Maintenance & Technical > KX500 Original

yes another kx250 with kx500 engine idea

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kayx250:

--- Quote from: don46 on March 07, 2008, 09:31:30 AM ---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.

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Thanks don...thats the stuff I was looking for that wasnt in the other post id searched.  About the carb...so the stock 03 carb will work, as in get me by by starting and idling or in stock trim it will ride fine?? and about the pipe do I need to source a donor kx500 pipe to chop the end off or will the end off my 250 pipe fit in the 500 head???

don46:
The carb will work fine, you may lose some top end, but it's not going to be to noticeable. The 250 carb is actually a little better throttle response wise than the K5 carb. You may have to taper the lower left corner of the rubber boot to fit the carb, actually you could use your 250 reed cage and boot, 03 should still be the same, I think it was 05 they changed the 250 bolt pattern. As far as the pipe, you could use the flange but it needs to be bored, as I recall the OD is OK but the ID is to small, or as you said get a donor 500 pipe. I think I used a 250 flange, chucked it up in the lathe and bored to the right ID. good luck

BDI:

--- Quote from: kaw rider on March 07, 2008, 12:25:42 PM ---i think bdi had a nice head stay.

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My head stay is for a front head stay 250.You will probably have to cut the head stay mount off of the frame and shorten it up and weld it back.

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