Does anyone else notice what their pistons look like on the intake side.?With the oem plating i was getting scratches on the piston, the cylinder had corresponding line's ,But the cylinder was smooth If you are looking at the piston in your hand,from the intake side, the scratches were showing up on the left side, and right side ,the left side is more prominate,where it rides on the intake part of the bridge on the cylinder.I gap my rings also,If you look at the ring locating pin it is in line with that,But it is not just 1 scratch,The scratches are the same width of the intake bridge about 1/4 inch wide, starting below the bottom ring and they run to the bottom of the cutaway on the piston..I had my cylinder replated a while ago I did a top end on it and i had the same scratches on the piston,but they were a little heavier,and the same lines on the cylinder as before,but they were light brown ,I am thinking maybe because the plating is stronger than KAWA'S PLATING and the way the piston intake rides on the 2 narrow bridges(LEFT AND RIGHT SIDE OF THE INTAKE) Looking at the cylinder through the exhaust port,look to the right where the locating pin rides on the bridge that is where i am talking about. The left intake bridge looking at it through The exhaust port,You can see the lines on the cylinder,but not as bad.The lines have a light brown color to it only on the right side.. The piston left intake side will line up with it Just like before .The only difference is i have that light brown color to the lines on the intake bridge.Well what does any one think,do you think kx's huge intake in the center and the narrow 2 bridges on the side where both the ring gaps would ride have anything to do with it.Trust me it is not dirt I went through this before,My jetting is nearly perfect The first piston i took out after the replate had a beautiful burn pattern, The exhaust side of the piston and the sides of the piston look perfect.I have 5 hrs on this piston, I figured let's take a look at the cylinder again through the exhaust port and drive myself crazy, the cylinder looks the same.Every thing else in the motor is within spec.My bike runs sweet,Compression reads 225LBS.Maintainence do i need to tell how I am.? What do you guy's think, maybe the way kawa has the huge intake port,and the 2 narrow bridges on the side where the ring locating pin would ride seems to be the cause.I am going to run it anyway,I am kind of going out of my mind trying to figure this out. I don't think you can get away from it because the design of the intake side of the cylinder.
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