I have a light 16' Lund Sendero (1000 lb. hull) and I put a Yamaha F90 on it in 2005, never had any issues...It performed great with an Aluminum 21P prop, and even better with a SS 19P. I was concerned about the weight when I purchased the motor...Anyway, I would be very unhappy with a dealer that sold me a package that performed that way...Definately get in out on calm water, better yet take the dealer with you! Maybe call another dealer...