References in periodicals archive ?
The engine was disassembled: three piston skirts were broken, the bottom scraper ring from each broken piston was found in the oil sump.
There is a scraper ring inside the swivel lock actuator that keeps dirt and grime from entering the actuator.
The engines use oil-cooled three-ring pistons with two compression rings and an oil scraper ring. The connecting rod is forged steel.
"Their concentration on retaining an oil sump, oil scraper rings, and relying on plain bearings instead of roller bearings," he theorizes, "increased the amount of oil burned, which harmed emissions performance." And it may be another reason why automotive two-stroke emission performance degraded over time.