03 450 forks on a 00 426...

11 replies to this topic
  • Zique

Posted July 15, 2006 - 08:49 AM


Can it be done. I've heard of a 426 to 450 conversion in regards to the front forks and was wondering what all that took. I need to replace my front fork tubes and can only find a bunch of 450 forks around. I can't afford brand new, so if I can get the used 450's and convert, that may be benefitial. Thanks in advance!


Posted July 16, 2006 - 07:59 AM


ill take a look on my microsfiche and see what needed to be done, but from what i can remember you would have to change the upper and lower triples, ill have to see if the bearings and races will line up. I ll check when i get to the shop today.

  • Zique

Posted July 16, 2006 - 02:04 PM


Cool. Thanks.

  • GreenKLX

Posted July 16, 2006 - 02:06 PM


I'm pretty sure that the '03 forks bolt right up with out any mods. Both are 46mm, and all of the clamps for the yz's say they fit through '03.

  • Zique

Posted July 16, 2006 - 02:30 PM


Are you sure? I thought the went up to 48mm w/ the 450's? The upper tube is different part numbers in the OEM search.

Funny thing, the 03 125 and the 00 426 are the same part # though? That doesn't seem quite right to me though. Aren't 125's a lot shorter bikes? I've never personally been on one (obviously), but it seems it would be set-up a lot differently since the bike is lighter and smaller.


Posted July 16, 2006 - 02:51 PM


Ok here is what I found, the part #s for the 00-426


5HC-23435-11-00 (replaces 5HC-23435-10-00)


now for the 03 450



now i know it only looks like part #s, but you have to realize that if the part #s are different, then that means something has changed. Now I could say that if the entire triple and forks were used with the proper race and bearings, I would say it is a definate yes it could work.

if your going to pull the forks off of a 03 and slide them into the triple of the 00, you might have issues. (not confirmed, i have not tried it, nor do i know anyone who has)

Ill ask one of my Tecs on wednesday when I get back to work, and see what they say.

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

Posted July 16, 2006 - 03:11 PM


They went to 48mm's in '04. Look at this thread

  • RCannon

Posted July 16, 2006 - 04:00 PM


Look at the aftermarket upper and lower triple clamps. Most companies show the same upper and lower clamp fitting anythign from 98-03. This includes the YZF's and the YZ's. The factory would give the part a new number if the color changed. The upper tube diameter was sligtly different in 97.

  • Zique

Posted July 16, 2006 - 06:21 PM


They went to 48mm's in '04. Look at this thread

Ah. Thanks buddy. That thread helps in a lot more than the original question as well. :thumbsup:

  • Zique

Posted July 16, 2006 - 06:25 PM


Are lengths different from the 125's to the 450's? Reason I ask is that a fellow in the next town over is selling parts off his son's 03 125. I might could get a good set of replacements. His son is about my weight and they had it all revalved and such for him.

  • grayracer513

Posted July 17, 2006 - 07:31 AM


He might be your weight, but his bike is 40-50 pounds lighter, so the springs would be wrong. The valving might work if re-sprung, but you don't know. I'm not certain as to length.

However, the '03 450, or any earlier model fork, back to 2000 at least, should slide into your clamps.

  • Zique

Posted July 17, 2006 - 12:20 PM


That's what I was worried about. Thanks gray!

Related Content


Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

YZ450F 03 Sparks driving me crazy by SirAttard

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