CRF 100 / CR 85 BUILD

pitbike502
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pitbike502
Edited Date/Time 1/27/2012 12:20pm
Anyone know what has to be done to put a crf 100 engine in a cr 85 chassis?

Im actually really interested in doing a drz 125 in an rm 85 if thats possible
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Wandell
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Wandell 9/21/2011 10:44am
9/21/2011 10:44am
Go to planetminis.com and thumpertalk.com and start looking. Several people have done various conversions of putting a playbike engine into a motocross bike chasis or installing a motocross bikes suspension on a playbike. I know that there are a couple conversions of putting CRF100 engines into CR85's. There are also several conversions where people have put the suspension of a KX85/KX100 onto a KLX125/DRZ125 (they are the same bike).
drmarkr
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drmarkr 9/21/2011 11:33am
9/21/2011 11:33am
How about this?

The Shop

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pitbike502
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pitbike502 9/21/2011 11:39am
9/21/2011 11:39am
drmarkr wrote:
How about this? [img]https://lh5.googleusercontent.com/-4b5uQKJ268U/TbJf5I3-zLI/AAAAAAAADXA/VZFOuxLFles/kx.jpg[/img]
How about this?

thats the ticket! I keep thinking how much fun it would be to have one of these
pitbike502
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pitbike502 9/21/2011 11:42am
9/21/2011 11:42am
the xr boys one is killer, id like to find out how to do that exact build
Wandell
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Wandell 9/21/2011 8:16pm
9/21/2011 8:16pm
Here's a nice CR85/XR100 conversion.



Wandell
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Wandell 9/21/2011 8:18pm
9/21/2011 8:18pm
And a really nice KLX125 with KX85 suspension. (the suzuki DRZ125 is the same bike, only yellow)



pitbike502
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pitbike502 9/21/2011 8:53pm
9/21/2011 8:53pm
Do you have any more info on the klx? Im assuming by the sounds of it the frame will accept the trees & swingarm (therefore the rear shock? Did the rear master cylinder bracket have to be welded on?
Wandell
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Wandell 9/22/2011 8:10am
9/22/2011 8:10am Edited Date/Time 9/22/2011 8:55pm
It was built by a planetminis.com forum member called settintrendz. He's done several builds like the ones you inquired about.


http://planetminis.com/community/topic/143283-klx125-kx85-hybrid/


http://planetminis.com/community/topic/161828-settintrendz-crxr-convers…
chase383
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chase383 9/22/2011 8:43am
9/22/2011 8:43am
pitbike502 wrote:
the xr boys one is killer, id like to find out how to do that exact build
I am pretty sure they offer a kit the includes templates for where and what to cut on the frame as wel as some pre-fab pieces.

Also.. want to say they sell a steel frame ready to go... but where's the fun in that!
wydopen
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wydopen 9/22/2011 8:45am
9/22/2011 8:45am
do they still do the langtown backyard moto?????
pitbike502
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pitbike502 9/22/2011 8:52am
9/22/2011 8:52am
pitbike502 wrote:
the xr boys one is killer, id like to find out how to do that exact build
chase383 wrote:
I am pretty sure they offer a kit the includes templates for where and what to cut on the frame as wel as some pre-fab pieces...
I am pretty sure they offer a kit the includes templates for where and what to cut on the frame as wel as some pre-fab pieces.

Also.. want to say they sell a steel frame ready to go... but where's the fun in that!
I saw that they did, but they want way too much for it. $1500 just for a frame, mod air box, and pipe. I should be able to pick up the whole bike for that and start cuttin' and playin'
Wandell
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Wandell 9/22/2011 10:29am
9/22/2011 10:29am
No problem. A lot of great info on planetminies and thumpertalk. It takes more work to mount a new engine in a motocross chasis as the frames have to be cut/welded but it should be pretty straightforward for a decent fabricator/welder.
Cygnus
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Cygnus 9/22/2011 11:01am
9/22/2011 11:01am
How about a 250R engine in a 85 frame?
pitbike502
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pitbike502 9/22/2011 11:26am
9/22/2011 11:26am
We were talking about that at the shop today, can imagine that power with such a short wheelbase? Waaay to gnarly

