Help: XR200 engine on a CR frame

[j]

Has anyone here put an XR200 motor on a CR? Can I get some info on the swap.
ANy info is good. i.e. what year CR works best as far ease of swap goes.
What kind of exhaust works best? Does the enigine fit without
welding/cutting? blah, blah, blah...

Thanks

Jeff

[Gordon Eastman]

No first hand experience but here's an article about an XR250/CR125
conversion that also includes some photos of CRX 200's:

http://www.off-road.com/dirtbike/jhcrx.html

In article <8bth8n$da7$1...@ssauraac-i-1.production.compuserve.com>, "j"
<je...@jojo.net> wrote:

--
Gordon Eastman eas...@nortelnetworks.com
Nortel Networks (613) 763-2464

[MXOldtimer]

Go to BBR they are the 200 XR / CR pros
http://www.bbrmotorsports.com

[Jeff DePonte]

In article <8bth8n$da7$1...@ssauraac-i-1.production.compuserve.com>, "j"
<je...@jojo.net> wrote:

>Has anyone here put an XR200 motor on a CR? Can I get some info on the swap.
>ANy info is good. i.e. what year CR works best as far ease of swap goes.
>What kind of exhaust works best? Does the enigine fit without
>welding/cutting? blah, blah, blah...
>
>Thanks
>
>Jeff

Check out my BBR200:

1993 CR125R chassis (tightest turning mx bike of all time, so they say)
1996 XR200R motor

http://www.bbrmotorsports.com/Bikes/Bike%2030/Bike%2030.htm

Jeff

[Steve Hudson]

I made one myself some dozen years ago using an '85 CR125 chassis I
bought for $300 from a Kart guy. I cut out the cradle and installed the
engine similar to the '81-83 XR200R, using the engine as part of the
frame. The stock tank cleared with just a little 'adjusting' to clear
the head. Most of it went together fairly easily. The Powroll pipe and
3" Supertrapp made for an '81 200R bolted right up. The only 'iffy' part
was the carb-I ended up fabricating an extra long intake manifold to
clear the frame-worked OK, but I think it might have hurt performance
some.

It was a real sweet ride. Light, great handling and plenty fast enough
for me. Sold it for the princely sum of $1200 when I 'gave up' riding in
'92.

This time I did it the easy way-just let the folks at BBR take care of
it. Much easier, but definitely NOT cheap. If you're going to do it
yourself, one thing I would not recommend is attempting to convert an
aluminum frame model. The amount of fabrication needed on aluminum frame
is incredible. Definitely not a backyard project.

I would think any later model steel frame model would be a good
candidate. Gas tank clearance is usually a problem, but there are places
that can cut and 'weld' plastic. BBR recommends keeping the stock XR
intake 'bell' for best performance. A good place to look for a chassis
is at a place or organization dealing with Go Karts. The CR125 is a
popular 'shifter kart' engine, and those guys will sometimes buy
complete bike just for the engine (or they'll buy your engine if you buy
the bike).

Good luck,

Standup Steve
'99 BBR220 (his)
'86 TLR200 (hers)
'87 XR100 (kids)