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I've had a few OS engines since then, the OS18 CV-R(X), OS 18TM and OS 21TM. All of those will hold a tune all day long as well. I still have both of the TM's. The 18TM probably has 10 gallons through it and it's a spare engine now. Runs like a top with good power still. The 21TM is in one of my...

The OS21RG was a well regarded engine... 15+ years ago. LOL! That's what I ran many many years ago. I had 3 or 4 vehicles, all with that engine in them. By today's standards, they were not powerful engines, but they held a tune all day long and were easy to find the tuning window of.

That blows. I had an OS 21RG split a rear crank bearing ball in half once which tore the piston all up and had an orion crank shaft snap in two while tightening the flywheel nut and another OS21RG crank snap in half where the intake journal is. Sometimes, it's just a defect regardless of the...