Mercury sea pro 15hp 2 stroke

[monkey]

Just bought a very nice 2008 example of this motor. But don't know that much about it . From what I can gather they are commercial grade uprated engines with more stainless parts and stronger gearing system and a carb with a different idle jet so they don't mind running on crap fuel or at idle for long periods. Can anyone tell me anything else about these engines?
Does anyone know if a engine cowling off an older mariner would fit ? Looks very similar. Cheers

[Max...]

Marathon/Sea Pro - same weight I think but upgraded internally as you say, model the RNLI stick on the Y Class. Useful manuals here:

Index of /lib/mercury/manuals

[monkey]

That's very helpful Thanks. Looking forward to see how it compares with my tohatsu 9.8. Which I don't know if I can bear getting rid of ! Its such a nice thing.

[Max...]

Doing exactly the same myself! The 15 is a real useful increase in take-off. The Mariner 15 is the lightest 15 out there too but the extra 8kg does make a difference in lumping it about.

[monkey]

Ok that's interesting , I wonder what the fuel economy difference is for a similar journey in a similar time ? I think I will keep both the 9.8 and 15 as they will certainly not lose money and could possibly gain some value. Then I can use the 9.8 when its just me and the 15 for trips with more people. Although in North wales the slip fees are about £20 a year for under 10hp and about £20 a launch for over so will have to see. Apparantely the mercurys all have a special curved section high up the leg to assist in comfortable shouldering of the motor !

[Max...]

For a small 2 stroke generally work on 10% of HP = gallons per hour at WOT... so 1 gallon or 4.5 litres for the Twatsoo or 1.5 gallons or 6.75 for the Mariner.

[henryfreston]

Originally Posted by Max...

For a small 2 stroke generally work on 10% of HP = gallons per hour at WOT... so 1 gallon or 4.5 litres for the Twatsoo or 1.5 gallons or 6.75 for the Mariner.

cruising at the same speeds you probably wont notice the difference between the 9.8 and the 15.