Maintenance & Technical > KX500 Original

yes another kx250 with kx500 engine idea

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kayx250:
I've read thru a little bit of this forum and i kinda wished i found this before.

any ways I previously aquired a 2003 kx 250 when my best friend passed away :cry: and he always wanted to bore it out and make it a raped ape so when i got it I put all the stuff i could basically get for it....v-force, pc pipe, pc silencer, uni filter, max power 285cc bore and port, shaved head, high comp piston which according to the shop netted me 50+rwhp with just the internal work and a pipe. So it was no slouch(it would pull 5th gear wheelies with no clutch or without me pulling up just a simple twist of the wrist and up it came) and after about 8 months of beating on it(also beating everybody i knew :-o ) the transmision locked up while riding back to camp after hearing a screacthing noise. didnt feel like tearing it completly apart i took the cylinder off thiinking i could find a donor 250 engine and just swap my bored cylinder and head and piston and come to find out the engine wasnt in that great of shape(had some scarring of sand on the walls :-( )

SO..... this is my idea get a kx500 engine fab it all up work out the kinks then bore it and port it like I did the 250 "then see what it do"  As far as I know my bike(2003) has the rear head mount like the kx500 needs so thats good, I need a cr500 pipe (some fab work), what about the carborator?? Or the air boot?? how is this hooked up or do the carbarators swap out? (I.E same demensions?) If im correct the main problem is the pipe and the swingarm needing to be trimmed down  right?

any help will be apreciated. :mrgreen:

kayx250:
Nobody knows any of the questions I have??? :?

kaw rider:
do a search.you'll find what yu are looking for.

don46:
I'm not sure if the head stay will work, it may, you'll have to bend the tank up a bit to clear the plug, maybe one of the newer shortie plugs will give enough clearance. The swingarm does need to be narrowed, the rear motor mount will need to be bored to 17mm. The carb would work as a 38mm, but I'd bore it to a 40mm. not sure how the 03 airboot will line up, if it doesn't use the 99-02 air boot, it will bolt right up to your 03 cage plate,it works good. Using the CR pipe, you'll have to change the end that goes into the cylinder, cr goes over, kx goes in, pipe mounts and modded around the water fitting for clearance. don't know about the 03 but you can make the 02 hybrid in a weekend pretty easily.

kaw rider:
i think bdi had a nice head stay.

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