I just bought a beautiful kitfox 4-1200 with a 912uls 100hp it has 6 hours on it, the builder did a wonderful job, it looks like a show plane, durring the test flights the oil temp rises to over 250- 260. the builder thinks it could be the spinner /prop combo? The spinner is 8 1/2" and prop is a 3 bladed GSC. Cylinder head temp is normal The one thing I see which might contribute to the over heating problem is the spacing between round cowl and the airplane, I wonder if there might be a correct spacing for the air to exit ? does anyone have any ideas? lakeflyer