I have had a Honda 9.9 for around 10 years, maybe more. I got mine the last year they had the square housing. Other than change the oil in the motor and leg and I think the spark plug once, no maintenance whatsoever. ( Knock on wood) Occasionally I will have to poke around in the pisser tube after it sits for a bit to get the salt out, even after a flush but that is it. I first had it on an 18.5 and now a 27 ft.. It is awesome for trolling and pushes me along at about 7 mph in calm water when needed. My buddy has a Yamaha and he loves that too.