top speed of YZF's

7 replies to this topic
  • Shane_Bettin

Posted February 27, 2005 - 04:25 PM


well i clocked my yz400f today on the river on the sled drag strip at 140 kph. it was a sled that clocked my speed, not the most accurate but thats the only way i could find out. so im given it about 10 kph either way. ive pretty much got stock jetting, just the jd needle and bigger main, TA pipe, twin filter, 03 exhaust cam. those are the mods just for the record. of course tires are studded up. whats the average top speed of a yz450? i plan on upgrading to one but i want a fast bike for the winter. for anyone with both blue and red experience, is there a big diff. between the 4 speed and 5 speed, power delivery and top speed.

  • yzf450jack

Posted February 27, 2005 - 05:53 PM


Thats about 85mph are you sure :)

  • 642MX

Posted February 27, 2005 - 06:37 PM


I once read somewhere that a stock 426 with stock gearing would run 86MPH. I don't know if that's true, it seems too fast.

  • odlaw19

Posted February 27, 2005 - 07:48 PM


86mph is approx 138kph.... i would think thats about right.


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 02YZ426

Posted February 27, 2005 - 08:16 PM


I had my 02 YZ426 studded last winter and only got 70mph on radar, although that was not in perfect conditions. After I geared it up a bit, I had it doing 100mph no problem. I wont run it on the ice anymore though....I gets to be hard on the bike after awhile. Towards the end of the winter I found that my clutch basket was really beat from running wide open all day. I had to replace it with a Hinson basket. 5th gear also jumped out causing the shift fork in the tranny to bend. So to fix it right I had to change 5th, 3rd and the fork. Overall it was an expensive winter. I dont know if it was a bit of bad luck or what but I wouldnt recommend running wide open on the lake all the time.

  • Shane_Bettin

Posted February 27, 2005 - 08:55 PM


ive gotten 2 winters and a summer out mine so far, still runnen strong. like i said a sled may not be that accurate at all but i did 5 runs and they were all around 140. i even rode the guys sled ad he was on my bike because i didn't believe him the first 2 times. it was 140, 135 140 140 135. but give or take 10 kmh.

  • 02YZ426

Posted February 27, 2005 - 09:01 PM


If you are running stock gearing, I would say your bike is running what it should.

  • grayracer513

Posted February 28, 2005 - 10:10 AM


With stock gearing, and assuming no tire slippage (which isn't realistic) and that each could hit the rev limit in top gear (which they can), a YZ450 and a YZ426 will both go about 88 and 94 mph, respectively. I've geared mine up two teeth, and it now has a "paper" top speed of 91.5, and I've seen 89.7 on pavement with a GPS. 140kph (86.8) is believable.

Related Content

WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.