MM vs SAE
Neither. For a work saw you will want something closer to 2mm or 0.080. maybe a hair less if you want to push the limits. Where did you come up with the 0.035 for the sides?
If the exhaust port is perfectly lined up with the skirts you should be ok as long as it is sealed. Don't put any amount of chanfer on the sides of the port though or it will make matters worse. Intake port you cant cut as close as the exhaust due to loading on the piston skirt.
sounds to me like a misunderstanding of a couple issues.
As most of you guys work with these number often, when you see .020 you understand that to mean SAE inches. Usually MM is appended when refering to Metric as machinists in the US are mostly using SAE Inches.
also, you guys JUST KNOW what the reference is to, as you KNOW about what the number should be!
therefore for us :newbie:'s we need to be extra cautious, and ask more questions whereever there is ANY doubt.
I also agree... read read read.... the more past threads I read, the better ejumikaded I become.
the other issue I have noticed is there occasionally seems to be a misunderstanding as to how the cylinder is cast. I assumed also that it was concentric.. but now I see that it isn't even close!
I have come to the conclusion that you can't port the with of I/O by measurement easily. Best method is to draw the port outline on the piston before removal. then you can SEE how much to remove. Then only grind away enough to reach an acceptable level. Seems 2.0 millimeters of port edge to outside of piston skirt is the MAXIMUM we should be looking for, until we get more experienced and understand the relationships better!
JMHO!