Hello all
I am after some thoughts on this engine, that I have never touched before.
After pulling it apart to clean it, I am noticing a quality built engine.
[Linked Image]

Here are some markings.
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

The main things I am unsure of:
1. is the small flywheel
2. oil fill plug on the back of the engine (is this for a gearing?)
3. 106cm cubed (I would expect to see a larger sized engine on a 21 inch base)

The sticker mentions reduction gear & direct drive, which I am also unsure about.

[Linked Image]
[Linked Image]

There rings are loose in their grooves compared to other 2 strokes.
[Linked Image]

Head gasket looks to aluminium.
Exhaust has a removable plate for cleaning out carbon.
Exhaust gasket is a non ferrous metal looks like brass.
[Linked Image]
[Linked Image]

The piston and bore is not damaged and is making the right sucking noises when turning it over.
I haven't split the case.
Will clean the carb tomorrow and put it together for a test run.
Cheers from Mark

Happy is he who penetrates the mystery of things.