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Old 22 September 2018, 03:59   #1
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Country: UK - England
Town: Ipswich
Boat name: Click and Collect
Make: Valiant and Narwhal
Length: 4m +
Engine: Outboard
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My New 15 HP

Before I could get round to testing to see how well my 9.8 Tohatsu 2 stroke (27KG weight) would plane my new Honwave T38IE another of the Holy Grail of engines became available only 20 miles from me (which in its self is a miracle) So I decided to add to my equipment this 15HP 2 Stroke Mercury (34KG) which I am certain will plane the T38ie well.

It is ok to lift and carry a short distance.

I got it for what I consider a good price and it seems to run well and pump water fine. Real test will of course be on the water.

The tick over is a little fast but I can sort that and it backfires a couple of times when first started but that soon settles down. My 60 hp on my rib does the same

Heres hoping it will be a good purchase. Short video of it running



Dennis
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Old 22 September 2018, 04:27   #2
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
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Engine: Mariner 9.9 2018
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BP a desirable motor and looks genuine condition. I've owned three so know them well.

If it pumps water like that at a normal speed idle looks like the thermostat has been removed because their proper tell-tale behaviour at idle is to have an erratic stream showing the stat is working.

None of them backfired at all... they were very even tempered for a 2-stroke. So I'd be thinking of a routine look over with new plugs, check leads, check timing, set idle to correct speed, set mixture and check it has a stat.

But these are minor things for a new to you OB... they so often need checking through even if from a dealer.

Look forward to hearing how it goes on the T38.
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Old 22 September 2018, 04:31   #3
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Quote:
Originally Posted by Fenlander View Post
BP a desirable motor and looks genuine condition. I've owned three so know them well.

If it pumps water like that at a normal speed idle looks like the thermostat has been removed because their proper tell-tale behaviour at idle is to have an erratic stream showing the stat is working.

None of them backfired at all... they were very even tempered for a 2-stroke. So I'd be thinking of a routine look over with new plugs, check leads, check timing, set idle to correct speed, set mixture and check it has a stat.

But these are minor things for a new to you OB... they so often need checking through even if from a dealer.

Look forward to hearing how it goes on the T38.
Backfire was only 3 - 4 times after start. I will test it first before I start pulling it about. I am a great believer in if it aint broke don't fix it
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Old 22 September 2018, 04:32   #4
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I assume it is 50:1 Mix Petrol.


I was also running it on quite old fuel to be honest
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Old 22 September 2018, 04:45   #5
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Double check but all mine were 100:1 with handbook advice to run on 50:1 for commercial use. I ran mine around 75:1 to 80:1 as the best balance. They had 100:1 stickers on them.

Yep get fresh fuel for your outing before you judge it fully.
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Old 22 September 2018, 04:55   #6
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Tested it in my make shift tank to shift into forward and reverse. All seemed to work ok but I have to urn it slightly to reverse and then back a bit again to shift into Neautral. Cant see a sticker on it re the fuel mix. Lost in the mists of time I suspect. Once warm it starts a dream (half a pull) with no backfiring.


I agree the tell tale is rather fast I will check if it has a thermostat.


Smoke a bit but then I find that with all 2 strokes in a test tank


Dennis
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Old 22 September 2018, 05:12   #7
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Found what I am pretty certain is the instruction manual for this engine


http://www.baads.org/wp-cms/wp-conte...nual_PART1.pdf


On Page 1A-3 It says 50:1 mix assuming this is the correct manual


Dennis
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Old 22 September 2018, 05:34   #8
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Plumb I have the same engine, I will check what mine says on it for you later today
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Old 22 September 2018, 06:09   #9
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Plumb I have the same engine, I will check what mine says on it for you later today
That will be very useful thanks.

Dennis
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Old 22 September 2018, 06:09   #10
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>>> pretty certain is the instruction manual for this engine

You can't go wrong re keeping the oiling up to scratch with 50:1 when not sure but where approved for 100:1 I found they trolled for periods better nearer 75:1 and of course less smoke.

It did depend on year with the later ones being 100:1. If you download a 1997 manual it refers to 100:1. The manual you have linked to is for 1986-on models.

So to be sure if interested in running a little less oil you need to know the age of yours.
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