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Piston Question

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DavidZ1R
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Piston Question

#1 PostAuthor: DavidZ1R » Mon Oct 27, 2014 6:33 pm

I have a piston which has +2 stamped on the inside, but only an arrow on the crown, is this 1st oversize, and does the cylinders need a rebore to take them, or are they for worn cylinders? ta
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z1bman
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#2 PostAuthor: z1bman » Mon Oct 27, 2014 7:10 pm

Kawasaki pistons are normally marked on the piston crown with either std +20 1st oversize +40 2nd oversize
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#3 PostAuthor: DavidZ1R » Mon Oct 27, 2014 8:47 pm

Thanks Z1B man, I assume its first oversize, if it is does it nee to be bored out to a new size?
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#4 PostAuthor: z1bman » Mon Oct 27, 2014 8:51 pm

you really need to measure the piston that is in the bike & compare the measurement with the new piston
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#5 PostAuthor: Z1Boy » Mon Oct 27, 2014 10:37 pm

Oversize pistons are stamped on the crown. ART pistons are stamped +.5mm or +.1mm. The barrel must be re-bored to the correct size. You cant just put an oversize piston in a worn bore, most bores wear oval and tapered.
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