Maintenance & Technical > KX500 Original

Boring the kx500

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Tim short:
I was just curious about other member that have bored their kx500

How much and did you have to do any mods to the head ?

I am forced to over bore because of slight cylinder damage i was thinking a .20 or .40 over ? thought?

thanks

Foxx4Beaver:
I believe once you get to 88mm on the bore, you need to modify the head, but don't hold me on that. I'm at 88.5mm(535cc), and I believe I was told once you get to 88mm it needs to be done....but I also needed to have my center exhaust valve modified to accept the larger bore, as will at 88mm, otherwise catastrophe would result.
If you're really serious about going that much bigger...I strongly suggest Todd Pinnsonault...he did mine, and he's done several other members as well.

you can contact him here....
http://www.kxriders.com/forums/index.php?action=profile;u=1767
http://www.kxriders.com/forums/index.php/topic,10028.0.html    

Foxx4Beaver:
another thing to consider if it's in your budget....is having the crank balanced/trued...this really makes a huge difference when you start going bigger on the bore size, because these things will vibrate themselves to death, and put your arms to sleep otherwise!...and Pinnsonault can and will do that too....worth every cent if you can afford it!!

Motorrad:
91mm bore on my bike.

sugilite:
I "sleeved" mine out to about 530cc and really regretted it. It never made as much power as the standard one and noticibly loses power as it gets hot. I'm putting mine back to standard as a result - worth the extra expense of getting a cylinder re-plated in my opinion. :-)

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