Having had a few problems with partial seizures with the free air 503, I got a fan cooled 503 from Danny. I finally got these figured out when I repitched the prop, as the CHT was high, but the EGT was low (meaning the engine was working too hard). I could then get it to ~6400rpm on climb out, where before it had topped out at ~6000rpm (the red line's at 6800rpm). The trouble is that the fan cooling robs a few hp from the engine.
As it's been getting hotter, I was finding the density altitude (of ~3,000' on a really hot day) a problem for climbing out, especially 2-up. I finally broke down and found a good deal on a 582, and got that installed and all set up. In the middle of summer, I could now hit about 1,000'/minute on climbout, and had no appreciable increase in fuel consumption (as I'm climbing for less time). It fixed the only thing I wasn't happy about with the thing.
After passing my gyroplane test, I managed to get a Magni M-16, so this went to Marysville.