In last trip to the field, my da85 lost power. High RPM at 6000 with 27X10 CF prop. It used to reach 6400. The engine ran lean 3 minutes into the air.

Checked the in-line filter and the mesh screen in the carb: clean. There is no sign of leak around the carb gasket area.

Fuel is mixed with 35:1 Pennzoil Air Cooled.

This is second time it does this.

Please provide some clue on this as I start to loose confidence.

Plan to use the engine in a AW 75 Edge for an IMAC event.