Thinking of buying 2010 Yamaha F6 4 stroke portable. This is newer version with smaller gearcase and built in fuel tank. I'm very concerned about how much vibration there may be with the single cylinder. I really want a new 2 stroke 2 cyl 6 hp with integral tank but I don't think it exists. Bought a Tohatsu single cyl 4 stroke (I think 2.5 hp) for another boat and the amount of vibration was simply unacceptable. Would appreciate any thought on vibration of the Yam 6, how much I should expect, etc. Thanks