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Post by mothersuperior on Oct 3, 2010 12:50:34 GMT -5
Hello, Newbie here  I'm installing a GY6 72cc kit. The problem I'm having is the markings on the compression rings. I can't tell which goes on top. The marking on the top of the piston is "IN" or it might be "1N" The compression ring markings are: R and RN The kit didn't come with an instruction sheet, so I don't know which ring goes on top. Does anyone have any idea? Thanks much, Nancy |
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Post by 90GTVert on Oct 3, 2010 15:31:14 GMT -5
:welcome:
I believe it should be R on top. Markings will face up. If the rings are different colors, usually the silver or lighter colored ring will go on top.
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Post by Fox on Oct 3, 2010 17:50:33 GMT -5
The "IN" on the piston is short for "Intake" which means that the "IN" stamp is supposed to be at the top when you install the piston. The intake valve is the top one and the exhaust valve is at the bottom. That is crucial because if you install the piston upside down you will most likely bend the valve(s)
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Post by mothersuperior on Oct 4, 2010 3:25:55 GMT -5
Thank you!!! Much appreciated.
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Post by 2strokd on Oct 4, 2010 8:54:53 GMT -5
:welcome: Hello mothersuperior! Always nice to have another member  |
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Post by speedy1125 on Mar 5, 2011 23:54:47 GMT -5
should the rings be indexed a certain way or just any way as long as the gaps are not all aligned?
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Post by 90GTVert on Mar 6, 2011 0:01:17 GMT -5
Just as long as they aren't aligned by a good bit.
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Post by rocketdog on Mar 6, 2011 11:53:38 GMT -5
should the rings be indexed a certain way or just any way as long as the gaps are not all aligned? I've seen huge debates over this. Books say 120 degrees apart. I go with 180 degrees apart. And since the little GY6 is a horizontal engine, ok almost a horizontal engine, I don't leave the gap on the exhaust <bottom> side. That side probably has the highest thrust load. From the pistons I've seen it looks that way. Gravity and centrifugal force might pool more of the oil on that side of the cylinder. I might just be paranoid but it works for me. RD |
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Post by lshigham on Mar 6, 2011 11:57:12 GMT -5
I've read somewhere that the rings won't stay where you put them anyway, after all, they have no reason to.
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Post by 90GTVert on Mar 6, 2011 12:15:15 GMT -5
Thats why I don't bother to worry about exactly how they are placed, as long as they aren't anywhere near lining up. They're gonna move some regardless because of all sorts of reasons like crosshatching and different forces acting on them and such. Eventually they will settle into a position though. Just good not to have them anywhere near each other and likely they wont' move and settle into alignment.
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