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Old 10 February 2006, 16:09   #11
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Country: UK - England
Town: Reading, Hants
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Make: Sealine F43
Length: 10m +
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i have the yam 9.9/15

it started life as a 9.9 but if you move the second throttle stop out the way and then change the reed block for the 15hp one then hey presto you have a 15hp, they are both identical engines, also i would recommend going for a 12 pitch prop instead of the 9 it comes with unless you have lots of folks on the boat all the time. it is a brilliant engine, starts super easy, uses hardly any fuel, sounds nice, very smooth and quiet, well made, in your search look for either the 9.9 or 15 to widen your scope and then modify it up to 15

dont go for a fourstroke or a 8 hp as you will regret it when on the water tearrassing along having huge fun
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Old 10 February 2006, 16:23   #12
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I have a Suzuki 15hp on a quicksilver 310 - very pleased with it - will plane easily with 2 adults and 2 kids on board - does help to move weight forward until on the plane though.

The Suzuki is a great engine but if you intend carrying the boat/engine around inside a car you may be better off with a 2 stroke.

My Suzuki sips fuel - did 40 mile round trip on less than 3 gallons - amazing!!!

As someone else mentioned the launching wheels are really handy - make life so much easier.
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Old 11 February 2006, 04:18   #13
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Quote:
Originally Posted by petren
With the Yam8, on your Avon310, how many did you manage to plane with? what is the weight of your boat?
The boat weighs 43kgs, not much more than your inflatable. Planes easily with just me but will not plane at all with another large adult + labrador, which probably equates to your full load! As Codders says, you have to be careful with chucking 4-stroke engines around in the back of cars due to the oil finding its way into places it shouldn't. Noise and vibration differences between 2 and 4 strokes at this end of the horsepower scale are negligible, despite what the dealers all try and tell you. My Yam 8 is actually quieter and smoother than the F4 I used to have. The 9.9/15 is better again.
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Old 11 February 2006, 06:49   #14
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Country: UK - England
Town: Reading, Hants
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Make: Sealine F43
Length: 10m +
Engine: 2 x 370hp
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here is my 15 yam, has been a perfect engine and runs like a dream, very smooth, has some light scratchs from lifting in and out of the car boot and lots of travelling but otherwise perfect condition. cant recommend them enough over other 15hps on the market, nice and light too. Much better than my evinrude.
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Old 11 February 2006, 10:27   #15
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My 10' Avon runs really well with 2 adults on board and a bit of kit, powered by a 9.9 Evinrude. I previously used a 6hp Suzuki, but this struggled to get onto the plane, so I'd recommend 9.9hp minimum, especially if you are buying new and have a wide choice of options. As other folks have said, if you can afford the extra cost, go for the 15hp. Remember that the 9.9 and 15 weigh the same, (same engine), so if you can justify the extra cost, go for the 15, or buy a 9.9 and carry out the mods Hugh Jardon did to his - will probably be cheaper for you. You don't have to use all of the horses, but if you go for less, you'll always wish you had more!
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Old 11 February 2006, 11:33   #16
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to mod a 9.9 to a 15

30 quid for reed block
5 quid for 15hp stickers front and rear
pair of pliers for the second throttle stop

if you put on a 12pitch prop then this is around 55-60 quid for genuine yam item

and there you have it

he he
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Old 11 February 2006, 16:49   #17
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I'm all set. Now thinking about how to move it around

Thank you all who posted answers. They were REALLY heplful. I just went today to the Yamaha dealer and told them to forget about the 8HP upgrade and get me right on the 9.9/15 2 stroke. They said they will mod it free to 15 for me. They also told me I will never have to worry about power with this baby on my Zodiac C340FR.

That is a big relieve. I'm so happy I found this forum!!!

However I still think the 36 kilos on the Yam 9/9/15 2str will be a hassle in long term so I will have to invent something for launching wheels since I cannot mount any due to the planning flaps positioned on the transom. Besides, I hate drilling extra holes in my transom.

I ordered a kayak cart at www.roleez.com and I'll let you know how I managed to get it on and off while launching the boat.

Also, for transportation on a trailer, do you guys worry ever keeping this engine installed on the transom? wouldn't this be to heavy when running over bumps for the transom on a rubber boat? Or you support it somehow underneat? I'm just afraid it will not be too healthy for the transom in long term
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Old 11 February 2006, 17:51   #18
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Quote:
Originally Posted by petren
Also, for transportation on a trailer, do you guys worry ever keeping this engine installed on the transom? wouldn't this be to heavy when running over bumps for the transom on a rubber boat? Or you support it somehow underneat? I'm just afraid it will not be too healthy for the transom in long term
You're right to be afraid - don't do it! Just accept a bit of hassle loading the engine in and out of the car, it's not like you're short of helpers
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Old 11 February 2006, 17:52   #19
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glad you found the advice useful

i would be tempted to remove the engine but i dont tow the boat myself so i always remove it myself,
with regards to launching wheels i use them and they are superb for walking down the beach, launching then pulling the wheels up and off you go

hope you have a lot of fun

also consider the prop size and if you want high speed and easier cruising consider a 12 pitch
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Old 13 February 2006, 21:49   #20
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shop manual for the Yam 9.9/15

[QUOTE=Hugh Jardon] to mod a 9.9 to a 15

30 quid for reed block
5 quid for 15hp stickers front and rear
pair of pliers for the second throttle stop

if you put on a 12pitch prop then this is around 55-60 quid for genuine yam item


Hugh, would you happen to have or know where a shop manual for the Yam 9.9/15 2stroke can be downloaded? I already downloaded the user manual.

Thanks,

Nick
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