I have a 115 Yamaha EFI 4 stroke, it is so quiet if it were not for the pisser you would not know it was running, every person who has ever heard it is amazed. There is no dougt the OB is a dream compared to a BB packed in a hole. I learned to put a starter on with one hand, starting the bolt while holding it up. This is an art that only a nice boating day can bring out. And I sware it would have been faster to pull the motor if I had a fork lift, 4 bolts and you can just hang it in your face. I will stick with OBs, I too have only removed the cover to change the oil.