The reason I am giving this 4 stars is because of the noise associated with these coatings. I took them off after standing for a few minutes and couldn't stand the rumble they make to the engine. They are very loose which causes them to vibrate a lot when the engine is on and spinning. I personally can't comment on what others say they have overheating issues. When I bought and used this set, the weather in New York was pretty cold. Maybe in the summer I would have the same problem, but at the beginning of the winter I didn't have this problem. One thing I can say is they sealed all the holes on the motor. Back when I was at the beach, starting from the boardwalk helped keep sand out of the engine.