piston ring & piston question?

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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?
 
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.
 
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
 
You should check the ring gap in the bore before installing rings to piston.
Maybe a dodgy set of rings?
 
There are other sized motors, I had an engine with 45mm bore.
Did the new piston go into the barrel without rings?
 
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
 
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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
 
^^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.
 
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