cr80/kx80 suspension on xr100?

im finding all these xr 100's on google that have some sick suspension from a kx or cr 80. heres a couple pics for examples

it looks like if you just buy the forks and clamps from the cr80 then it will bolt right up to the xr100 frame. the only thing im not understanding is the shock, the shock on the cr80 is like 1/3 longer than the xr100 shock. does that mean i would have to cut off the stock shock mount, then weld it a couple inches higher to work with the cr80 shock? also can you use the stock xr100 linkage or do you have to put the cr80 linkage on it? i can see in one picture it has the stock swingarm but in the other picture it has the 80 swingarm

im thinking some older cr80 forks like the same year as my xr (1996) would just bolt right into my xr100 clamps right?

The top pic is a CR80/85 fabbed to hold a XR100 motor. It looks like a DMC conversion. I can't tell on the bottom pic if has a TK link or not, but it probably has work done to the stem on the forks.

i was reading a little bit about the stem on the forks situation, what has to be done?

kinda funny i was just going to start a thread on putting a cr85 shock on a 100 i haven't been to concerned about the suspension on my 100's cause i only ride TT and supermoto, and i just cant bring myself to buy a works shock, but i have taken one of them to some real mx tracks in the past and its not real fun riding a pogo stick

ive got both bikes 85/100 and have done some quik measurements , and i think its doable .

my thought is removing the shock tower off the 100 and fabing a new mount to the bottom of the sub frame, ive looked at alot of different options , but all stopped me becuase i coulnt find a replacement spring for my weight, but i saw bbr for one makes a spring for the cr shock , so it looks like my project is a go:thumbsup:

yeah moving the shock mount to the top of the frame/subframe is no big deal at all. the only thing im not sure about is that im a 150lb novice mx rider and i think even the bbr spring will be too soft for me. but again who says i need to ride it as hard as my 250 right. anyways how bout you start the chop shop and see how that goes and if it works for you then im gonna do it!

i just need to check the clearences before i go chopping the stock tower off, and find out its hitting somewhere else , but on a side note the bbr spring is 6.4 that handles a 200 pd rider according to the racetech web site so that spring definatly wont be soft

yeah im 150 so a 150 novice mx should be perfect with the 6.4

so yeah the spring plus the cr front end should go perfect huh.

Keep in mind that the XR80/100 shock linkage ratio is not the same as the CRs80/85. The stock XR spring is about 650lbs= 11kg! The BBR adult spring for the stock XRs shock is 975lbs= about 17.5kg. Also, because of the linkage ratio- the stock XR (shock) have very little throw (about 1.5") the CR80/85 has about 3x that.

Some Food for thought.

AAAhhhh....Gman ,I figured somthing would come up im not that lucky , ive been running a kx front end with good fork springs and a stock rear shock w/bbr spring and like i said ive been pretty happy with them like that ,on TT/supermoto type stuff ,of which i ride 90% of the time, but i wanted to switch one of them over to the cr shock /BBR spring so it would work better on mx .

so explain to me what the differnt ratio linkages would affect? i do have a Tk link on them that raised the rear , basicly i look at it like this , i get to fab on the bike :blah: and spend upto 200 instead of 400 for a works ,on a bike that i already have to much money in .....:thumbsup:

just less travel right?

i believe what hes saying is the linkage arms arent as long as on the cr. which means less travel and a faster stroke (kinda) this is sounding like a lot of trouble now eh

It is tough but the works shock makes the xr swingarm and linkage work.There still isn't a ton of travel, but enough.With cr85 forks shortened to a similar stroke, maybe 7 or 8 inches.Buy the shock(I found mine on ebaay)Find a donor front (wheel and brake) end.The stem is available for around $130 makes it a bolt on deal.

When I ride mine as a flattrack bike I run 16 wheels on both ends.As big mini/woods I use the 17 front/16 back.We have a xr80 I've been wanting to try 14/16 combo on my xr100 .

You prob know but,if your jumping your xr and don't have a frame cradle.Bad things happen!


Saw this in the suspension forum not to long ago.


llength A does almost the same as the length of the rod. it mainly affects progression.

longer means less progression.

length B mainly affects the shock/rear wheel ratio

shorter means the spring/valving has to be stiffer.

This pic in a KXF450, all tho not a CR85 linkage they share the same principles

Notice the TK link (and the XR) linkage length in B.


the raymondguy did you ''have'' to flip the swingarm over to make it fit , or did you do it to make it taller?

That's the CR80 swing arm in the XR frame. The link needs to be flipped to center the shock into the XR frame; swing arm mounts traditionally.

too much is going on

hey ray what year swing arm and shock is that and are you using the xr100 or cr80 linkage?, have you tested it out yet does it ride good?

hey ray what year swing arm and shock is that and are you using the xr100 or cr80 linkage?, have you tested it out yet does it ride good?

Front & rear suspension is 1984 CR80R. The shock is in need of overhaul, but still feels more substantial than the stock 98 XR100 piece. As mentioned earlier in this thread, a frame brace is in order before any serious riding occurs. I haven't had a chance to ride it yet, but it's got to be light years better than stock (on rough stuff, the stock setup actually handles quite well on light trails etc., being so low slung).

