KX100 what in the world to do?

[ianmp]

Originally Posted by sixstringsteve

Very inspiring thread. Has anyone out there ever stretched a kx100 frame?

6) this is the scary part - extend the front of the frame and change the head tube angle to be steeper. I'm thinking a 2-3" stretch will be just about right. I've done motor transplants in motorcycles before, and my last bike was a kdx200/cr125 hybrid. I'm not afraid of hacking up a bike and welding and fabricating, but I've never stretched a frame before. i'm thinking of stretching it a few inches behind the head tube, that way I can retain the KX100 tank, radiator mounts, and pipe.

Don't do that-- if you want to steepen the head angle, look into modifying the suspension linkage to pitch the front triangle forward more. You are already talking about a custom swingarm; it could be as simple as moving the forward shock mount.

-Ian

[250kicker]

I keep seeing these kx100's popping up on craigslist but i'm still on the fence (i'm 5' 7 @ 190#). Sounds like a good bike to beat up in the woods. How about some more ride reports? enjoyed the vid.

[sixstringsteve]

Originally Posted by 250kicker

I keep seeing these kx100's popping up on craigslist but i'm still on the fence (i'm 5' 7 @ 190#). Sounds like a good bike to beat up in the woods. How about some more ride reports? enjoyed the vid.

I just got one and I rode for the first time this past weekend. It's definitely not a beginner's bike, and it doesn't have much low-end torque at all. Knowing that, it's an absolute blast to ride. It's a handful for a beginner. This bike has two personalities. For those who stay out of the powerband, it's a fun little putt around bike with zero low end. But it's manageable and lighweight. For those who know how to ride in the powerband, it's PLENTY of power, and a little rocketship. It's a blast. Wheelbase is too short, but seat height, weight, and agility are all there.

I'm planning on swapping to 21/18 wheels on mine, stretching it, and putting on a bigger tank to tackle the woods here. build thread here: http://www.thumpertalk.com/topic/958..._fromsearch__1

I think an xr200 would be a better bike for a lot of people, but if you want a rocketship in the trails, I think a kx100 could be the ticket.

[Conman]

http://www.projectm85.com/prototype.html

Check what they did with a kx85 Engine.....

[sixstringsteve]

I love that project. It was what made me decide to use the KX100 as the platform for my trail bike.

[250kicker]

"The M85 is aimed at creating a new market segment in the motorcycle industry." (2008 quote) ...So can you buy these?

[sixstringsteve]

There was only one built, and the market demand wasn't enough to put them into production. They have a 30-page thread somewhere out there walking through the thought process behind marketing them. I think they're waiting for the economy to pick up before pursuing it further.

[Salsa]

Here is my version.

Double Disc 8" bicycle front brakes, Single 8" rear brake, custom welded front and rear hubs, adjustable head crown, and KX85 forks, air (no spring) shocks I built 35 years ago (under seat). 160cc 19-17 wheels, 175# plus gas.



Don

[shirk]

Originally Posted by Salsa

Here is my version.

Double Disc 8" bicycle front brakes, Single 8" rear brake, custom welded front and rear hubs, adjustable head crown, and KX85 forks, air (no spring) shocks I built 35 years ago (under seat). 160cc 19-17 wheels, 175# plus gas.



Don

That is an interesting build. Do you have more info on the build? Pictures of the rear airshock?

How much weight do you figure you saved with the bike brakes vs the lightest moto brakes? Why not hydraulic bike brakes or trials brakes?

[Salsa]

You want light !!!!!!!!!!!!!


If you can't lift your bike, It is TOO heavy !!!!!!!!!!!!

This was the first one. It was lighter. The same brakes and Bicycle Downhill forks (about 6 pounds), single side shock and 130cc engine.

If it is worth doing, it is worth overdoing. The front brake is overkill, but it looks good. The brakes are a little lighter than the lightest moto brakes, but the hubs, spokes are a lot lighter.



The rims on this one are 20" bicycle (16" motorcycle) and they are a lot lighter. I built this one first and wanted a dirt bike, thus the other one. Mechanical brakes are simpler and available for bicycles.

More pictures here:
http://s271.photobucket.com/albums/j...Honda%20CT200/

Don

[hugemoth]

Ultralight bikes are great. This is my poor man's version that I haul around on the back of my camper. It's a 68 Trail 90 frame, XR100 tank, forks, bars, front wheel, etc.. Lifan 140 engine. Well under 200 lbs, 60 mph, 100 mpg, street legal, able to leap tall buildings in a single bound. I've got a bigger dual sport but really enjoy riding this one.

[kx100rider]

I have a 2011 KX100 project i have been working on.

[sixstringsteve]

Originally Posted by kx100rider

I have a 2011 KX100 project i have been working on.

tell us more.

[kx100rider]

Fmf Core 2 muffler
53t renthal rear sprocket
420 Gold renthal chain
10oz fly wheel weight
Cycra Stealth DX Handshields
Pro Taper bars
Pro Taper grips

Next to come is:
IMS Tank
FMF Fatty Pipe

[bk brkr baker]

Originally Posted by Salsa

You want light !!!!!!!!!!!!!


If you can't lift your bike, It is TOO heavy !!!!!!!!!!!!


More pictures here:
http://s271.photobucket.com/albums/j...Honda%20CT200/

Don

Great stuff Don! Love the frame jig !
I couldn't tell where the shock was on the bycycle based mo-ped. There is a shock , right ?

You make me want a bike that I outweigh !