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Old 01 September 2003, 23:06   #1
Country: Canada
Town: sidney b.c.
Make: Hurricand 630
Length: 6m +
Engine: Suzuki DF 225
Join Date: May 2001
Posts: 50
yamaha f100 vs f115

i currently have a 5.5 meter zodiac with a f100. i have had the motor 4 seasons (600 hours) and i want to repower. I feel that the boat is slightly underpowered with the f100 (top speed 35 knots) and wonder if i would see that much difference with the f115. Does anyone have a f115 on a similar boat? looking forward to your replies. Chris

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Old 02 September 2003, 00:50   #2
Country: Canada
Town: cowichan valley
Join Date: Dec 2000
Posts: 70
wait for the 150 4 stroke that will make it move

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Old 02 September 2003, 03:09   #3
Country: UK - England
Town: Lymington Yacht Have
Boat name: Various
Make: Cobra
Length: 10m +
Engine: F225 Yamahas
Join Date: Apr 2003
Posts: 36
The F115 is a superb motor, very smooth instant power and does not compare to the F100 at all. We have had both.
The F150 is available now as I have seen several already fitted to craft here in the UK.
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Old 02 September 2003, 06:29   #4
Country: Ireland
Town: Dublin.
Boat name: Tender 2.
Make: Valiant DR 600
Length: 6m +
Engine: 150 Optimax
MMSI: coming soon !
Join Date: Oct 2002
Posts: 443

I have a mercury 115 two stroke on the same boat and it goes like shit off a shovel. Go for it !
Fast... Very feckin fast please.
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Old 03 September 2003, 04:19   #5
Country: Sweden
Town: Stockholm
Boat name: Osprey & Ring
Make: Osprey & Ring
Length: 9m +
Engine: Plenty
Join Date: Mar 2003
Posts: 860

I think you should go for the 115, the diffrence between a 100 and 115 is that the 115 is an injection engine and the 100 is an carburator engine, with the right prop you should point at 40 knots, the weight of the 100 is 164 kg and the 115 is 195 kg, wich means that the 150hp will probably be a little bit to heavy for a 5,50m boat (around 211,3kg) does`nt sound much but after the transom the weight effects the boat more than inside the transom, maybee even the 115 will be to heavy, check with Zodiac before doing anything, in worse case the boat will go even worse if it`s to heavy, offcourse you can compensate with weight in the front but that`s not an recomendation.
Also the difference between the engines is that the injection four stroke almost has an acceleration of an two stroke engine.

Good luck

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Old 03 September 2003, 07:08   #6
Country: UK - Wales
Town: Milford Haven
Boat name: Various
Make: Commercial
Length: 10m +
Engine: Screw / Voith / Jets
Join Date: Sep 2002
Posts: 791
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Have you considered the Suzuki range of 4-stroke outboards? - the 140 for instance weighs less than the 115 Yamaha if I remember right.... it's also deadly quiet when running at lower revs, and the 90, 115, and 140 suzuki engines are all efi by standard anyway.

Just a thought

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Old 03 September 2003, 11:38   #7
Country: UK - England
Town: London + Brighton
Boat name: TIPS
Make: Avon Adventure *FOR SALE*
Length: 5.6m
Engine: 115 Yamaha 4-Stroke
Join Date: Apr 2002
Posts: 50
we've got a Yammy 115 four stroke on the back of a 5.6m Avon adventure (up 4 sale), the engine is ace, extremely quiet and smooth, acceleration is also very good. we use about 20 litres for a good days use, thats with watersports as well. Top speed is around 42 knots 1 up on the absoulte carm, at around 5800 rpm. it will go higher but I won't rev it any further until it has a more suitable prop.
We use about the same amount of fuel, if not slightly less that our 2001 mercury 60hp 2-stroke on 5m Zodiac YL.

I probably wouldn't upgrade to the 115 tho if I was you though, I doubt you will see a considerable increase in top speed that justifys the additional expense. If you do though, opt for a different prop than the standard 13inch, 19 pitch ally prop.


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