1 ring or 2 ??

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Mar 14, 2001
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#1
I have just completed a top end rebuild on a 99 RMX.
The pro x piston that I got only had 1 ring, compared to the OEM that had 2.
Will this wear any faster than two rings , needing more frequent rebuilds.??. .

Any thoughts ??

Thanks .
 

mxer842

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Nov 11, 2003
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#2
one ring makes the piston weigh less and causes better performance but needs more frequent ring changes while two has the piston weigh more and perfromance isn't as good but rings last longer.
 

Layton

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#3
mxer842 said:
one ring makes the piston weigh less and causes better performance but needs more frequent ring changes while two has the piston weigh more and perfromance isn't as good but rings last longer.
That is probably somewhat true...but I doubt the average rider would notice the difference.
 

mxer842

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#4
i thought the same thing to, but when i did that i noticed that the bike wasn't more powerful but it revved freeer, not a whole lot but enough to where i noticed it... it makes since because those rings way only a few ounces but those ounces have to be spun around at 13000rpm so it would make a difference.
 
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#5
another reason for manufactures going to the one ring set up is that there is less drag against the cylinder with only one ring. So it does allow the engine to rev easier. My bike came stock with a single ring piston.