what is the top speed of a 450

11 replies to this topic
  • DTM Industries

Posted April 05, 2011 - 11:42 PM


I have a 2006 YZ450 im wondering what is the top speed "MPH" on this bike?
If any one has toped it out what was you best all around gear slection ( spocket size front of rear ). Im setting this bike up for desert racing & besides changing out the trans gears with WR450 gears what would the all around spocket sizing be best for desert racing- TOP SPEED & TIGHT SECTIONS ?

  • primerib108

Posted April 06, 2011 - 05:08 AM


My 06 was clocked last year at 141km/h (84 mph) when running side by side with my buds WR who had a speedo. My sprockets were 13T front and 50T in the back......now I have a 49T in the back so I'm sure I could squeeze a couple more MPH.

All be it we were flying down a gravel road so there was a little wheel spin and I don't know how accurate his speedo was so this is more an estimate than actual.

  • grayracer513

Posted April 06, 2011 - 08:21 AM


I run desert races with my '06, and I run it at 13/48. I also run a Rekluse Z-Start Pro clutch which helps enormously with the tight stuff and the "little surprises" some of the D38 clubs like to toss into the mix. It's more expensive than a WR trans (which is an excellent swap, BTW), but it's much easier to install.

With this set up, I run out of gear only on the fastest lake bed sections, and it would be nice not to have that happen, but it's not a real big problem. Not so many of those sections included usually. Mainly, I don't like running it at 10K with the throttle rolled back for a quarter mile at a time.

I suppose, with the Rekluse, I could get away with a 47 or something like 14/50, but it works well enough for me as is that I'm not strongly motivated to address the matter.

  • jacobdewey

Posted April 06, 2011 - 10:22 AM


On my 2008 with stock gearing 88mph on a paved road as per my gps. If i would of had the flux capaciters working i could of gone back to the future!

  • YamaLink

Posted April 06, 2011 - 11:52 AM


Not quite the reply you're seeking, but after this weekend the stock geared YZF is dead even with our late 80s CR500 which has absolutely no over-rev (where is that larger main jet??). Feels like a 4000rpm redline. :cheers:

  • Sharp Shooter

Posted April 06, 2011 - 07:25 PM


My stock 2006 YZ450 ran a consistant 86 on Soggy dry lake bed in Johnson Valley using a hand held GPS. Weather was Cooooold!!!

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  • yz450fcranker

Posted April 06, 2011 - 07:27 PM


15-50 near 100mph gravel not good for tight sections though

  • yz450fcranker

Posted April 07, 2011 - 11:26 AM


I have tried 13-49 13-50 and 15-50 i think 14-50 is what i am going for next because the bike just doesn't hit the rev limiter with 15-50 so i would recommend 14-50 also with a 15 tooth front you have to remove the case saver

  • kjosh1982

Posted April 09, 2011 - 12:44 PM


My 09 tops at 88-89 with stock sprockets on pavement. Speed was recorded with hand held GPS, double checked with gps on my phone. Phone had it at 88mph

  • brentn

Posted April 09, 2011 - 12:47 PM


I was getting I believe 120kph with 13/50 if I remember correctly..

  • roofer dude

Posted April 11, 2011 - 04:52 PM


16/23 gear 107 on radar gun!! Not hitting rev limiter! What a ride.

  • grayracer513

Posted April 11, 2011 - 08:28 PM


For those who think the bike will go faster if it's geared to hit the rev limit, bear in mind that the bike makes upward of 4 more horsepower at 10,200 then it does at 11,500.

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