I run a happy troller on my 70hp johnson and i can get down to around .4mph. I troll for trout average rpm to keep me at my .9mph is about 900 rpm and I run like that for 8 hours at a time when done kick up plane no bogging no hesitation. The wont work good on a 2 stroke is wrong. If the motor is in good repair and tuned properly gas and oil mixed right it is not a issue.