After running great for month, the engine started to have a rough idle. Otherwise it seemed OK, especially it was not running hot. Eventually, though, it quit in flight. It has never been quite right since then: Rough idle, and when using the governor, the engine RPM seemed to oscillate around the target RPM.
After trying this and that, including taking it apart, eventually even getting a new engine for comparison, reasons for the problems seem to include:
- Rust on bearings. Unclear how that happened because I'm using after-run oil. It is because of the oil?
- Play in throttle serve
New engine in comparison idles down to a low put-put that I don't remember ever achieving with the original engine. Either I've gotten better at adjusting engines, or the previous one always had some imperfection?
Yes, be careful with the piston ring. It does snap easily when taking it off the piston, especially when it's brittle from having been in the engine a long time. On the other hand, a new piston ring goes on quite easily, snapping right into place.
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