Right Prophanger! Hard chrome bore and ringed piston, they take a LOT of running in. Like Prophanger says get a few gallons through it first. You might also check out your cooling arrangements (exit 3 times inlet) if it's cowled, overheating is a favourite for causing cutting especially when prop hanging. Good luck, hope you get it sorted.

EDIT: 3D-kid330, what does your H9 Edge weigh? I'm torn between the DP Edge and the H9 Edge for my Moki 1.80. The H9 is a good deal cheaper too but I don't want to compromise 3D ability and will pay extra (?!) if the DP is better. Any views? Anybody?