Originally Posted by
1QwkSport2.5r
Well, you were too lean for sure. No compression when hot is a bit scary, but if it comes back cold, it might be okay. Always richen the needle and re-tune each time you go out to fly on a different day. Never assume that a setting from one day will work on the next.
Tight head bolts are a good sign, it wasn't run way too hot...
I wish I knew the root cause. I was running it in a hot day, so re-tuning was necessary. I flew it twice before on the same day with no problems. But then starting the engine for the third flight, it did get lean, but at the same time I felt scratchy dirt behind the prop hub (flying it in a belly lander plane). It might have been the extra friction from the dirt causing the engine to heat up more? No telling. I just hope it can be revived because there are no replacements. I have both the B-case 45 and the C-case 40 engines. I like both, but the small 40 is so unique because of the small size. I wish we could get spares like the old days.
Devastated in Detroit
