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Author Topic: .25 .50 over rings  (Read 911 times)

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Offline hymodyne

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.25 .50 over rings
« on: September 12, 2006, 08:29:44 AM »
what exactly does .25 or .50 over mean in regards to piston rings?  are they that fraction larger than standard rings for standard (not oversize) pistons?

hym
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Offline Tim.

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Re: .25 .50 over rings
« Reply #1 on: September 12, 2006, 08:34:33 AM »
.25mm over standard bore, 0.5mm over etc.  Pistons are made to match in .25 etc. over sizes.  You wouldn't use .25 over rings on standard bore pistons I wouldn't think.
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Offline MotoRico

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Re: .25 .50 over rings
« Reply #2 on: September 12, 2006, 08:36:12 AM »
Also called S1 and S2 respectively by some piston makers. 

That was fun discovering when I bought some S12 cb500 pistons.
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Offline bryanj

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Re: .25 .50 over rings
« Reply #3 on: September 13, 2006, 01:33:21 AM »
From Honda you get Std, 0.25, 0.50, 0.75, 1.00 and you use the same size rings as pistons fitting with any writing/numbers upwards!
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