We have a 2008 15hp 2 stroke manual which came with the boat when we bought it. All was fine until I was diagnosed with breast cancer last summer and I no longer have enough strength to pull . Buying a new engine isn't currently an option and this motor runs beautifully. We believe that the parts for a 15 and 9.9 HP 2 strokes are interchangeable. Yamaha quit making electric start 2strokes in 1998. We found a 1997 flywheel and bracket but can we assume a 1997 or earlier flywheel with ring gear and starter fit our 2008 model? I'd really love to use our boat this coming summer .