Yamaha 40HP 4 stroke.

[felic]

Would like to know any information and past experience about this motor. All comments are welcomed.

[Destination Sea]

try these, and check whether these are relevent to your intended motor (may be outdated or model changed)
http://www.boatsales.com.au/editorial/engine-reviews/2004/johnson/part-3-four-strokes-from-40hp-8302

http://www.boatsales.com.au/editorial/engine-reviews/2000/yamaha/yamaha-f40b-8158

main site  http://www.boatsales.com.au/

[felic]

Thanks, very intresting

[felic]

I learned that this motor has the same engine block of the 50Hp , it is only detuned. Can this be uptuned to give the available 50Hp ,by simply some elctronic updates??