RE: When does a four stroke need a new ring.
Hi
Midrange and top end are 100% perfect. Idles 100% perfect if the engine is warmed up after a flight. Just no idle when cold. I was also thinking it could be fuel. I am using Morgans Cool Power 15% Maybe I should try a different type of fuel. Maybe a castor/synth blend of some sort. I can see and smell, that the previous owner used fuel containing castor oil.