4 Advice to Choose a 2 Stroke Engine Piston Rings

Traditional piston ring sizing has been in fractional inch measurements. You'll typically find top and 2nd rings in 5/64-inch, 1/16-inch, or .043-inch sizes, with oil rings typically in the 3/16-inch size. Modern engines moved to metric ring measurements of 1.5mm to 1.0mm for top and second rings with 3.0 to 2.0mm oil rings. These ring thicknesses have been the norm for decades, but moving to a thinner ring package has shown several advantages. With custom pistons, you'll find types of piston rings as thin as .5mm (.020 inch). The thinner rings provide some great benefits, including increased horsepower and torque while reducing weight and compression height. Significant power gains can be had from utilizing thinner, modern rings and piston designs. While it has been more critical to use the proper piston ring installation pliers on thicker rings, we highly recommend that you use the same tool on thinner rings as well. The only types of piston rings that are OK to be 'spiraled' onto the piston are the oil ring's top and bottom rails. Never spiral the compression rings onto a piston.

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Edited Date/Time

12/18/ 2:55pm

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To me the cylinder looks perfect, minor carbon buildup on the exhaust side of the head and piston crown, no blowby on the piston, the only blemish I can find is the very light scuffing on the piston but it's very minor.

I'm doing my winter tear-down of my 144, 17 hours on the engine. I was going to take a look before I decided if I should just pop in a new ring, or do both piston and rings.. It looks good to me, what do you guys with more expertise think? I've been running Renegade SX2 and Maxima 927 @ 32:1, jetting has always been in the ballpark but not perfect. I know I'm a little bit rich on the needle/pilot but main is usually spot on. Everything seems to be getting no shortage of oil, and the only place there is any detectible carbon buildup is in the head chamber, PV is clean and free.To me the cylinder looks perfect, minor carbon buildup on the exhaust side of the head and piston crown, no blowby on the piston, the only blemish I can find is the very light scuffing on the piston but it's very minor.

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