I have a large gas engine. Looks like a Zenoah or Quadra, but much larger than a G62. Looks to be twice as big. The only markings I can find on it are, " SEM Sweden" which is on the points cover, and 121/1C cast in the bottom of the cylinder. Can anyone help me identify this?

Thanks
Doug

Probably a Volvo; I can't tell what year.

Does anyone know what CC this would be?

Doug

If it looks like it is about twice as big as a G62 than I would think it would be something like a old QUADRA 95 single or something,,,

Sachs 5.2 ...the sem is the manufacturer of the ignition....

RCIGN, do you know what size prop this engine takes? Thansk for the help.

Doug

24-8 or 24-10 should be good...
Just got a 5.8 Sachs to work on, yours is a 5.8, my earlier ID was wrong...They run pretty much the same...