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Honda Dude1997
      I have a 1997 xr200r I am currently doing a mild rebuild. I found a set of forks on ebay but I have noticed that the rear shock is not readily available like the forks. Is there an alternate route that I could take that would work with my bike? 
    • By spezza-125
      Anyways so I got a 1985 xr200r RFVC, and I have heard that the oil really overheats and in some cases people have had their bike (Rarely) go up in flames, however I don't want to take any chances and I heard that there is a way to put on some sort of oil cooler... How do I do it??
    • By Yamiha
      I have a '01 XR200 and i was wondering it anyone could give me a top speed for it. Where i live its more 2 lane highways and things so i cant find a good straight to run it with a car in. Thanks
    • By Quick Draw
      I decided to compile a list of common modifications for the XR200 in hopes of eliminating some of the common questions asked on this forum. These modifications are intended to improve the overall performance of the bike, without sacrificing reliability. Feel free to suggest amendments or things to edit.
      The XR200 is an excellent offroad machine; however, it was for the most part obsolete about 20 years ago. The bike can still be accredited to having probably the best reliability of any full size bike out there. When properly setup and modified, the "little XR" can run with the modern big bikes, especially in the tight and nasty technical terrain.
      INTAKE: Remove the airbox snorkel on top of the airbox. It just takes a little prying and it's out. For $20-$40, you can get an aftermarket filter (UNI, TwinAir, No Toil), that will help increase airflow. Rejet one size up on the main and pilot.
      Here are the stock jetting specs to give you a basline:
      Stock jetting
      XR200 (not XR200R)
      main 102
      pilot 35
      Needle position 3rd groove
      Pilot screw initial setting 1 3/4 turns out
      XR200R (81-83 only)
      Main 138
      Pilot none
      Needle position 3rd grove
      Pilot screw initial setting 2 1/2 turns out
      XR200R (86 and later)
      Main 112 (86) 110 (87 and later)
      pilot 38 35(98 and later CA only)
      Needle position 3rd groove
      Pilot screw initial setting 1 1/8 turns out
      When these things are done, the bike will breath much better. This is the single greatest modification for a bike ridden at high altitude.
      Overall cost w/out filter: about $10 for jets; $20-$40 for the aftermarket filter
      ENGINE: The greatest improvement to the XR200R engine is a big bore kit. Here are the 2 most common kits:
      Other options include porting and polishing the head, high compression pistons, hotter cams, etc. The more you do, the more reliability is reduced, but it is a trade off for power. Another option is an ’83 -’85 ATC200X cylinder head. It has a .5mm smaller bore, so it would need to be bored to 65.5mm, however, it has much larger cooling fins. For motors that are constantly being run in extreme temperatures, this is an option to consider.
      Overall cost: Varies by modification, expect to drop $200-$1000
      EXHAUST: There are several aftermarket exhausts on the market. These range from silencers to full systems. Prices range from $80-$500. Most aftermarket exhausts will give about the same improvement. The engine will rev quicker, which can be nice, but mostly they all just make the bike louder. For mild improvement to the stock system: grind the weld off of the inside of the header and remove the small cap held on by 2 8mm bolts at the exhaust tip.
      Overall cost: 0-$500
      SUSPENSION: This is a major weakness with '92-'02 XR200s. The first option for the forks is to give the springs more preload by adding a larger spacer on top of the springs. The second, most common option is to swap out the entire suspension. '84-'91 XR200 forks and rear shocks will bolt right up, and ‘81-’83 XR200R forks will with the corresponding triple clamps. '84-'89 CR125/250 front ends will bolt up to any XR200R with the addition of a spacer. This particular swap is more complicated, but also adds a disc brake and improves the bike tremendously when used in combination with an '84-'91 XR200 rear shock. See this thread for more info on CR front ends: These parts frequently show up on Ebay and can be obtained very cheap. Also, a visit to or similar suspension tuning company couldn't hurt with any setup. Emulators and progressive springs will get conventional forks nice and plush. Currently, XR250 rear shocks are in question as to what years will work; therefore, I do not recommend them at this point. Many people have them on their 200, however there is not a definitive answer for the years yet. Be sure to research before you buy.
      Overall cost: Generally less than $100; for Racetech tuning, expect to drop $200+.
      WHEELS: An 18" rear wheel from an '86-'89 XR250 will bolt right up. This can help because the 17" wheel spins too much sometimes, and tends to work its own spokes loose. There is also a much greater tire selection with the 18" rear wheel.
      Overall cost: Generally less than $100
      LIGHTING/DUAL SPORT: Lights can easily be added to the 200 by tying into a pink wire that just comes up under the tank, then loops right back down to the stator. This wire has no purpose, and was left behind in the wiring harness, because the non-American XR200s had lights, and Honda didn't pay to change the wiring harness or the stator. I have personally tested it up to 75 watts, but I wouldn't recommend going much higher. From there it is simply a matter of wiring it the way you want it. In any application you will need a 12v voltage regulator. I would be happy to assist with any questions on the wiring you may have, since I have redone mine several times to change things. Also, please visit this thread for some diagrams (about halfway down the page): Each wiring job is different, so it is difficult to write a generalized way to do it. For dual sporting, there are kits from Baja Designs and similar companies, or you can be creative and pull parts together yourself, and in result save lots of money. The first time I had lights on my bike, it only cost me $6. A speedometer cable can be attached to the speedometer port on the front brake hub, as long as you can find a way to mount the speedometer. TrailTech computers are the easy alternative to the manual speedometer.
      Overall cost: Dependent upon creativity. Baja Designs kit runs around $450
      Helpful XR200 Links: (engine info) (adding lights)
      **I need more links for XR200 INFORMATION, NOT PRODUCT websites....Post them in this thread if you have them***
      Again, please feel free to suggest editing....I'm sure there are MANY things I forgot. This is just a baseline to get started.
    • By Footy
      I don't have photo access yet but lets see your 200's.