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Piston Question
Posted: Mon Oct 27, 2014 6:33 pm
Author: DavidZ1R
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
Posted: Mon Oct 27, 2014 7:10 pm
Author: z1bman
Kawasaki pistons are normally marked on the piston crown with either std +20 1st oversize +40 2nd oversize
Posted: Mon Oct 27, 2014 8:47 pm
Author: DavidZ1R
Thanks Z1B man, I assume its first oversize, if it is does it nee to be bored out to a new size?
Posted: Mon Oct 27, 2014 8:51 pm
Author: z1bman
you really need to measure the piston that is in the bike & compare the measurement with the new piston
Posted: Mon Oct 27, 2014 10:37 pm
Author: Z1Boy
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.