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  15 ft sport---60 hp 2 or 4 stroke?

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Author Topic:   15 ft sport---60 hp 2 or 4 stroke?
crbuckjr posted 04-17-2002 12:57 PM ET (US)   Profile for crbuckjr   Send Email to crbuckjr  
I am restoring a 15' sport. Out lake has 60 hp limit and I want to water ski with this boat. Can the Sport safely handle a 60 hp Yamaha? Comments about 2 or 4 stroke? The 4 stroke weighs 244 lbs vs. 228 for the 2 stroke. Is that a problem? Thanks!!
bc posted 04-17-2002 06:42 PM ET (US)     Profile for bc    
I would place my vote for the 70hp two stroke hidden under a 60hp cowling!
lhg posted 04-17-2002 09:05 PM ET (US)     Profile for lhg    
Before you make your decision, see the current thread on powering a Montauk, for the engine specs listed on 60's and 70's. I'll bet a 60 HP Merc 2-stroke will run with a 70 HP Yamaha, and you'll be legal, and save many bucks at the same time. If you want to go 4-stroke, consider the Mercury 60, since it is electronically fuel injected. The Yamaha isn't, and won't have as good throttle response. With 4 strokes, you REALLY want to have trouble free EFI, like the autos. Everybody who has them seems to love them.

Disclaimer: I own Mercury's!!! And Yamaha's are excellent engines, obviously. But in your limited power range, they are a strong player, and their specs and technology can't be overlooked, regardless of brand loyalty.

Bigshot posted 04-18-2002 11:09 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I personally agree with Larry. get the 60 Merc EFI 4 stroke. You will not be disappointed. They are sooooo quiet and run on air. I woulld rule out the 60 Zuki due to weight and if skiing I think you will need the 60 over a 50hp. If you plan on keeping this for a while....do the 4 stroke.
TightPenny posted 04-18-2002 02:04 PM ET (US)     Profile for TightPenny  Send Email to TightPenny     
I have a 60hp Johnson on my son's (I gotta get used to calling it that) 15' Sport. The boat handles the engine well.

As to skiing, when I was younger and in my low 200#s, that boat had a 50 hp 1974 Evinrude (2cyl). We never had a problem skiing off her, and that old 50 looks a lot like what is now called a 40.

Bigshot posted 04-18-2002 02:21 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
True! I had a 1988 48spl on my 85 15' SS and she cooked but I am assuming the 50 4 stroke might warrant stepping up to a 60 if skiing.
mudpuppy posted 04-18-2002 04:18 PM ET (US)     Profile for mudpuppy  Send Email to mudpuppy     
My 87 SuperSport Limited is powered by a 60 hp merc and a 4 hp Johnson kicker with a 17 gal fuel tank. Top end with two guys is about 35. Probably adequate for using two skis but literally a drag with a slalom ski.
crbuckjr posted 04-19-2002 10:23 AM ET (US)     Profile for crbuckjr  Send Email to crbuckjr     
So, do I understand correctly that Merc's have more oomph than Yamaha's at the same HP rating? Why is that?

Then, what about reliability? Y's just seem to have a far better reputation.

Bigshot posted 04-19-2002 10:57 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Mudpuppy is that 60 the old 70hp 3 cyl with the clamshell cowling? If so the newer ones have much more power and speed. A newer 60 will probably fetch 42mph or so considering a 70 will do about 47.
lhg posted 04-19-2002 02:41 PM ET (US)     Profile for lhg    
The Mercs seem to have more displacement, and larger alternators for electronics than Yamaha's in your HP range. Generally, HP for HP, a Merc is faster than a Yamaha. Just look at who owns the bass boat, go-fast and racing markets.

Yamahas more reliable than Mercs? Who knows, and is probably related more to owner care and maintenance, but Mercury has over 50% of the outboard market, and Yamaha about 20%, so those figures don't support what you're hearing, unless 50% of the world's outboard buyers are just plain stupid, which I doubt. I think it's an advertizing myth, which helps justify smaller displacement mid-range engines at higher prices. I believe all outboard brands are about equal on reliability, short of the risk a getting a "lemon", or a new technology glitch like happened with some of the DFI's, which can happen with any brand. The engine manufacturers are starting to say that they expect a 4-stroke to have a longer useful life than a 2-stroke, in spite of the greater number of moving parts. Time will tell on that one.

where2 posted 04-26-2002 01:14 PM ET (US)     Profile for where2  Send Email to where2     
Check the #'s again on the 2 Stroke. My 2 stroke 1985 70Hp OMC weighed 230lbs, before I added the PTT. With PTT it's in the neighborhood of that 244lbs you say the 4 stroke weighs (factory books says 250lbs for mine with PTT). The 15' Sport was rated for upto a 70Hp 2 stroke, so 60hp is fine. My 1985 15' Sport has a 70Hp 2 stroke, and will run 50mph.

Get the 4 stroke 60Hp Yamaha, and enjoy the boat...

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