Hi Bruce,
I use Stihl or Castrol Super 2-stroke at 25:1 ratio (40ml to a litre of 91 unleaded)
Air filter is clean and installed correctly.
I bought it second hand, have no idea of age but quite a few years old for sure. Removed head, the honing pattern inside cylinder is definitely not factory, looks like it's been done-up at some stage. Compression is good though. No way you could pull start it with the decompression valve removed and plugged.
I use it daily as a back-up mower for my mowing round.
I'm guessing rings. Plugs seem to have some carbon on it. What about air fuel ratio? Although filter is clean, it does smell rich.
Cheers
