so I've been calculating it out...ignoring maintenance of 17 yr old motors...
:head::head::head:
Low price for gas at dock - $3 gl
Low price for 2 stroke oil - $.40 per gl of gas ($20gl oil/50gl gas)...Pennzoil $20gl...Yamalube is $50gl
---- low price of fuel $3.40 gl

Canyon trip burned 220 gl for 3 hrs out/3 back /4 hrs running around and trolling 220/ 10 = 22 gph

Expect to run 100 hrs /season = 2200 x $3.40=$7480

Lets say 4 strokes knock it down to 15gph x 100= 1500gl...x $3.40=$5100

Lets round it to $2400/year fuel savings

Pair of zuki 200s- $34,000/10 years...$3400/year- $2400/year fuel savings= $1000/year for new 4 strokes
:head::head::head:

If gas higher=more savings
if run more due to more canyon trips= more savings
If keep boat more than 10 years= more savings

:head:spending money SAVES money!:head: I wonder if my wife will buy that:head:

mawshj
 

2 strokes have a very small number of moving parts vs 4 strokes and are a lot more forgiving of gas contamination than4 strokes

i've got 420 hours on my 4S and i figure it's save me 3 gallons an hour, so thats 1260 gallons. at $3 per, thats $3780. im trying to get to 1000 hours so it will pay for itself.

when presenting to wife, feel free to reference this to her

good luck

I have ~1200 hrs on my DF140

Don't forget the added maintence costs of oil changes, filters, zincs, ring free, and so on when figuring your actual numbers. The cost of 2 stroke oil is pretty much offset by the cost of oil changes. I see where you're going with this presenting it to your wife, but be honest with yourself. And if your props are as bad off as you're saying they are, you can probably get a new set of props and reduce your current fuel consumption. The only real advantage I see is newer power and the hope of increased reliability, and if you do sell it, there will be a large increase in resale value. So they each have there pros and cons. Personnally I would get what you have fixxed, setup, working 100%, and run it like it is for a year or at least 3 months to see if it's the boat for you and if you will still be using it as much as you hope to after the new wears off before I would repower. I know that the idea of repowering is very tempting right now as many dealers want to move inventory in the off season and are willing to deal. But I would spend some time with it before I went sinki,g more money into it than you bought it for for a pair of new engines.

:head::head:
8(?) qts x 2 motors = 4 gallons of 10W40=$20x4=
$80 per year + (2 Suzuki oil filters x $19=$38)=
$118.

$20/gl 2 stroke oil x 2200 gl gas per year/50 (50:1 ratio)= 44 gl of oil x $20=
$880...for 2 stroke oil per season...that can't be right???

Ring Free need for 2 stroke - forgot about that...
WOW :cen: $50/qt for every 320 Gallons of gas...2200 gl(expected gas per year)/320 about 7 quarts x $50= $350/year

$118 vs $1230

I like the new engine smell myself, but I'm with Ferm, get your props right and run the heck out of those ox66s for a couple of years. You can always repower. To me it doesnt make sense to remove clean good running engines.

But then what the heck, its your boat, if new makes you happy, its only dirty green paper and you fish enough to get return on the investment. Even if just on the personal satysfaction side of things.

Reconsider ?

Evinrude offering 10 year non declining warranty on their G2 Etecs.

Power and performance of 2 strokes.........plus the rather amazing features of these G2's
and fuel / oil economy..

I know I want one hanging off the back of my boat. If only I could afford it.

its all about time. 17 year old motors there is a good chance of needing to do major repair or replace at least one in next few years. If I'm keeping long term, I might as well have new motors and spread the cost out over time than run old motors for years and be forced to buy later anyways...
That said, unless some lottery numbers come in, I'm running it next year with these and making a decision about the boat. That will inform my decision about the motors.