10 Things to Consider When Buying 2 Stroke Engine Piston Rings

All through high school I was the mechanic at a brand new, large, fancy golf coarse. Old guy that was doing it died right after the coarse opened, I lived within biking distance, somehow they hired a 14 year old kid to maintain a million dollars in mowers and stuff.

Anyway, I did some horrible stuff to keep weedwhackers and backpack blowers going. The operators frequently filled them with straight gas.

From what I remember from 25 years ago, if the rings have tension, or you can bend the rings out to have some tension, and the rod bearing was good, the thing would run pretty OK. If the rod bearing was toast or the rings were stuck, no way.

So even though that piston looks pretty fucked it could run Ok if you free the rings and tweak them back out to the shape they're supposed to be and hone the cylinder.

I'd be more concerned about the rod bearing myself and that would be the reason why I would try fixing it as if I was in a 3rd world country before spending bucks on a piston. If you can start it, you can determine if the rod bearing is good. If you put a piston in it and the rod bearing is bad then you wasted alot of money.

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Edited Date/Time

12/18/2014 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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