Hi Dave,

I have a 3 gallon old YS 110 that has beeen running great on APC 16x6, Powermaster 20/20 inverted mount in an MK Akromaster. had one instance of starting difficulty due to a bad plug. It amounted to several attempts with a starter motor ovr a 15 minute period wwith fuel dripping out the muffler before I changed the glow plug and it started thereafter and put in a flight.

The fuselage in stored vertically with the engine pointing up. When I took down the fuse to prep it for a subsequent outing, about 1/4 to 1/2 floz of oil dripped out from the engine compartment. Flights during that outing revealed that the enginee was leaning out on the verticles. Straight and level and throttle control was fine. On landing, with engine shut down but before releasing pressure, a steady drip of oil was coming from engine cowling.

I think my attempt to start the engine with the bad plug has caused somee damage to a seal or o-ring somewhere.

How do I locate the leak, or aalternatively, where do you think the leak is most likely?

Thanks & Regards