piston ring & piston question?

GoldenMotor.com

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Mar 10, 2014
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philadelphia
can a 68.5 / 80cc piston ring 47mm fit my 80/66cc B piston?. i had to order A B piston for my 2 stroke motorized bike. the piston is a 66/80cc & the rings is 68.5 /80cc 47mm. will it fit onto my piston & cylinder?
 

crassius

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Sep 30, 2012
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I've seen many slightly oversized pistons, and they all seem to take the same rings, but these are motors that have been run, so measurement can't be totally accurate. I'd give it a try tho.
 

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Mar 10, 2014
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philadelphia
oh because yesterday i brought the wrong piston to my 2 stoke engine & i took those rings out the new piston put it on my old piston & it would not go threw the cylinder body. but when i switched back to my old rings that came with my kit it fitted threw the cylinder
 

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Mar 10, 2014
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philadelphia
yup i put the piston in without rings & it went in. and the piston rings i took off from the new piston i wrongly ordered will not got in. unless i used the old rings the came with the kit
 
Last edited:

crassius

Well-Known Member
Sep 30, 2012
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USA
if you put the rings on the piston upside down, they won't fit because the cutout for the pin is only on the top side
 

maniac57

Old, Fat, and still faster than you
Oct 8, 2011
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memphis Tn
^^What crassius said. Have to installed properly. Might also be hanging up over locating pins.
Easy to check by laying them on top of each other.