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I have a F90 on my 1984 Montauk and it has been great. I have tried kicker motors on it: F6, F9.9, and F15. If you are going with an engine this heavy, I would first suggest making sure that you have moved your battery(s) to the console for better weight distribution. I think that for 2005, the motor weighed in at 369 pounds. It's a little heavy but it works great. When you start adding a kicker, things get a little dicey. The F15 was much to heavy at 120 pounds - the boat listed to starboard and would have water splash over the transom pretty easily. The F6 is the best option: it can get you about 5.5 mph and it only weighs 60lbs. But in the end, I decided not use the kicker on the boat at all. I bought the reliable F90 and run with it. There really isn't much to be gained by having the kicker there. It's not going to save you much money in fuel costs and the F90 is amazingly fuel efficient and reliable. Just maintain the F90 and it should treat you well. Actually the new F115 weighs in at 377 now - I might get that instead.