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Mini thumper conversions

Joined
Nov 15, 1999
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#1
Hey guys,
First, I hope I posted this in the correct area........ Does anyone here have any experience in doing the CR-80 with an XR-100 motor conversion? I have had an XR motor laying around for a while and have the chance to buy a 99 CR-80 from a guy that bought it to pull the motor for his shifter kart. I have seen the BBR stuff, but I don't see shelling out a couple grand for a frame conversion through them. I alao noticed that BBR sells the air box boot / adaptor for those doing their own conversion, so I assume it can't be too bad or the wouldn't sell the parts individually. If anyone can give some first hand advice it would be appreciated.


Jason Fisher
99 YZ-400

Oh BTW, what grade / type tubing should be used for frame construction such as this?
 

ochster

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Mar 11, 2000
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#2
I know there was a couple places, that would sell you a frame already modified. You would simply give them yours as a core. That way the average guy didnt' have to deal with the jigging and welding. You may wan't contact So Cal XR's, or Engines Only, they do alot with these.
 
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#3
DMC. Those conversions look so good. Good luck. You could probably do it yourself without too much difficulty.
 

Slim

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Oct 9, 2000
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#4
I would love to do one of these myself, and have searched for info on how to make it happen as cost effectively as possible. The best source of info I found was So Cal XR's. They have a good article on their tech page on doing a conversion, and they also offer frame mods for less than some. Nothing quite as trick as the BBR setup, but I just can't afford that no matter how much I'd love to have one.
I'm hoping now that Yamaha releases it's YZ125F, or whatever it will be, about the time my 9 year old will be the right size for it. That way, I'll be able to get him a really cool bike, and I might get to play on it occasionally myself.
Good luck with your project.
By the way, the web site for So Cal XR's is either socalxr.com or socalxrs.com (I think)
 
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Nov 15, 1999
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#5
Ok,
After seeing all the pics at the socalxr's page dmc etc. I have figured out what needs to be modified and I think I can pull it off myself, so I'm gonna give it a shot. My next question though is...what about modiyfing a stock xr 100 frame to hold upgraded suspension ? I figure the forks could be fitted with a set of custom triple clamps, but the swing arm / shock linkage would be the hardest part. Of course I guess the geometry would probably be too far off then.....oh well, out to the shop to get started measuring and jig building. With any luck I might just see ya'll at Langtown.....


Jason

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Aug 8, 2000
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#6
The XR100R frame flexes too much for serious riding on a track. Just mod the CR frame to fit it, then you'll have a SWEET bike!

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The Original Speedster
1985 XR100R
1978 XL250S