A heads up for the M-15 crowd. I have seen several posts on the Potter sites about the Honda 2 Hp motor and lost gas caps. It may be a design problem or operator error. I suspect resting a large fuel container on top of the motor would pull the cap loose, but I do not have the boat at home to look at it. Of course the cap sinks, so it is not possible to tell if the restraint was broken. It is not clear to me which vintage motors have the problem. Steve R. M-15 #119 Lexington, KY