I will second the Suzuki 6hp four stroke. I used a Honda 8hp with a Johnson 48 two stroke main for several years. When the Johnson died, I put a Honda 50 on and used it a year with the 8hp kicker. I loved the Honda 8 but the weight on the back of the boat with the fuel tanks, battery, etc. worried me when myself and fishing partner were standing in the back fishing. Also, I didn't really need 8 hp for a kicker because it would only push me about 5 mph max at about 1/3 throttle and giving it more throttle only made more noise with no increase in speed. I shopped around and looked at the Tohatsu, Yamaha, Mercury, Suzuki, and Honda 5/6 hp motors and I felt the Suzuki 6 was the best option for me. I was concerned about the vibration since it is only a single cylinder, but I used it last year trolling for salmon and it was not bad at all, so I am happy with my decision to buy it. I believe the difference in weight was about 40 pounds between the Suzuki and Honda.
Al