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.??. .
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.
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.