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Oversize Pistons 0.50mm

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Trigger:

--- Quote from: stevush on October 14, 2015, 08:36:50 AM ---So what size would these standard rings be ?

Good question... I'd assume that they're to fit a standard 51mm piston.
I need 51.5 mm pistons and rings, however I do have another option..

I could ask SEP to make and fit new liners, then rebore to std size, then re-use my std Honda pistons with new rings.
Swings and roundabouts really, save on new pistons but pay for new liners ?

Steve

--- End quote ---

To have a new set of liners made is not cheap.

stevush:
I'm ressurecting this thread because I've acquired a set of oversize pistons, or at least I'm led to believe that they're oversize. I have no vernier gauges or the like to measure them but the guy recons they are 51.5mm when he measured them. They are genuine Honda but looking on the crown, I can see no oversize markings anywhere to show the size, are they ALWAYS marked with an oversize ?
My bores are STD at the moment but need a .50mm rebore and these pistons slip into the bores now. Surely they should be too large to fit ?
Maybe a stupid question but I'd appreciate some help

Thanks
Steve

Gixxer-18:
If there are no marks on the piston crown; The oversizes are sometimes cast into the piston in the pocket either side of the gudgeon pin holes.. (wrist pins)
HTH
Nigel.

stevush:
I see nothing at all on the crown, either side of the pin theres just casting numbers 'S377' and '3'. On the opposite side just 'HONDA'
Thanks
Steve

Johnwebley:

--- Quote from: stevush on February 09, 2016, 03:39:20 PM ---I'm ressurecting this thread because I've acquired a set of oversize pistons, or at least I'm led to believe that they're oversize. I have no vernier gauges or the like to measure them but the guy recons they are 51.5mm when he measured them. They are genuine Honda but looking on the crown, I can see no oversize markings anywhere to show the size, are they ALWAYS marked with an oversize ?
My bores are STD at the moment but need a .50mm rebore and these pistons slip into the bores now. Surely they should be too large to fit ?
Maybe a stupid question but I'd appreciate some help

Thanks
Steve

--- End quote ---



  the tolerance on pistons is very close,
those pistons are standard,no other piston would get anywere near ,

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