Maintenance & Technical > KX500 Original

Steel-Sleeved Bore

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Polar-Bus:
The generall rule of thumb is that cast OEM pistons residing in a nikasil cyl are fitted with a tighter piston to wall clearence. Cast pistons expand less than forged. Cast pistons require slighty less warmup regiment. Forged psitons are "supposidly" stonger and better suited to high performace applications, BUT forged pistons expand differently than cast, therefore require a greater piston to cyl clearence spec. Re-borable iron liners are nice if you think you will be blowing top ends on a re-occuring basis, all's you do is sieze, re-bore, slap in an oversize psiton, and you are good to go...  8-)

I ran a LA Sleeve/ Wiseco kit on my '84 KX125, and had NOTHING but problems, but that was also 26 years ago, and also at the mercy of the quality of the machinist that did the sleeve job back then. I have stuck with OEM cast and OEM plated cylinders for the past 25 years and never lost a top end thus far...

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