Skiman,

Are you sure. The total weight of the TSP is 19.52 oz and the weight of the .46NT is 13.10 oz. I would expect the flywheel to be most of the difference, maybe 5.0 oz to 5.5 oz. I am only asking because I do not have the old flywheel to weigh. I am thinking of putting the engine on a plane that should really have a 10.0 oz engine on it, so it would be nice to know the weight of the TSP without the weighted hub.