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Old 05-04-2012, 09:49 AM   #1
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kx85 motard

some of you already know that I have been looking to put a kx85 or cr85 front end on my crf100...
have not been able to find one at any where near a reasonable price...
well, the short story is that I am buying a complete KX85 motard, will pick it up next week...
so now i am actually toying with the idea of leaving the bike as is and racing it in unlimited and motard classes at TMGP... problem is that even though the classes exist on paper, I can not remember if there was actaully anybody showing up and racing in unlimited....
guess I best stick with my original plan and just swap front ends and part out the rest of the bike...nice thing is it is already a motard and already set up with 17" rims and slicks so all i have to do is put in the new stem and bearings and go...
may not have time to make the switch before the may race but by june it should be a go... now i have to decide if i want to go ahead and put the 115 kit in it or wait for later... ride it with the new front end for awhile to get used to it and then add the extra hp or two.
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Old 05-04-2012, 10:43 AM   #2
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Put the XR motor in the KX chassis.
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Old 05-04-2012, 10:51 AM   #3
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not a bad idea...how do you make that work... I know that they do it cr85 frames.
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Old 05-04-2012, 10:57 AM   #4
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Search for a company called dmc. They do all kinds of xr100 conversions.

Or sleeve 85 motor down to 72.
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Old 05-04-2012, 11:05 AM   #5
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Its quite a bit of work. I've done a XR100 into CR80 conversion and unless you have deep pockets to drop a couple grand for someone to convert it for you, or have very good fabrication and welding skills, its not a good project for you.

What are you looking to spend for a set of forks? I have three 80's in parts in the garage and it might be worth parting one of them out.
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Old 05-04-2012, 11:09 AM   #6
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Quote:
Originally Posted by Jason_Canuck View Post
Search for a company called dmc. They do all kinds of xr100 conversions.

Or sleeve 85 motor down to 72.
thats your best options

if you sleeve it down to a 72 you will have a F5 bike.
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Old 05-04-2012, 12:01 PM   #7
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talked to Motorcycles Unlimited they also said putting the motor in the kx85 frame could be done but was not really worth the effort and expense... they suggested just using the stem and bearings and putting the front end over onto my bike...
I can either part out the rest of the bike... or keep it and maybe make something out of it next season.
so for now it is looking like i will just use the front end and have disc breaks on the crfr100... still trying to decide if I am going to do the motor kit this year or wait until next year. once i do the front end change, I can't race stock anymore, it will all be F7 so logic says go ahead and do the motor kit too.
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Old 05-04-2012, 01:45 PM   #8
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Obed,
Putting the XR motor in the KX chassis is not a big deal, it took Ray about 2 days to do it with a stick welder and some tubing. The hardest part is lining up the drive sprocket with the rear wheel and keeping it plumb. Really not a big deal, if you lived closer I would do the welding for you. Of course you would have to let me endurance with you!
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Old 05-04-2012, 01:46 PM   #9
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Oh and you can still run F7 with the front end swap. They only make you bump classes when you increase displacement.
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Old 05-04-2012, 02:55 PM   #10
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yep I knew I could run F7 with the motor in that frame, but if I kept the bike as is with the kx85 motor I could only run unlimited and the motard (open) so it would be limited to 2 sprints and no endurance... using the crf motor and kx front end I have a whole slew of races to pick from.
I think for now I am just going to swap the front end over and maybe put the 115 kit in... and ride it like that for awhile... then later if I think putting it all in the kx frame would help, then swap it over... no sense in exceeding my riding ability just to be doing it. My biggest problem right now is braking, or lack thereof.
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Old 05-04-2012, 03:49 PM   #11
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Keep the kx and buy a spair motor so you can take your time doing the motor swap and in the end have the nicer kx chassis.
Do you know if the kx front end has been shortened?
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Old 05-04-2012, 03:52 PM   #12
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to my knowledge it has not.
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Old 05-04-2012, 03:53 PM   #13
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if it does not feel right to me I can add the TK rear linkage and an aftermarket shock to raise the rear of the bike 1-1/2 to 2 inches. was considering an aftermarket rear shock anyway.
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Old 05-04-2012, 04:01 PM   #14
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It will look choppered and change the handleing of the bike.

Have you tried the kitaco brake pads/ self cleaning pads for the xr100? I think kitaco makes some grooved shoes for it.
I would get some sand paper and disk brake cleaner do work.

Sand the inside of the drum and the pads. Clean with the cleaner. You might even try to groove them yourself.
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Old 05-04-2012, 04:06 PM   #15
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have not tried groving anything, but did the sand paper and wire brush route, then cleaned with brake cleaner... helped some, but not much.
I have riden a couple of the crf100's out there that have kx85 and cr85 front ends on them and they felt pretty good... steve has yamaha front end on his, forget the exact model...I am going to get the TK racing stem and bearings made to adapt the KX85 front end to this bike and see how it feels, they also sell a linkage for the rear shock to raise it some if need be...the nice thing is if I do not like it, I can put it back like it was. put the Kx back together and either sleeve the motor down or change the motor out... lots of avenues to play with here.
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