Honda 4 stroke outboard
Received back from shop yesterday.
Compression is fine.
Valves were adjusted but were not far off to begin with & not source of problem.
Carb was cleaned and all tiny jets, etc.. blown out.
Fouling of lower plug appears to be wearing of rings over time (20+ years). It has been suggested that I use a plug that burns a little bit hooter in lower cylinder.
Thnking I should be on lookout for new motor over next year or so...
Where is thermostat located? Would like to check that.