70 HP Yamaha 2 stroke V 60 hp fuel injected Yam

[dnej]

Tossing up to buy a new 70 hp Yamaha 2 stroke. Have been told to have a look at the 60 hp 4 stroke, fuel injected.Yamaha.
As we are comparing two different HP rating, is it likely that the a 60 hp, efi, would put out as much umph, as the 70hp 2 stroke.
Surely hp is hp, but in this day and age, perhaps new technology, can compensate for the HP difference.
Any comments
David

[toymod]

70hp is 70hp and 60hp is 60hp......me thinks ::) so I would think it depends on if you need better fuel effeicency or not, or a bit faster boat ;D

I would go the 70 as I feel the need the need for speed :D

[the_matrix]

David,
Toymod is right mate, HP is HP.
Ive owned a F60 Yammy CETL, and it was a quiet, efficient, reliable motor. Two stroke power is different to four, and a F60 is never going to be more powerful than a 70, whether its a two or four stroke.
What you need to weigh up is the rising cost of fuel, the quiet purr, and the turn key start that four strokes offer, against the holeshot that a 2 stroke can deliver. Injection on the four strokes have bridged the gap a little, but there's no doubt where the two stroke holds the advantage.

I converted to 4 strokes two years ago, and as the saying goes, "Never say never", but the smooth running and incredible fuel economy that the current crop of fours offer, make it incredibly hard for me to ever consider going back.
Each to his own, but Im sometimes sure that my Yammy F115 has a secret fuel cell somewhere, its incredibly fuel efficient! ;D
Good luck with your purchase.
Jason

[dnej]

Jason,,

Thanks for confirming my opinion. Couldnt see how a 60 /4 would outperform a a 70 /2.

I am wanting to upgrade from a 60 2 stroke, 105 kg, in order to have more power, so if I go 4 stroke, I will need to go to an 80 hp Yamaha. Weight 172 kg.
Going from a 60 hp 2 stroke to an 80 hp 4 stroke, there is 66 kg difference.
However going from a 60 hp 2 stroke,( 105 kg,) to a 90 two stroke, there is a difference of only 17 kg.

The pods I had fitted, carry an extra weight of 80 kg each, or 160 kg total.

I added an extra battery,bait board, and my fuel is stored under the well, under floor, so some of 160kg has been taken up.
So do I go 80 4 stroke, or 90 2 stroke?

Is an additional 66kg, too much extra weight.
Boat is 17 feet,cuddy, aluminium pressed hull, weighs about 550kg, not loaded, no motor, now with pods, length is about18.5 feet.
Any comments appreciated
David

[dnej]

Just a refresher

[Paul_Kenny]

Hi David
I am Looking at buying my first boat so have also been doing the reserch. I have been told that the four strokes have less grunt (take longer to get up on the plane) than 2 strokes so it depends what you plan to use it for.
Water sking I have been told to go for a 2 stroke. You can also look at the new Johnson / Eninrude Etec a fuel injected 2 stroke.
If you plan to use it for fishing and cruising than i would definlitly go a 4 stroke.
Hope this helps! :)

[the_matrix]

David,
Thats a tuff one mate! You definantly dont want to have an arse heavy boat, there's nothing worse.
All I can suggest is to try and shift some ballast towards the bow, to even it out a little.
As far as what to buy, without seeing the boat its a bit hard to say. Im sure the boat dealership you are going through will be able to give you the pro's and con's.
Good luck with the purchase.
Jas