Yamaha HP

My sticker indicates power as 5.9Kw, how much horsepower is that?

[boats.net]

Not sure see what the model number is on side of transom bracket.

[will101]

A kilowatt is approximately equivalent to 1.34 horsepower. It's an SI unit which is used in most countries (except the US funnily!)
So your motor is basically an 8hp.

The model number F6MSHZ indicates it is 6HP