Maintenance & Technical > KX500 Original

Rebuilds

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martinfan30:
I've been told these cylinders cannot be bored. Is this true?

don46:
Thats right, unless they've been sleeved, and assuming your talking about a K5

martinfan30:
Yeah 500. Why is this and what are the options?

gwcrim:
A standard cylinder is 86mm and can be bored to 88 if you replate it.  Or you can put an iron sleeve in it.

Personally, I wouldn't sleeve one unless I had to.  However some people feel that the plated aluminum isn't as durable.

YMMV

don46:
Your cylinder, assuming it is stock, is aluminum with a Nikasil coating (Nikasil is ha hard surface that will not wear, or at least not very much) if you tried to bore it you would be taking the hard coating off and be down to Aluminum, and we know how long a piston would work in that environment. You can have you cylinder re-coated, there are several companies that do it, US chrome, Millenium technologies and many others, for about $250 they will redo your cylinder to like new condition. If there is serious damage they can usually fix them. The other option is to sleeve it with a cast iron sleeve, you could then bore it to oversizes, I wouldn't do that unless you were looking for a big bore, then it might be a possibility. I would caution buying a cylinder off ebay, if you did you would probably have to have it coated as well.

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