hi all,
Im trying to compare a couple of yamaha 4 strokes, both long shaft, both
electric start. the 15 and the 9.9 seem to share a common block, but with a
different carb and prop? they have exactly the same weight (50kg), same
displacement (323cm3), same compression (9.19:1), different gear ration
(2.92 for the 9.9, 2.08 for the 15).

is the 15 just a 9.9 with a different carb? are they just as reliable as the
9.9? Im guessing they wouldnt have as much usable thrust as the 9.9 with
its bigger prop, but probably a higher top speed?

thanks for any and all info,

Shaun