Piston size

Larry G · Post by **Larry G** » Sun Jun 17, 2012 12:42 am

Help! I need to buy new pistons for my cl77, motor was stuck, i did get the motor apart and media blasted the pistons, they have pits and not really knowing if they are still any good I have decided to have it bored over and install new pistons and rings, I have no way to measure the piston size so I looked in bill silvers book and it says to check the inside of the piston for the size or check the top of the rings, well, ring says .25 and all I see inside the piston is a small arrow and a 5. Nothing else, so I am not sure what size pistons to order..any ideas anyone?

mike in idaho · Post by **mike in idaho** » Sun Jun 17, 2012 9:00 am

Any numbers on the underside of the piston will be casting numbers, not necessarilly finished size info. Unless some clown has filed down a set of oversize rings to fit a standard size barrel there should be a .25 stamped on top of the piston. Hone the barrel and see see what it measures for diameter. If it is within spec for size after honing the rust out , you may get by with just a new set of pistons.

LOUD MOUSE · Post by **LOUD MOUSE** » Sun Jun 17, 2012 9:50 am

I believe you will find it is a 1st over (0.25) which should measure 60.25mm. ...........lm

Larry G wrote:Help! I need to buy new pistons for my cl77, motor was stuck, i did get the motor apart and media blasted the pistons, they have pits and not really knowing if they are still any good I have decided to have it bored over and install new pistons and rings, I have no way to measure the piston size so I looked in bill silvers book and it says to check the inside of the piston for the size or check the top of the rings, well, ring says .25 and all I see inside the piston is a small arrow and a 5. Nothing else, so I am not sure what size pistons to order..any ideas anyone?

Larry G · Post by **Larry G** » Mon Jun 18, 2012 10:32 pm

Thanks for info, do you know where can buy new pistons and rings? Or does any one sell a kit?
Thanks

voxa_33 · Post by **voxa_33** » Tue Jun 19, 2012 9:59 pm

Call this guy he may have. http://www.olypen.com/retro/

mike in idaho · Post by **mike in idaho** » Wed Jun 20, 2012 4:29 am

http://www.ohiocycle.com/

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Piston size

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