How can I get more top end power?

11 replies to this topic
  • onelik

Posted June 08, 2011 - 10:56 PM


So I bought a 2011 yz450f and I read many reviews on the 4th and 5th gear being flat so I'm trying to figure out how I can get more 4th and 5th gear power for those long wide open desert rides

  • onelik

Posted June 08, 2011 - 10:59 PM


forgot to mention this bike has a serious hit in first second and 3rd gear it responds excellent with the twist of the throttle

  • yz450fcranker

Posted June 09, 2011 - 03:48 AM


go downilll on 4th and get it to redline and shift to 5th it should be going pretty smooth lol get an exhaust pipe a k&n filter and a 50 tooth rear sprocket

  • grayracer513

Posted June 09, 2011 - 06:47 AM


The OEM muffler seems to be the limiting factor on the '10/'11. They use a sudden reduction in diameter at the end of the outlet as a noise cheat, and it ends up clipping power on top. The header, OTOH, seems to be just fine, so a well made slip-on is usually enough.

  • onelik

Posted June 09, 2011 - 09:49 AM


what kind of slip on do u suggest

  • Aicon YZ450F

Posted June 09, 2011 - 09:58 AM


I put a FMF GYTR on mine and it opened up the top a little. If you don't mind spending a extra few bucks put on a yosh

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  • grayracer513

Posted June 09, 2011 - 10:05 AM


MRD, Yoshimura, ....

  • APlusAutoParts

Posted June 09, 2011 - 12:25 PM


i have a 50t rear sprocket and pro circuit exhaust and mine hits better on top now

  • Steel Panther

Posted June 09, 2011 - 03:32 PM


are you looking for more "hit" at the top of the rpm range or more speed?

  • onelik

Posted June 09, 2011 - 07:19 PM


More speed.

  • Steel Panther

Posted June 10, 2011 - 12:00 AM


if your looking for more top end speed a slip on exhaust may help a little, but gearing is the way to go. Try going down a tooth or 2 on the rear sprocket size.

  • Duner185

Posted June 10, 2011 - 12:39 PM


If i was buying a new exhaust i would go with the FMF they have great top end one of the cheapest places i found my is at this web site. here is a link then in the search type FMF

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