YZ426 front alignment


7 replies to this topic
  • BASSic

Posted January 01, 2008 - 03:40 PM

#1

I just picked up a 01 YZ426. The previous owner took a hard fall on the right side, as I can see the radiator is slightly bent (no cracks or leaks though). The previous owner told me about this fall, where he bent the handlebars and ended up putting new TAG bars and a upper triple clamp to fix it.

I noticed that the fork tubes aren't aligned properly. Could the lower triple be bent, or is it possible that I just need to loosen the clamps and re-align everything? How do I go about doing that?

  • grayracer513

Posted January 01, 2008 - 09:05 PM

#2

Loosen the pinch bolts on either the lower or upper clamp, but not both. The wheel may return to its correct position by itself upon loosening the bolts, or after bouncing it with the front brake on a couple of times. If not, see if you can force it back into line by turning against a stationary object. If it doesn't go back where it belongs easily, or won't stay there unless you tighten the pinch bolts while the pressure is on, then something in one of the fork assemblies is bent.

  • BASSic

Posted January 13, 2008 - 12:47 PM

#3

I took your advice and it worked like magic! The forks are now aligned.

I loosened the lower triple clamps and the axle clamps, gave the bars a gentle twist, then bounced on the front wheel. It's all back to normal now.

The only thing I noticed is that the inside of the axle (between the right fork and the wheel) looks like it has a machined groove that isn't flush with the inside of the axle clamp. The end of the axle is flush with the axle clamp on the outside though. This may have been like this before I loosened anything, but I didn't notice it.

  • grayracer513

Posted January 13, 2008 - 02:03 PM

#4

The only thing I noticed is that the inside of the axle (between the right fork and the wheel) looks like it has a machined groove that isn't flush with the inside of the axle clamp. The end of the axle is flush with the axle clamp on the outside though. This may have been like this before I loosened anything, but I didn't notice it.

Can you move the wheel side to side on the axle?

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  • sherco67

Posted January 13, 2008 - 04:29 PM

#5

I have this same problem on my 06 yz450f after changing tire, with everything adjusted and torqued up the right side of axle sits in about 3/16 of an inch inside fork tube, rode on saturday and seems to be fine, can't remember if it was flush before oe not.

  • BASSic

Posted January 13, 2008 - 05:25 PM

#6

I can not move the wheel side to side on the axle, it's tightened up and everything is fine.

The ends of the axle are flush with the ends of the axle clamps on each side.

The part of the front axle that is held by the axle clamps (at the ends of the axle) is slightly smaller diameter than the rest of the axle. The end of the axle is flush with the axle clamp, but on the inside between the fork and the wheel this smaller diameter is machined a little further inward and is not flush with the inside of axle clamp.

A picture is worth more than the thousand words I just typed and would easily describe what I'm trying to say. Unfortunately the bike is at my brother's house right now because he has a heated garage where I'm doing my work.

  • grayracer513

Posted January 13, 2008 - 05:40 PM

#7

It's probably nothing to worry about. There is, however, a right way to tighten the axle:

http://www.thumperta...769#post4290769

  • MX1967

Posted January 13, 2008 - 08:06 PM

#8

You can also spin the front wheel fast while your clamps are loose & grab the brake hard a couple of times. This will re-align the wheel in a snap! I also loosen both upper & lower clamp pinch bolts when I do this.





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