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TJ 755
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TJ 755 9/22/2011 11:31am
9/22/2011 11:31am
Putting a XR 100 engine in a cr is cake. Pipe and air box is the biggest pain. Problem is it's still a XR 100 dog. You will have to dump mass$ into the engine and still get smoked by a mod klx or crf 150. My mildly breathed on 110 can hole shot Duane Browns trickest xr 130 or what ever it is.
I went the other route on my mid size pitbike. TTR 125 with yz 85 suspension.

You could always go this route:

here is another sweet heart:
FreshTopEnd
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FreshTopEnd 9/22/2011 11:39am
9/22/2011 11:39am
The 150r pretty much made these things not worth it.
drmarkr
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drmarkr 9/22/2011 11:49am
9/22/2011 11:49am
Kitaco stroker (150cc) kit for your xr100. The best/most reliable hp you can buy. And yes, you'll open your checkbook to buy it. The internal rotor ignition is nice as well. I have a CR/XR conversion as well, and it has a Powroll 150 stroker in it. The Kitaco is legions better.

If you build a stroker, just realize you're going to want to push start it whenever possible. If you don't, you'll be regularly replacing the kickstarter shaft.

You really have to decide what you want with these bikes. They're play bikes...I like taking them to the track every now and then to embarrass people on 250/450F's....but if you want fast, just buy yourself a CRF150R and stiffen up the suspension.
Flatliner
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Flatliner 9/22/2011 11:53am
9/22/2011 11:53am
Cygnus wrote:
How about a 250R engine in a 85 frame?[img]http://www.servicehonda.com/images/stories/10_bikes/Honda/Honda_Junior_250R/gallery/DSC_0558.JR.R.side.jpg[/img] [img]http://www.servicehonda.com/images/stories/10_bikes/Honda/Honda_Junior_250R/gallery/thumbs/thumb_DSC_0510.jpg[/img]
How about a 250R engine in a 85 frame?
These are badass, I'd love to try one set up for my weight.
Wandell
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Wandell 9/22/2011 1:10pm
9/22/2011 1:10pm
Yep, trying to go fast on a slow bike is a lot of fun. Especially on a small track. I currently have a CRF150r with reworked suspension. My son and I also share a KLX110 with suspension from a Pitster Pro X4. And if you don't want to do a build, you can just buy a Pitster Pro X4 or LXR.
Wandell
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Wandell 9/22/2011 8:19pm
9/22/2011 8:19pm
Just wanted to mention that you may want to consider Kawasaki's new KLX140. It has a full cradle frame (a lot of big minis still have an open cradle frame that will stretch out when adults start jumping them), electric start and a KX85/KX100 forks/shock swap is pretty simple.



drmarkr
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drmarkr 9/22/2011 8:47pm
9/22/2011 8:47pm
Wandell wrote:
Just wanted to mention that you may want to consider Kawasaki's new KLX140. It has a full cradle frame (a lot of big minis still have...
Just wanted to mention that you may want to consider Kawasaki's new KLX140. It has a full cradle frame (a lot of big minis still have an open cradle frame that will stretch out when adults start jumping them), electric start and a KX85/KX100 forks/shock swap is pretty simple.



That looks WAY easier/cheaper than the XR/CR/KX route......very nice!
ocscottie
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ocscottie 9/22/2011 8:53pm
9/22/2011 8:53pm
Hey Mark, go take a look in non-moto if you have a minute.
Premixed
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Premixed 9/23/2011 3:31am
9/23/2011 3:31am
that service honda 250r swap is precisely how middle aged men put themselves out of work.

"here gimme that little thing son, let me show you how its done...."
Hallzilla
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Hallzilla 9/23/2011 7:24am
9/23/2011 7:24am
LANGTOWN !

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