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I would entertain any comments concerning the 4 Stroke 115HP Yamaha (fuel injected) and the 150HP Yamaha (non- fuel injected) pushing a 19.5 Sea Pro. I Have the option between these two motors for my purchase, and I'm certain that the fuel efficiency on the 115HP motor is alot better than the 150Hp motor, but would I truley under power the boat if I selected fuel efficiency over 35 more horsepower. The dealer states that I'll only lose 4 to 5 miles per hour if I went with the 4 stroke, but I gain 40% more fuel efficiency over the 150HP Yamaha. Thanks in advance.
hello,
why don't you try a 140 four stroke it's just a little bit more money and they are very reliable and if you do a good surge Ithink you can find one for the price a dealer is about to ask for the yamaha and you don't have to work it so high in RPM and that also saves fuel and engine.
greetings from holland
marti
Thanks for your feedback Marti, I saw the 140hp Yami and started to ask what the difference would be in price if I were to go with that particular unit instead, but I got side tracked while viewing the many options the Sea Pro offered. Thanks again Marti. Greetings from Virginia, USA
I have the 115 4 stroke on a 19 foot center console. I took an old ragged 150 off so I don't know if this is a good comparison. I went from 8 gallons an hour to 2.5. Now I'm spending more for bait than gas. My gph numbers were from dividing hourmeter hours into gallons at the pump when I fill it. It does 42 mph on the gps. Yamaha also has a new 150 4 stroke available next month. I'd go for a 4 stroke one way or the other, no matter who makes it.
the F115 will push your boat, but will work harder doing it. check on the weight of the 140 vs the 150 though, make sure your rig can handle it. also, you'll definately want to take a ride in a boat rigged similarly to yours to confirm your decision
I have a 115hp Yamaha 4str on a 17'Capehorn. Hull wieght about 1700#. A speed demon it ain't! But it sure is easy to stop and fill up with regular gas and no oil. As of right now I can not give a good estimate of fuel consumption because I lack the instrumentation, but with a 42 gallon fuel tank it seem that I have more fuel tank then I need.
I am not sure about the wieght of the 19' Sea Pro but if I remember it is a little lighter then my Capehorn so your top speed would be higher with better fuel over all fuel economy.
To be sure I second Marti's suggestion, you should check out the Suzuki/Johnson 140hp 4str. Or the new Yamaha 150hp 4str.
On this and other forums I have seen mention of the Seapro having problems with the added wieght of the 4str engines, don't have any first hand experience or knowledge, but you might want to do a search on it for info.
I can give exact numbers. Key west 1900CC with a F115.
Offshore 80.5NM for the day and 15.1 gallons
Next Day 89.3NM and 16.5 Gallons, and NO OIL either day. I don't have an oil film on any part of my boat, I don't have oil bottles in my garage. I cruise at 25ishNMPH at 4000ish RPM's and get roughly 5ish NMPG. WOT is so far 37.2NMPH. I'm sure a 150 would push it faster, I can't imagine it getting better gas mileage. Also a 150 is a 6 banger and is a little heavier than a F115. The F150 is about the same weight as a 6 banger so that is almost a wash except for NO OIL.
William
1900CC Key West W/ 115 Yammie 4 stroke
Biggest boat that would fit in my garage!
hello again I don't now where the weight thing is comming from but thecarb 150 yamaha weights 420lbs and the 115 4 str 400lbs and the 140 suzuki and johnson 410 lbs thats all dry without prop so with the 150 youadd the oil thing and oil and with the 140 you add oil.
the weight on the 19 feet seapro is very different because of the many models they have.
btw the 150 efi yamaha weights 444lbs.
greetings from holland
marti
Somethin-fishy, how much does your key west weigh, with allyour equipment, fuel and people? The reason I'm curious is because the boat weighs 2000Lbs dry, and 42 gallons of fuel @ 6Lbs per gallon equals 252Lbs, plus another 200Lbs of gear, so before my family of 5 kids, the wife, and myself gets aboard the boat already weighs about 2500Lbs, and assuming my whole family including myself weighs around 850Lbs, give or take a few pounds, so the boat would top out at 3350Lbs, would you think the 115Yami would be suitable for us?
I don't know how many Yam carbed 150's are out there right now. I would hope the factory knows but I had one dealer tell me that the old Yam 150 has cost and stills cost the new motor dealers tons of money because they don't get replaced! They just keep on going!
If you want to save a couple of bucks (literally, just a couple of bucks)on gas.... go 4-stroke.
If you want join the noble experiment mandated by the EPA-s ( and park your rig in the dealers/service facility for a couple of week at a time).... go 4-stroke.
Want to go fishing and not worry about getting back.... go carbed 150
that depens on what you expect as "twentynine"said a speed demon it ain't and as Cgrand said take a trialrun in the boat you want and take your hole household with you LOL.
I would go for the 140 especially for the silent and no smoke for the kids.
marti
Here's your answer. Go to Yahama's website and click on Performance Reviews. Do this for both 2-strokes and 4-strokes. I will give you exact data (mpg, gph) for tests done with various boats. http://www.yamaha-motor.com/products...p?lid=5&lc=otb
I just bought a new 202 Sea Hunt and chose the 150 Carb motor over the 115 4-stroke for the same money.
By my calculations based on their data, about 33% better fuel economy with the 4-stroke (6.2 mpg vs. 4.1 mpg on similar boats), but I feel the 115 is underpowering a boat close to 2,000# dry. And I had great luck with my previous Yahama (80 HP carb). Hope this helps.
As a follow-up to my previous post on best fuel economy, consider that the 115 4-stroke is only going 26 mph to get 6.2 mpg vs. the 150 2-stroke is going 34 mph to get 4.1 mpg. If both boats were going the same speed, 34 mph, the 115 is burning 7.1 gph vs. 8.3 gph on the 2-stroke 150. Not much savings there.
Boats742, thanks for your input, I'll go to the site to see for myself, and what you stated about fuel efficiency certainly makes alot of sense. I'd rather be overpowered than underpowered in the 2000# range boat, and I'm willing to give up a few GPH, to get a better performance out of my boat.
From the "either/or" (115/4 vs. 150/2) comment and the "Sea Pro" comment, I'm assuming you're looking to buy from Ed's Marine?
Friend of mine ("POWHATANONE" - Rich) on this Forum got a "202 Sea Hunt" (center console) from Ed's with the "either/or" offering - he chose the 150/2-stroke and the motor has been nothing short of GREAT! With 3 kids, his wife, himself, and me onboard, with 58gals. of gas, the motor performs nothing short of EXCELLENT!
If your calculation of "3,350#'s" is correct (or even CLOSE!), I really don't think you'll be doing much except TROLLING with a 115/4!!!
If the fuel calculations that "boats742" put up here are reasonably accurate, the cost of running a 115/4 is VERY close, plus that 115/4 is gonna' work HARD to carry that much weight around!
Either wait for a 150/4-stroke or go with the 150/2-stroke! You'll be GLAD!
Yamaha 4 Stroke 115 HP vs. 150 HP Yamaha 
