KDX-CR125 Hybrid

**Buddha#81:Me** · 9th January 2009, 08:04

Two different mates had the two major components in their sheds doing stuff all. I haven't had a dirtbike for ten years or so. Recently I brought a XR600RE cheap but the more it stared at me in the shed the more I knew it was planning to kill me. So the 600's gone and this is in its place.

1988 CR125 rolling chassis and a 1987-88 KDX200C2 engine.

started by stripping the CR down and have slotted the KDX in. next will be to cut all the cr engine mounts and weld new ones.

This is going to take a while and will be a work in progress, more as funds become avaliable. Its going to need tyres, chains and sprockets, fork seals, wheel bearings. But for now I'm working on getting the engine mounted in the frame.

Any good ideas on what chains and sprockets, tryes etc to run where to get them from. I don't want to blow the budget but I do want reasonable quality. The bike hopefully will come up "tidy" with a full ground uprebuild (bearings seals etc) the motor is in good nick, but I'll probally throw a piston and ring at it.

**cheese** · 9th January 2009, 08:34

Should be an interesting bike.

I'd just run what ever is standard sprokets for a KDX and that should be enough for you. Is it going to have a 19inch rear wheel? just go for a MH3 if it is. Best tyre for your money.

**theblacksmith** · 9th January 2009, 09:05

It will be a fast Honda.lol.

**cheese** · 9th January 2009, 09:33

Oh and you can bore those Air cooled KDX's out to a 250 quite easily. My brother had one back in teh day and it was fucking quick.

**B0000M** · 9th January 2009, 12:23

upload a picture of yourself in your red and white striped apron!

**scott411** · 9th January 2009, 12:44

interesting Conversion, KDX's run 13-47 gearing std but i think they run better with 13-49,
88 CR125 would still have a 18" rear wheel i believe, will not make much difference if they do not,

are you building the exspansion chamber yourself? that will be th e toughest job,

i have seen a few KDX200 motors in KX125 chassis's, but never one in a CR Chassis,

**Ktmboy** · 9th January 2009, 19:45

I had a KDX200/KX125 conversion once and what a beast. Should be interesting having this motor in a CR frame as Scott said.

Green mixed with Red usually makes Orange...correct.

**krad_nz** · 9th January 2009, 21:14

Damn, I would love to do that conversion.
Where does one get a kx125 front end from these days?

Or do you just put the engine into a kx125?

**cheese** · 9th January 2009, 21:52

From what I've heard you can do either. Check out Ebay for forks and shit. you need the tripple clamps and brakes too I think???

**barty5** · 9th January 2009, 23:17

lateral thinking out side the box anything can happen i put together an 83 tt600 with as set of uSD forks from a KX250 bout years back had the have the steering head center machined down to suit the frame but bike handled real well.

**tommorth** · 10th January 2009, 07:59

there are a few ally framed cr/kdx conversions floating around on the us forums and step by steps to the kx/kdx hybrid I think the kdx motor will bolt straight into a 90 or 91 kx125 theres an article in a old adb about one

should be a cool bike once its finised dont hold back on the updates

**kezzafish** · 12th January 2009, 21:08

Originally Posted by B0000M

upload a picture of yourself in your red and white striped apron!

ha haaaaa, awesome. "the southern slasher"
What a job, onya for giving it a hoon

I believe red and green would make browny orange (a shit KTM)

**F5 Dave** · 13th January 2009, 15:26

yeah before you go too crazy I'd scope out the airbox & pipe. Without a robust setup of both it won't last in the dirt.

240 big bores apparently vibrated to a bitch.

Check the carb, a mate's old round slide KDX carb had ovalised the emulsion tube slightly (wear from needle) & ran dreadfully until it was replaced.

JT sprockets are a fair & economical brand any shop should get. o-ring chain at a minimum. DID or decent Japanese brand chain, forget anything remotely Italian.