any ideas would be very helpful! Thanks.

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  • doctorchopper

Posted March 25, 2008 - 01:54 PM


yz timing, find a cheap pipe on ebay, plan to repack it though,

  • maxtherat

Posted March 25, 2008 - 06:17 PM


Grey wire, throttle stop, open the air box, and unplug the exhaust. Follow that up with cam timing and then rejet last.


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