for the 4HP is a very popular motor for the M17s. i have a 4HP suzuki on my 17 and have had no 'power' concerns. i've seen more and more folks using the yamaha 4HP with external tank. the yamaha 4HP is on my 'radar' if i ever need to 'anchor test' my suzuki. :: Dave Scobie :: M17 #375 - SWEET PEA - www.m17-375.webs.com :: Sage Marine - www.sagemarine.us --- On Sat, 3/5/11, Howard Audsley <haudsley@tranquility.net> wrote: A 4 hp might seem to be a bit much for an M15, but if I was buying new for my M17, this motor seems attractive: http://www.onlineoutboards.com/Tohatsu-4-hp-Outboards.html 4 hp with Internal tank, but comes ready with fitting for the external if you wanted one (cost extra). Anyone have experience with Tohatsu / Nissan / Mercury?