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1976 YZ125X Front Wheel- Forks issue

  • Grussell
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1976 YZ125X Front Wheel- Forks issue was created by Grussell

I am getting close to the finish line with my 125x. I installed the front wheel after mounting the tire. The wheel is too close to the right fork and the tire rubs on the boot. Last year I bought this 125x, 2 yz 125c and a yz100c. I have tried all 4 wheels and the issue is the same. The tubes are not bent things are set on the top triple clamp and the axle slides in easy. I verified all parts are there from the diagram. I am stumped and need help. Anyone ever have this issue pop up on a build?   
1978 DT400
1975 DT250
1976 YZ125C (in progress)
1976 YZ125X (in progress)
2018 YZ250FX (my race bike)

22 Jul 2021 10:00 #1

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Replied by Mothersbaugh on topic 1976 YZ125X Front Wheel- Forks issue

Just a shot in the dark, but do you have the #27 spacer on the correct side? Seems if it were on the left, it would be pushing the whole unit to the right. Belongs on the right side...
22 Jul 2021 11:30 #2

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  • Grussell
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Replied by Grussell on topic 1976 YZ125X Front Wheel- Forks issue

Yes the spacer is on the right. The brake backing plate is the only thing on the left.
1978 DT400
1975 DT250
1976 YZ125C (in progress)
1976 YZ125X (in progress)
2018 YZ250FX (my race bike)

22 Jul 2021 13:56 #3

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Replied by SKYDANCER46 on topic 1976 YZ125X Front Wheel- Forks issue

After my 1st post, i see you covered most everything i mentioned. If your sure you have all the correct spacers and wheel components on the bike then my 1st guess would be a bent inner fork tube or axle. If you loosen the axle nut and axle holder on the right fork does the right lower fork leg stay put or does it want to spring in or out from the wheel. You said the inner fork tubes are straight. For kicks try rotating them in the triple clamps while watching the wheel mounted and loose. Does the clearance change at all? Can't think of anything else.
I did have that same problem on a Yamaha Enduro once and it ended up being a bent inner fork tube on that bike. 
Last edit: 22 Jul 2021 16:27 by SKYDANCER46.
22 Jul 2021 16:26 #4

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Replied by Grussell on topic 1976 YZ125X Front Wheel- Forks issue

I will give it try. I check the tubes on my kitchen granite counter top when my wife was at work before I assembled the forks.
1978 DT400
1975 DT250
1976 YZ125C (in progress)
1976 YZ125X (in progress)
2018 YZ250FX (my race bike)

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22 Jul 2021 16:44 #5

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Replied by Grussell on topic 1976 YZ125X Front Wheel- Forks issue

Rotated the tubes, made no difference. If I loosen the pinch bolts the forks don't move. The backing plate is flush against the left fork. Here are close up pictures of each side.

  
1978 DT400
1975 DT250
1976 YZ125C (in progress)
1976 YZ125X (in progress)
2018 YZ250FX (my race bike)

22 Jul 2021 18:57 #6

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Replied by RT325 on topic 1976 YZ125X Front Wheel- Forks issue

Could the wheel have been mistakenly re-laced over too far earlier in its life & the other wheels you tried sit over further in the bike 'they' belong to with a different brake plate & triple clamp width. Can you whiz a bit off the brake plate where it meets the axle lug as an easy fix or is the brake anchor pretty much bottomed out in the plate,--could shorten that a bit too i guess & still be safe. Could loosen 'all' the spokes & try to build it over tightening & truing if there's enough thread to play with. If the spokes are free to move, & won't be if anything like my old bikes.
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22 Jul 2021 19:03 #7

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Replied by Grussell on topic 1976 YZ125X Front Wheel- Forks issue

I compared all of the front wheel parts on the Yamaha parts diagram and the only parts that are different are the lower forks and the backing plate. The X uses the backing plate 322-25121-00-98 and the C uses 483-25121-00-98. Interesting that the C backing plate is Magnesium and the X is Aluminum. I measured the axle bushing in the backing plates and the X is about .5mm thinner. I tried the other 2 wheels and with both backing plates and they look the same. So I have all of the correct parts, just not picking up on something. I am leaving this afternoon for a 12 hour team race tomorrow, so I will take another look at the front end on Sunday.
1978 DT400
1975 DT250
1976 YZ125C (in progress)
1976 YZ125X (in progress)
2018 YZ250FX (my race bike)

23 Jul 2021 09:07 #8

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Replied by SKYDANCER46 on topic 1976 YZ125X Front Wheel- Forks issue

Grussell,

There was a real nice 76 YZ125X strapped into the back of a pick up truck in the parking lot of Mid-Ohio today. So i went up and took a look at it. It's no different then your bike. The wheel is off center and the tire was super close to the fork boot on the right fork just like yours? Only difference was i don't think it had as aggressive knobby tire like yours. More like a older vintage knobby (small close knobbies) so it wasn't rubbing but damn close. Maybe that's just how these 76 YZ125X's are? 

There was no one around so i couldn't ask any questions nor did i want to have someone think i was stealing the bike so i just eye balled it from the rear but could clearly see the off set and the clearance difference. 

What size tire do you have on your bike? maybe try a different style knobby with less aggressive side knobs?


2nd thought, Maybe it was you? were you at Mid-Ohio today? 
 
Last edit: 24 Jul 2021 17:18 by SKYDANCER46.
24 Jul 2021 17:14 #9

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Replied by RT325 on topic 1976 YZ125X Front Wheel- Forks issue

Not right though is it. Probably not notice it riding but just a worry--& people go, Oh look!! if looking closely that is.
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24 Jul 2021 17:25 #10

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