How many knots can a 40Hp OBM go on a 20ft boat? and what are the maintanance for OBM?

Question

I just bought a Yamaha enduro 40Hp OBM. Can someone guide me on the maintenance and any website on the owner's manual?

Many Thanks!!!!!

Answer 1

Not much HP for a 20' boat unless it's very narrow & light> <Yamaha outboards>

Answer 2

depending on hull design & materials, probably 20mph for fiberglass deepV to maybe 33mph for flatbottom aluminum.  I'll let you convert to knots.

Maintenance:  annual gear oil change, water pump impleller change every 2-3 years.  Annually inspect spark plugs, fuel lines & fittings, wiring.  Boat motors are left sitting around idle for long periods then run hard in a tough environment, so occasionally stuff breaks.  If you fix it right away instead of trying to "get by with it like it is" it'll be more reliable and economical in the long run.

check http://www.marineengine.com for manuals, I highly recommend the "service manual" instead of "owners manual".