Yamaha 50 four stroke

[aquapower]

I have just bought a Yamaha 50 four stroke to go on my Ryds (15 feet), i would like to know what the fuel consumption should be and if you think the 25 litre tank will be adequate or if I should try to fit something bigger, I have changed the 2 stroke 60 for the reason that I have very little range and that am always re fuelling. I know the spec sheet shows consumption but would like to hear from experience and please warn me of anything I should be worrying about owning one of these engines.

 

[jfm]

Depends which version. Brand new EFI? I have the EFI version, 2011 model, and it is pretty economical. TBH while it reads out gph on the dash I can't remember the readings but it's in the order of 3 galls/hour going moderate say 3750rpm. I have a 10 gal tank and it takes me ages to use that, but it is only a tender rather than a long distance cruiser. Generally speaking it's a fab engine. mjf on here has one too. for distance work I would want 10 gallons (=45 litres) not 5 gallons. Also get the electronic guages (network plug and play things) then you have electronic fuel flow measuring all there ready set up

 

[Spi D]

Yamaha in Sweden publish tests of various boat/engine combinations. Annual publishing but not always latest model (guess they believe that there aren't improvements every single year).

I've inserted English text into the 2012 issue where Swedish seemed too strange:

25 liters will take you pretty far but I'd suggest a second tank anyway, at least for a more flexible refilling pattern.

 

[mjf]

Hi - yes I have one too as jfm says and delighted with it.

Very quiet and smooth looking at some figures - I keep a log but only just now reviewed the record.

It appears i manage only 8knots average which is a combo of fast 20Kn+ when past Wandsworth and more usually 5knots troll up to Richmond. Seems I get 2/3.5miles per litre and 2.5/4.0 litres an hour.

This is very rough indeed as the log has jammed often and I have not logged GPS. Also its tidal Thames so big flows, time spent alondside with engine at idle dropping off and picking up is included

The fuel gauge has 8bars from memory and appears accurate when I have brimmed my 50 lt tank. On trips out to the Barrier I have been surprised how economical the engine has been.

Obviously depends on use - jfm might reflect better as he uses his for blasts, towing and tender work which I guess will be fast too whilst mine is for river tootles on summer evenings...

 

[aquapower]

Thanks to all for your replies, my Ryds looks almost identical to the boat in the picture.
My engine is a couple of years old and don't think it will be an Efi, I will know more when it's delivered.
I will try to fit either two of the tanks as supplied with the outboard or my preferred option will be to have a custom make stainless steel tank made to fit the locker.
I will post some pictures of what ever I do.

 

[Spi D]

Depending on your options a transportable tank may make refilling easier. Separate tanks are better in case of contamination (provided only one is affected) and can be removed from the boat during storage.

Properly fitted & tied down they'll be as sturdy as a built-in. And way cheaper

 

[aquapower]

Depending on your options a transportable tank may make refilling easier. Separate tanks are better in case of contamination (provided only one is affected) and can be removed from the boat during storage.

Properly fitted & tied down they'll be as sturdy as a built-in. And way cheaper

I know what you mean, I would normally take boat on trailer to fill up as this eliminates upsetting the garage owner when you get the jerry cans out and try to fill them

 

[Dabhand]

I have a Yamaha F60 (EFI), bought new nearly three years ago, superb engine, smooth and quiet. Always starts first time, even last weekend when we had sub zero temperatures most of last week.
Used to have a fifty hp two stroke on a slightly smaller boat, the Yamaha's fuel consumption is around 60% what the two stroke used to use, so a good saving.
Only problem I have had is a sticky tilt indicator sensor, silicone grease soon cured that.

 

[aquapower]

I have a Yamaha F60 (EFI), bought new nearly three years ago, superb engine, smooth and quiet. Always starts first time, even last weekend when we had sub zero temperatures most of last week.
Used to have a fifty hp two stroke on a slightly smaller boat, the Yamaha's fuel consumption is around 60% what the two stroke used to use, so a good saving.
Only problem I have had is a sticky tilt indicator sensor, silicone grease soon cured that.

I would have bought a 60 if I could have found one, as it's the same weight as the 50 and that's as heavy as I can go.