I just had my first broken engine today. Just flying along and my new SK .91 broke a rod, maybe a crank? I haven't opened it up to look yet.
I just had my first oil problem today too, must have been my day for firsts. After I landed my plane I went over to the other pattern plane I took out but I couldn't get it to run?? A YS 1.20FZ. No fuel getting to the carb at all but plenty of pressure? It would run on a prime but as soon as that burnt off it would just quit?
When I got home I pulled the engine and opened up the regulator and diaphragm, all was well. I used my pressure bulb full of fuel and hooked it up to the carb line, couldn't get fuel to flow? Pulled the needle valve and gave the bulb a good squeeze, nasty old oil started flowing out!! Trickling is a better word for it. As soon as the oil was pushed out the fuel started flowing like it should.
This brings up the TO ADD OR NOT TO ADD OIL QUESTION. This also brings up some other points. I have been adding two ounces of Klotz oil to my fuel. Klotz is a blended oil with 20% of the blend being Castor. The reason I have been adding oil is I didn't trust the claim of it being 18% oil, I was thinking it was only 15%, maybe I was wrong??
This was also another MY BAD thing. I usually run my engines dry after a day of flying. In this case I had broken a header on this engine three weeks ago so I put it away wet. It has been pretty cold in Vegas the last few weeks so the oil in the fuel congealed and acted as a plug in the needle valve seat, it's a very small hole. After a good cleaning of all parts the carb is carbing again.
No real point to this ramble but I did want to point out there can be problems by adding oil to your fuel. In my case nothing bad happened but I'm now thinking I should maybe believe the add about the oil content that the hobby shop put out. The add stated 18% oil but it wasn't stated on the can and the can looked just like the Wild Cat fuel that is only 15% oil.
That dumbass married to my wife did it again!!