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XR400R with CR250 USD Fork

Posted: Mon Jun 06, 2016 11:58 am
by 4Strokes
Topic: Xr400 inverted forks ('89 CR250 forks)
Author: jignpig
Posted: 03/20/2006 2:41:17 PM

Will the 1989 CR250R triple tree with forks fit on a 02 xr400r? what about the front wheel and brakes? if the '89 forks work do you have to use the cr wheel or will the xr wheel work with the factory brakes? I want to put the inverted forks on my xr400r. Thanks, Lance

Reply by ThumperTDC on 03/20/2006 3:04:42 PM
First off, let me say welcome to the forum. Now to the forks. I am sure they will work, not sure if it is a direct bolt-on, or if there would have to be some modification done to make them fit. I would look and see if the steering stem bearings are the same part numbers. I know a '91 CR500 looked to be a direct bolt-on, even the XR front wheel should have bolted up to the forks. I had looked up all the part numbers and checked. I did all the homework, but lost the bid on eBay. That is how I ended up with the 2000 CR125 forks. Much more work to install the newer forks, but I am sure they perform better than the older ones.

Reply by jignpig on 03/20/2006 3:11:01 PM
thanks, the '91 will bolt right on with the factory Xr wheel and Xr brakes?

Reply by ThumperTDC on 03/20/2006 3:18:43 PM
The '91 CR500 has the same wheel bearing part number as the XR front wheel bearings, so I figured that using the CR axle the XR front wheel could be used with that setup. Not sure on the caliper, but my XR caliper fits onto my 2000 CR125 forks just fine.

Reply by jignpig on 03/20/2006 8:42:41 PM
Lost the auction by $2.00. Please keep your eye out for either 1989 cr250 triple clamps and forks or 1991 CR500 triple clamps with forks. Thanks, Lance

I will keep watching e-bay. I thought I had the auction won. I bid with like 20 seconds left and I was the high bidder and I still got beat by $2.00 I could spit nails right now.

Reply by ThumperTDC on 03/20/2006 10:32:53 PM
I found some '91 CR125 forks on eBay as well as the front wheel that goes with the setup. Did not see any clamps. When I did mine I had to buy everything separately, it was a pain, but well worth it in the end. If you have access to a local machine shop and are willing to pay some extra cash to has some machine work done, you could pick up a new set of forks had have the machining the CR stem down to fit the XR bearing, or have them do similar work like what I did with mine to adapt the XR stem to the CR clamps.

Reply by jignpig on 03/21/2006 03:23:58 AM
Thanks for the info, Have you seen the A-loop set up for the XR Kind of pricey but looks bad azz !
Once I get the front end done that will be next. I do have access to a pretty good machine shop where my brother works and could most likely get it done. Just got to find the correct set up.

Reply by RideRed on 03/21/2006 04:29:46 AM
Here's my 1997 XR250/300 with the ALoop kit:
Reply by ThumperTDC on 03/21/2006 09:13:57 AM
Since you have access to one, I would say go for a set of newer forks, they are going to be much easier to come by. You will need to find a complete front end, forks, clamps, axle, wheel, etc. If you are going to keep your headlight the best thing would be to use your XR front brake, if you are looking at a front number plate go with a CR front brake, or at least the brake line. The CR front brake line is about 5" shorter than the XR. I ended up using my XR front brake and it bolted right up without any problems.

Reply by bpoulter on 03/29/2006 04:02:11 AM
The 94 CR125 has the exact same size axle as the XR400. I have a '94 CR125 wheel as my MX and use my std hubs for 17" supermoto. The CR axle from that year differs from the XR in that it has a longer shoulder (no speedo drive) and a longer overall total length with a smaller thread for the axle nut. I was going to cut off the excess and thread the remainder and it would have been perfect, but the guy I asked to do it made a whole new axle instead. I'd go for a bit more pain and machining and get later forks they will handle better as the manufacturers are always adjusting and improving them.

Reply by wingman on 03/29/2006 5:58:16 PM
hey jignpig, giday eh! maybe i'm wrong but why would you want to put upside down forks on your rig? do the factory ones flex to much? I see on the forms lots of folks are doing it. maybe i am missing the boat but if my fork seals start to leak at least the fluid is not sucked out buy gravity. just a thought. wingman.

Reply by ThumperTDC on 03/29/2006 6:06:55 PM
The stock XR forks flex so much it is unreal. With a fork brace installed on the XR forks it helps with the flex, but there is still some flex. With USD forks the flex is gone, the bike handles so much better and best of all it makes the XR look bad ass, more like a modern bike.

Reply by wingman on 03/29/2006 6:45:58 PM
thanks thump , i will have to try an xr400 with them to feel the difference. wingman

Reply by cdndrtbke on 03/30/2006 4:23:41 PM
I have 1991 CR500 forks on my '01 XR400R which is the same as the '89s. here it is again for all to see. I know you've all seen it before but here it is again but with some Showa forks decals that i put on the other day.
Reply by XFarme on 04/10/2006 6:30:30 PM
ok. This is my next mod goal for my XR. Are there any CR or CRF forks that will clamp into the XR triple clamps or do I need a whole fork and triple clamp combo? What years triple clamps bolt on and what years will work but need modification?

TDC, what year did you use and what all did you have to do to make it fit? Do I need the CR front tire as well or will the XR tire work?

Reply by XFarme on 04/10/2006 6:46:15 PM
Looking at part #'s 90-94 CR500 has the same upper bearing # (242015-001) as the 04 XR400R But the lower on the CR is different (2491-001) And from looking at random others, CRF and CR's, all have the 2491-001 for both bearings. Am I wrong?

Reply by ThumperTDC on 04/10/2006 11:02:42 PM
To save on typing a lot, here is the post with all the info on my project.

Topic: XR400R Inverted Fork Project

Reply by atkxr600 on 05/15/2006 10:03:27 AM
I just bought a '91 CR250R parts bike for the purpose of doing this swap, I think I have a pretty good read on what I need to do. But I was curious if any of you guys are running the speedo cable, if so how is it routed. On the XR forks its clamped to the right fork leg, can it be lashed to the plastic guard on the slider part?

Reply by atkxr600 on 05/24/2006 05:10:48 AM
Well I think I have answered my own question, now that I have the forks on the bike, its pretty obvious that the speedo drive would be in harms way when the forks compress all the way. Also the XR axle will not fit in the CR forks. So I will be running the CR front wheel with my set-up.

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