I had a 50Hp 4 stroke Yamaha on my 18 g3.... It was great. Quiet, great mileage, easy starting. I liked it so much, I put 2 of them on my new 20 ft hewescraft searunner, 100Hp and 8Hp four strokes. Great warranty too. The most common problem you'll have is screwing up the starter turning the key when its already running...its that quiet!