650R USD Fork valving/spring set up
Posted September 27, 2006 - 12:30 PM
Fast intermediate hs woods/ midpack expert desert racer... (Faster in the desert...slower in the woods.)
I want to set these up to be plush when just DS around but able to add some clicks to make them soak up the large g outs when racing or hauling arse in the desert.
Bike: y2k. BRP 650R
Acerbis 6 gallon tank and ds/rallyed out
stock bore, stage 1 cam.
uncorked and race exaust.
rear shock racetech. heavy spring set up for my weight and speed.
Posted September 27, 2006 - 01:40 PM
Posted September 27, 2006 - 06:43 PM
Here's the link to modifiying the CRF clamp to fit. http://home.comcast.net/~ledrocnoc/CRFClampMods/
when you look at the emig pricing, it's very compairable to the Scotts UTB
mount upper clamp at $750 retail
hell it's all pretty pricey. but.. since I need new fork parts to keep the oems going, I might as well spend the money to do this mod and get what I want.
Any other tips that you guys have would be helpful
Posted September 28, 2006 - 12:10 AM
The above link for the triple tree swap is a good'un.
Posted September 28, 2006 - 08:20 AM
I have had zero problems with this set-up. I did need a CRF front wheel, acutally just hub and axle would work. But the Xr stock caliper bolts right on to the fork.
Now for the cons. For super moto, or even agressive street riding this is the cats pajamas. However, for high speed offroad, I do prefer the stock forks much better. I believe this is due to greater trail on the stock clamps. In tight trails this set-up works fine and the bike jumps amazingly well for what it is.
I think if I can figure out a scotts damper, I could have the best of both worlds. Just not real sure how to mount one. Maybe a CRF upper clamp and XR lower mount, but that would block my dipstick, any suggestions?
Posted September 28, 2006 - 08:41 AM
I don't know everything, but what I do have is bearing sizes for the top and bottom of the steering stems. I don't have steering stem lengths.
All years of the XR650R uses 26/47 (ID/OD in mm) bearings for the top and 30/52 for the bottom.
'91 through at least '05 CR250R use 30/52 top and 30/52 bottom.
'87-'01 CR500 use 26/47 top and 30/52 bottom. .41 springs ('95 on)
'04-'06 CRF250R use 30/52 top and 30/52 bottom. .45 springs
'02-'06 CRF450R use 30/52 top and 30/52 bottom. .47 springs
There is a 32906 bearing that is 30/47, which means that using this bearing at the top and a stock bearing at the bottom, a CR250 front end will bolt up. Keep in mind, I DON'T KNOW the steering stem length.
Just as a note, all years XR650L use 26/47 top and 26/47 bottom.
If people want to help me with my research, I'm looking for steering head lengths for the following bikes ('88 to present) - Honda CR125, CR250, CR500, CRF250R/X, CRF450R/X, XR100, XR200, XR250, XR400, XR600, XR650L,R, Kawasaki KX125, KX250, KX500, KLX250/300, KDX200/220, KX250F, Suzuki RM125, RM250, RM250F, RM450F, DR250/350, RMX250.
If I know the steering head length, I'll have a pretty good idea if the stem length is right.
Sorry, I'm not doing Yamaha... I don't have any, and I don't recall that they are particularly noted for their front ends.
PM me with what ever info you have and I'll fill in the charts.... Thanks!
Posted September 28, 2006 - 09:24 AM
Posted September 28, 2006 - 12:01 PM
Posted September 28, 2006 - 12:56 PM
Also, some be wondering why go through this if you can spend less on having the factory forks slicked up... Well, I bent mine in the grill of a car going 55 mph. I got the 450 forks, triple tree, front wheel with black excel and rotor, and axle for $300.
Posted September 28, 2006 - 09:40 PM
Good stuff guys you may have saved me a packet of moolah.
Posted September 29, 2006 - 02:30 AM
I found a 1991 CR250 with a bad motor for $200, took the complete front end from that, and swapped it on.
What I found is that the distance between the upper and lower triple clamps is identical, the top bearing on both bikes is the same. But the lower bearing on the CR is larger. The top and bottom bearings on the XR6 are identical.
So basically I needed to use the XR stem and bearings, on the CR clamps. To accomplish this, we made a sleeve to install on the XR stem, where it presses into the lower clamp. In effect the sleeve increased the diameter of the XR stem allowing to be pressed into the CR lower clamp.
Then the XR bearings were used. It was a bolt on from there. The steering stops need modifying, as the upper clamp bolt heads hit the tank at full lock.
The stop embosses on the lower clamp will be drilled and tapped, and a bolt installed. Then the bolt will contact the frame stop, allowing full lock adjustment.
My garage has pics of the frame with the forks installed.
Posted May 09, 2007 - 06:16 PM
Can anyone tell me where I might be able to find this bearing? Does it really exist? A quick internet search didn't turn up anything. I just bought a complete front end off an '04 CRF450 and I have a set of SCOTTS triple clamps that I'd like to put on my 650R, but if there's an off-the-shelf bearing that will work I'd sure like to know before I do any machine-work on the upper triple clamp.
There is a 32906 bearing that is 30/47, which means that using this bearing at the top and a stock bearing at the bottom, a CR250 front end will bolt up.
Posted May 10, 2007 - 05:34 PM
Posted May 14, 2007 - 12:14 PM
Posted May 15, 2007 - 10:04 AM
If you are putting on a newer CR or CRF front end you don't need to swap the stem. Call a guy named Rob at this place www.evolutionsuspension.com . He has the upper bearing and race to make the CR or CRF trees work. The lower is the same as the 650's so all you need is the upper. I think there is a different washer to go with it too. Ask him about that also. $60 for bearing and race. Pop out your old race, install the new one with the new bearing, then just grind the steering stops on the lower tree to get your desired turning radius.
Posted May 15, 2007 - 10:44 AM
Posted May 15, 2007 - 11:48 AM
Posted May 15, 2007 - 01:39 PM
Posted May 16, 2007 - 12:03 AM
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