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Old 28 October 2015, 03:59   #11
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Wow, brilliant thank you mate.
That looks a bit more promising.
When I get 5 minutes spare, I will go and see the marine mechanic armed with the part numbers, happy days.!!!
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Old 28 October 2015, 05:40   #12
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Do post how you get on. It will be interesting to see what a dealer has to say. Sadly from my experience there are many who just do not have the experience to really know what's needed for such conversions so prod about in the dark with no more understanding than an owner armed with the above links.

I'm guessing the new carb will be over 200 with a slight risk they get the wrong one which you would never really know. How will you tell if the upgrade produces 10.5hp, 12.5hp or 15hp?

Just taking a guess at 225 for a carb...

There's a Mariner 15 on here that looks tidy... 15hp Mariner Short-shaft Outboard 850

So if you reckon your 10hp would sell for 625+ then probably it would be better to buy that and sell yours. In truth I'd expect yours to sell for 850+ as next season starts so you could end up with a zero cost swap.
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Old 28 October 2015, 06:27   #13
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Great minds think alike....!

I have already seen that for sale. I am having thoughts about more power, because my last 'Quicksilver 380hd' that I very regrettably sold, (long story) had a 25hp 2/ Mercury on the back, and went like the proverbial, off a slippery stick...!

Since getting this QS 380hd, with the 10hp on, the words of Tim Allen, in 'Home Improvements' keep ringing through my head......'MORE POWER..'

But this is where it gets complicated, my father in law, also owns half of the boat...............

Sooooo, when I started looking at posts on here about changing this part and that part, and getting more power, I tend to get a little excited.
I am going to speak to my mechanic, and enquire whether it can be done, and how much, just out of interest, but will probably sit and wait, enjoy what we have, and buy a bigger engine when the chance arises.........or will I.....?
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Old 01 April 2016, 14:52   #14
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psycho - did you progress with this at all?
I am also interested in an upgrade, although I just spoke to an ex Merc empoyee, who told me the 10s are more like 12/13hp. Still don't really know if true, but will see how it compares speed wise to my 9.8 Tohatsu


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Great minds think alike....!

I have already seen that for sale. I am having thoughts about more power, because my last 'Quicksilver 380hd' that I very regrettably sold, (long story) had a 25hp 2/ Mercury on the back, and went like the proverbial, off a slippery stick...!

Since getting this QS 380hd, with the 10hp on, the words of Tim Allen, in 'Home Improvements' keep ringing through my head......'MORE POWER..'

But this is where it gets complicated, my father in law, also owns half of the boat...............

Sooooo, when I started looking at posts on here about changing this part and that part, and getting more power, I tend to get a little excited.
I am going to speak to my mechanic, and enquire whether it can be done, and how much, just out of interest, but will probably sit and wait, enjoy what we have, and buy a bigger engine when the chance arises.........or will I.....?
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Old 01 April 2016, 15:07   #15
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>>> just spoke to an ex Merc empoyee, who told me the 10s are more like 12/13hp

No disrespect to the guy but just look at the serial no sticker... what HP does it say? That's what it'll be +/- production variations.

Yes the Tohatsu 9.8 vs Mercury XR10 will be interesting... wonder how the prop pitches differ?

And the splash will be interesting as your Tohatsu suffered a fair bit on the riser block left on the old Aerotec... which was OKish with our Mercury 15.
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Old 01 April 2016, 15:21   #16
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No disrespect to the guy but just look at the serial no sticker... what HP does it say? That's what it'll be +/- production variations.
Yes, I kind of agree, but he said they were more powerful than the 9.9. I have never done that comparison; if it was sold as a 10, the plate would say 10 regardless of actual output. And neither of us can prove it either way, although your speed comparators between the (edit) 10 and 15 might suggest you are right?

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Yes the Tohatsu 9.8 vs Mercury XR10 will be interesting... wonder how the prop pitches differ?
No idea, just checked, but I don't see anything stamped on either of them...
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Old 01 April 2016, 16:19   #17
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Ahh that's the thing... the XR10 model designation was just a marketing name for a 9.9.

Below is an image of the data plate on my XR10 which clearly states it's a 9.9hp or 7.4Kw.

Anything more is all smoke and mirrors!
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Old 02 April 2016, 02:22   #18
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Yes, I also saw that, but to my understanding there is a difference between the xr10 and the previous 9.9

Previous 9.9 is same engine as the 8 and I think the 6, so a lower cc.

Xr10 is a downgraded 15 with a higher cc than the previous 9.9

Does that mean it develops more hp? Maybe not. More torque? Maybe. I guess I will never know for sure without measuring it.
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Old 02 April 2016, 04:36   #19
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Neil not trying to "prove" your outboard to have less power than you might have hoped... just this tech/mechanical stuff interests me.

Done some more digging with other forums, parts lists and the workshop manual to find more than before.

The carb swap due to the narrow throat casting as well as smaller jets on the 9.9/XR10 is a given. Found out the timing settings are unchanged between those models and a 15. But also found as well as the smaller carb there is a smaller exhaust outlet for which you need to take the powerhead off the leg and upgrade the casting which the powerhead bolts onto together with its integral exhaust tube.

See page 181/182/183 of the workshop manual here...

Boatinfo - Mercury Service Manual for 6-8-9,9-10-15 hp

... where items 10 & 11 are the adaptor plate and tube.

So it seems even with a hard to find used carb or very expensive new one there is still more invasive work needed to make it a true 15.

Of course you could well be right that much of the lower range grunt of the 15 would be present alreday in its XR10 guise. A dealer (lifetime marine industry owner not a fresh faced salesman) told me a good few years ago about the Tohatsu 6/8/9.8 2-stroke range which are all based on the same unit. Talking about the holy grail 9.8 he commented its extra power over the 8 was really only seen at its highest revs so that when popping onto the plane and maintaining a medium cruise speed the 8's performance was very close to the 9.8.
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Old 02 April 2016, 17:23   #20
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David no worries on the "proving" thing.
I am curious to find out if there is a positive performance difference to the 9.8, but I may never find out.
I also heard about the exhaust ports needing to be upgraded, last night. So for me, not worth the hassle. The Merc will be going on the market, it has to given I will collect a Mariner 25 tomorrow. Not looking forward to the higher weight, but won't be lifting it far or often. It should fly quite nicely in comparison to the 9.8 I'll just have to be light on the throttle
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