Maintenance & Technical > KX250 / KX125

Restore 1993 KX125

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bluestreak04:
Hello, I have not been on this site for many years now, glad to know that my login still works.

I recently picked up a 1993 KX125 from a close friend. Bike runs decent, it has brand new PC exhaust system, and a rad valve. Bike truly needs a complete restoration to be safe at speed. Spokes are loose, chain is bad, sprockets worn, brakes are terrible. I have been looking for a project like this for a while now.

What other year model 125 engines will "BOLT" into the frame? Considering this as it seems 1994+ parts are easier to come by. The last 1993 KX125 I had back around 2001 was not very reliable. I was only 15 then, so its also most likely my lack of experience that contributed to my problems. Young and dumb. I have done a Frankenstein build on a Honda CR250 before (2000 engine in 2002 frame), so I am looking for something a little "out of the box" on this bike also.

umberto:
I found this thread from a guy in a similar situation.  Read the third post from Motopunk on the motors and cooling systems.

http://www.kxriders.com/forums/index.php?topic=11581.0

bluestreak04:
Very interesting. The only reason I could see that the cooling system would need to be changed is because the 93 has two hose nipples vs a single nipple on the 1994+. I wonder if I could use a newer engine, and just run the older head?? Thank you for sharing that link.

sandblaster:
93 to 02 use the same head gasket so you might be able to bolt on the older head to the newer engine.
Reliability is good on any of those years if a thorough rebuild is done.
Being cheap will only give you problems..

bluestreak04:
I have read in a few places that the 1993 reliability is terrible, why exactly? When I did rip the bike down the field, it ripped, was faster than I expected, but it would lose spark after ripping hard. I have a complete ignition system for it sitting on a shelf until a final plan is settled on.

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