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Hi, it looks like you took the entire flywheel off when you changed the belt correct? Thats the issue, that should not come off, you need to remove the main axle again and tighten that large nut down first then put it all back together. The last thing you put on is the drive belt. Put it on the small pulley first then work it over the larger flywheel. Just like when you bicycle chain would fall off as a kid and you would have to pedal it back on the sprocket.