Maintenance & Technical > KX250 / KX125

KX 250 Mismatched Crankcases

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Kawafornication:
Has anybody ever made two different year crankcases match up with a helping hand from a Dremel? I have a KX 250 1991 right side and 1990 left side and am thinking to cut out the bit that does not match up??  :?

sandblaster:
I believe the older cylinder does not use floor ports.
If you are using the older cylinder you shouldn't have to worry about it.
If you are using the newer cylinder you should make the cases match as long as there is plenty of material.
It looks like there is.

Kawafornication:
Great I will take some pictures when I get the engine taken to bits, these cases are meant to be going on the donor bike for resale, not sure which cylinder is going on them yet unless I am better off leaving the 90 cylinder with the 90 crankcases due to floor ports (what ever they are) I thought that the case with more metal was the 91 side?

PS, it says

"An Error Has Occurred!
The upload folder is full. Please try a smaller file and/or contact an administrator."

so cant add a picture

sandblaster:
Floor port?
Take a look here

http://www.oem-cycle.com/forum/viewtopic.php?f=110&t=1480&p=7789#p7789

Kawafornication:
Thanks for taking the time to do that, does that mean you can use the 1991 cylinder on the mismatched 90/91 cases (not going to lose performance as never had extra floor ports) if so with or without the metal from the 91 case ground away? or better to remove the extra metal for flow reasons :?

Knowledge is power, i'm still learning  :-D

PS, I assume that also means if you used a 1991 cylinder on 1990 crankcases you would be losing performance as originally meant to have the extra floor ports??

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