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Old 15 July 2018, 05:50   #1
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Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Mariner 9.9 2018
Join Date: Nov 2007
Posts: 3,997
Mariner 9.9 - New 10hp outboard choice.

OK so a modest 9.9hp may not be the most exciting OB to report on but the info may help someone in this market...

As mentioned elsewhere I needed to trim some weight and bulk from our Suzuki 20hp with an OB downsize to the 10hp range. All new mainstream models were considered inc the possibility of a "commercial use" 2-stroke. For reasons of being busy and stressed in other life directions at the moment I wanted the simplicity of trading in the Suzuki.

Quickly decided to stick with 4-stroke despite the surprising encouragement from a couple of Tohatsu dealers to have an old model 2-stroke for "my business"! So the factors that came into play were...

Yamaha 9.9: Bit up on the lowest 10hp weight, bit up on price and only local dealer I'd have used didn't want to trade the Suzuki.

Suzuki 9.9: Not very keen on the odd gearchange which is the very end of the tiller twistgrip, and weirdly neither Suzuki dealer would even quote a trade on the old 20.

Honda 9.9: Almost as heavy as a modern 20hp and expensive. Local dealer refused to take Suzuki in.

Mariner 9.9. Decent weight, price and a brand that has served me well over decades.

Tohatsu 9.8: Very closely related to the Mariner 9.9 but without the Mariner's "clever" tilt/trim mechanism or the gearchange on throttle. One nearby Tohatsu dealer refused to take the Suzuki in but would sell Tohatsu very reasonably. Other local dealer offered a nearly acceptable deal which I initially refused... then another sales guy phoned to sweeten the deal enough for me to agree... then at 10pm the night before I was due to go over and do the swap the "boss" emailed to explain the other guys had made mistakes on pricing and I would need to add £150 more to the deal. Obviously I refused... crooks.

In the end I went with a very small one man band Mariner dealer nearby who was totally straight re the deal, shook hands on it, I left the Suzuki with him and 36hrs later collected a fresh from the importer Mariner 9.9 with a full demo and run-through.

So I now have this...
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Old 15 July 2018, 05:58   #2
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
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A few different angles...
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Old 15 July 2018, 06:05   #3
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Country: UK - England
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Posts: 3,997
Of course I'd had the advantage of using a 10yr old 8hp version of this (perhaps just different carb?) on holiday for a few days so was quite familiar with the design and knew the 9.9 performance would be acceptable for this next phase of smallcraft boating.

It has an 8.5" pitch prop which I think will be fine given we have found a 10" on a 20hp and 9" on a 15hp ideal.

I am slightly indifferent to the Mercury/Mariner gears on throttle twistgrip arrangement mainly due to the one downside I'd experienced with it on the 10/15hp 2-strokes... if you'd flooded the engine or it was running uncertainly at idle you couldn't rev to clear without them going into gear. You had to take the hood off and manually move the throttle cam on the carb. But on this current model as the 8hp we tried there is a cut-out button on the side that disengages the gearchange so you can rev the engine freely. Very handy.

They have slightly changed the hood shape on these latest models. Also deleted the primer bulb that used to be next to the choke as apparently it splitting when aged was regarded as a reliability issue.

The only other difference I could notice was the rather neat way the tiller can fold right down as well as up which helps if fit in the car loadspace… see pic below.

This model can be transported on one of its sides or down forwards resting on the transom clamps.... added to the fact it is overall shorter than the Suzuki 20 due to far less hood bulk so will fit the car loadspace crossways... all making it easier to pack for travel.
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Old 15 July 2018, 10:55   #4
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Country: UK - England
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Posts: 3,997
Just fitted the same mini tach/hour meter as I used on the Suzuki. I have found these last so much longer under the hood.

Just before fitting that I gave the OB a run round the tub. Lighter pull than the Suzuki 20 and so far just as much an instant start. Idles near silently and has greater mounting flex than the Suzuki so less vibration through the tiller.

Looking forward to getting out and running it in.

Usual 10hr total break in period... 1hr half throttle... 1hr three quarter throttle... remaining 8hrs as normal except avoiding lengthy periods wide open.
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Old 15 July 2018, 13:49   #5
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Country: UK - England
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Make: Honwave T38
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That all looks and sounds very nice. Can you let me know the dealer you used please. On here, PM or email whichever you prefer. We're still looking for something larger than the Suzuki DF6 so I might see if he wants to do a similar deal ! Thanks PG :-)
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Old 15 July 2018, 14:28   #6
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Country: UK - England
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Pete it came from Greg at GB Watersports in Peterborough. A tiny setup down a yard at the side of an end terrace in town but an official dealer. I've known him in town at different locations for 30yrs or so. Very relaxed and down to earth to deal with. David
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Old 15 July 2018, 14:59   #7
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Prefect. Thanks David. Good luck with yours.
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Old 15 July 2018, 15:16   #8
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Country: UK - England
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Boat name: Spy-sea-one
Make: Mercury
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Great looking motor david looking forward to performance write up
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Old 15 July 2018, 16:23   #9
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Looks very nice Fenlander, so what is the weight on this compared to your 20?

Also, may be a dumb question, but how do you use the tiny tach if it is under the hood?

Cheers,

Paul
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Old 15 July 2018, 16:34   #10
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Country: UK - England
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Length: 3m +
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Join Date: Nov 2007
Posts: 3,997
With the Suzuki I had the Tiny Tach on the tiller for a few outings until I'd sorted the prop pitch... but despite being sold as waterproof they do tend to mist up. So once the need to see the revs was sorted I put it under the hood and just used it to record hours logged.

On this Mariner I'd be pretty sure the 8.5" pitch prop will be fine so will be happy to judge revs by ear... or when run in on a calm day just pop the hood off for one max speed run to check I'm getting the revs. Then use it as before as an hour meter.

On paper some might consider the weight reduction 9.9 vs 20 minimal and if you were free from a creaky back quite insignificant. But the saving is about 15lbs and to me that is an amount that was taking me over my comfort zone. It's about the bulk too. The Mariner hood is so much smaller, the handle better balanced etc so overall there's a useful improvement.


>>> performance write up

Hmm "performance" may be over stating it a bit Jeff!
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