Didn't get much feedback in the engine forum...so I thought I'd try here.

I have a new OS 46FX that was broken in with three good runs at a rich 2-cycle, alternating throttle settings on the second run, and peeked on the third. I peaked it at around 12000 with an 11x6 prop. I'm using 10% coolpower, 16% syth, 2% Castor mixed in.

On it's fourth or fifth flight, the Dubro quick fill valve leaked and caused the engine to go very lean in flight. Coughed and wheezed a few times and it sounded like it wanted to quit. I landed within 1-2 minutes when it didn't improve.

I put the quick fill valve on a third line to the tank with a clunk and plugged the output. I was only able to get 10,800 on the 11x6 prop and in two flights tonight, I had one dead stick at low throttle and the other time it quit on the ground after landing.

While cleaning up, I noticed that the exhaust residue was brown, not clear like I'm accustomed to seeing. Was that just the Castor oil or a bad sign?

Does it sound like that lean run messed this engine up?


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