YZ426 Gearing

6 replies to this topic
  • nz_farmboy

Posted September 10, 2007 - 04:27 PM


Hey guys I have a YZ426 and want to swap 5th gear for the WR ratio....my local dealer said it cant be done but ive been told by others it can...Does anyone have any definite info?

Any help greatly appreciated

  • grayracer513

Posted September 10, 2007 - 04:52 PM


Yes, you can do that. All that is required is the 5th gear pair from the WR426 (5th pinion and 5th wheel). The jump to fifth will be a bit hefty, since the 4th ratio is slightly lower in the YZF than in the WR also (1.09:1 vs. 1.05:1)

  • nz_farmboy

Posted September 10, 2007 - 04:59 PM


Thankyou for your help, would i be better to use a wr 1st gear and go with bigger sprockets?is that possible?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted September 10, 2007 - 09:04 PM


Changing low gear requires changing the main shaft because the low pinion is cut on the shaft itself. Here are the ratios:



You can mix them up more or less as you like. You can do a mathematical evaluation to decide what combination you might like best. Give some thought to the limits of available rear gearing as you plan.

  • nz_farmboy

Posted September 10, 2007 - 09:10 PM


I have had a quote from my local dealer, roundabout $400 aus for parts and whatever labor on top, thats for 1st and 5th, I may just start with 5th and go a bit smaller sprocket wise...

Im really out of my leauge with ratios etc, I just get on it, start it, and enjoy the ride...

I really appreciate your help on this thankyou for your time

  • grayracer513

Posted September 10, 2007 - 09:32 PM


Well, 5th in the WR is 13% higher than the YZ, so that would be roughly like going from a 49/14 to a 49/16, or a 46/15. OTOH, the WR low gear is 36% lower than the YZ, and for that, you would need a 61/13 to get the same ratio.

  • nz_farmboy

Posted September 11, 2007 - 12:27 AM


Have ordered a WR 1st gear and flywheel, hope this is the right choice time will tell,

Thankyou Gray for your much appreciated and knowledgable help

Related Content


The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

BIGBORE FOR YZ450F 2006? by Taattie94

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

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 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.