Maintenance & Technical > KX500 Original

CR500 rod and Piston in KX500

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hillclimber147:
Has anyone tried the CR500 rod and piston in their KX500? If so what year rod would be better, the 139mm 86 rod, or 87 and newer 144mm rod? I'm looking to build a big bore KX, starting with a 90mm piston. That should give me 547cc's.

doordie:
You can stroke it to 88mm and bore it out to 88mm and use the 2mm oversized Wisecopiston.
You have to make a spacer underneath barrell too.You can adjust porttiming with it at the same time! :wink:

Many have done this mods and it working very well. :evil:

hillclimber147:
With a CR500 rod I can bore it all the way to 91mm. Then if that's still not enough I'll look into stroking it. Both have the same big end pin diameter, and once I get the port timing difference between the two figured out it should be fairly simple, maybe. Thought I'd see if anyone else has done this.

kx666:
if you could find a way to stroke itm, i would love to hear it. i thoguhgh the kx and cr had the same bore and stroke.
 :?

hillclimber147:
KX 500 - Bore 86mm, Stroke 86mm

CR 500 - Bore 89mm, Stroke 79mm

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