Maintenance & Technical > KX250 / KX125

2004 kx 125 enduro bike 144

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umberto:
If you already have the 125, have you thought of putting a KDX 200 or 220 engine in it?  It requires a little bit of work on the swingarm and airbox, but it’s a pretty straightforward swap. I had one, and it makes a really awesome woods bike.

Another thing you might think about is adding an auto clutch to your 500. Rekluse makes one that is bolt in, or you could go with an EFM that requires a bit more fabrication work on the clutch cover (but is more durable). I have an EFM in my conversion, and it’s awesome in the tight stuff now. I think the auto clutch softens the hit a little bit, and you never have to worry about stalling.

Wire hand:
Kxdino Power on the kdx is not the issue I have been racing this thing for a long time.It has all engine mods aside from an over bore.It started and finished 14 enduros in 2018 plus the weekend riding.But there are beginning to be parts that are not as easy to find as they used to be so I am going to give the Kdx a little easier life.When I do it will be something lighter.I have ridden a kx with the 144 kit and I liked it.I just never hear anything about reliability as far as beating the snot out of them racing off road.

Wire hand:
Well,I do not know how I turned the picture that way but I failed at trying to fix it.
Foxx you look like you could pick the 500 up and walk off with it.Not me,I am a scronny little f****r!

Foxx4Beaver:

--- Quote from: Wire hand on January 29, 2019, 12:01:32 PM ---Foxx you look like you could pick the 500 up and walk off with it.Not me,I am a scronny little f****r!

--- End quote ---

Lol that was a good one!!

Well the guys gave you several good options...whichever you chose I'm sure you'll be happy!...
Sweet lookin bikes you got too!

KXDINO:
Reliability is like any machine , how you do preventive maintenance , my son raced my kx125 08 for many seasons with only a  power valve breaking but did not cause damage as they are designed not to drop in cylinder , around the 200 hr mark . we would change ring every 9 hrs  and piston and ring 18 hrs etc , do the big end and mains every year and recoat cylinder after about 4 piston changes as they wear at the bridge port , enlarging the 2 holes on exhaust side by 1mm helps this , the parts for the 125 are cheap , off course you could go longer interviews but he is a pro graded rider , the only difference on the 144 is larger piston and power valve machined as the tranny and clutch last for ever, in the reliability stakes kaws are pretty reliable , but the most reliable I had is the kx450 hands down as a bike in whole and I got all the 2 strokes and 4 stroke sizes, of course some guys wont agree but that my findings since our first mx bike kx125 a5.i have records on every bike I owned on all the parts that get replaced , it scary on how much you can spend on these machines no wonder I cant afford to drink.

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