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Author Topic:   New Yamaha on a 150 Sport
pgbj posted 09-08-2004 11:22 AM ET (US)   Profile for pgbj   Send Email to pgbj  
Any people out there got any experience of a Yamaha on a 150 Sport? (I guess we pay a 50% premium for a BW in the UK compared to US - but at least we get a choice of engine manufacturers!)

I'm looking at putting a 4-stroke Yamaha F60 EFI - the fuel injected version not the 4-carb one which I think is new in 2004? Any feedback appreciated.

Dealer quoted me for the 'High Thrust' version - don't understand why I'd want the extra push and lower speed on a 150 Sport? I notice that BW in the US have the 'Bigfoot' as the four stroke option too - is there a reason for preferring a high thrust version?

LHG posted 09-08-2004 02:11 PM ET (US)     Profile for LHG    
The engine you are talking about is a 100% Mercury US built engine powerhead, including the EFI. Yamaha secretly buys them from Mercury, since they have no offering of their own in that HP range (same for the 30's & 40's) Why not just get the "real thing" factory installed from Whaler and be done with it? You'll save a lot too.
Moe posted 09-08-2004 02:22 PM ET (US)     Profile for Moe  Send Email to Moe     
The 60HP Yamaha four-stroke is a Mercury motor, previously carbed, but now supposedly with the Mercury EFI system. Last I checked though, the Yamaha website showed the high thrust 60HP as still carbed.

The high thrust/BigFoot versions have 2.33:1 gearing, and even with that, need a 13" prop to get max rpms with a heavy load. The smallfoot Merc (and I assume Yamaha) have 1.83:1 gearing, meaning a 10" prop would give the same numbers as 2.33:1 with a 13" pitch. However, the 10" small diameter prop might overrev because of the higher slip generated compared to the large diameter prop.

I don't know why Boston Whaler uses the BigFoots on their smaller Whaler where possible (not the heavier 4-cylinder 40HP BigFoot on the 130), but I have to believe they've done some testing and know what they're doing. It may well be the benefits of the lower (higher numerically) gearing and larger diameter/greater pitch prop more than offset the increased drag of the larger lower unit.


pgbj posted 09-08-2004 05:02 PM ET (US)     Profile for pgbj  Send Email to pgbj     
Thanks. I knew that Mercury used the Yamaha powerhead on some of their models - didn't realise that Yamaha had repaid the complement on their mid-range EFI. I'll go back and look at the numbers - I think the Yamaha pre-rig was at least $400 so that's a start.

Still a bit confused on the high thrust. I was hoping to do a bit of skiing (as well as fishing etc) on the 150 - just the kids on two skis - is the bigfoot going to help or hinder. I have it in my head that a lower pitch prop like on the normal leg is going to get them up quicker?

LHG posted 09-08-2004 05:12 PM ET (US)     Profile for LHG    
If Boston Whaler is installing the Mercury 60 EFI in Big Foot version on the 150's, as Moe indicates, that's what you will get if you take the boat factory rigged with Merc. Don't let the Yamaha dealer confuse you.

You might check out the specs at

Peter posted 09-08-2004 08:07 PM ET (US)     Profile for Peter  Send Email to Peter     
The 150 Sport is not light by classic Whaler standards and the kids won't be on two skis for long. Thus, on the 4-stroke 60, the high thrust gearcase's ability to turn a larger diameter propeller would serve you better for water skiing, particularly when the kids start skiing on a single ski. Your Yamaha dealer seems to be steering you correctly toward the high thrust Yamaha 60 with the larger 2.33 gearcase.

The "final drive" of the higher gear ratio of the high thrust foot can be made nearly equal to the lower gear ratio of the standard foot by choosing the correct propeller pitch. The amount of speed you will lose going with the larger gearcase will go unnoticed most of the time because it will be rare that you operate the motor at full throttle for any extended periods.

Since the Merc and Yamaha engines are substantially identical, I recommend that you go with the engine brand that has the better service standing behind it in your locality.

pgbj posted 09-09-2004 02:56 AM ET (US)     Profile for pgbj  Send Email to pgbj     
Thanks for all the help. Sounds like the Merc and Yamaha are pretty much the same and there is probably sound reasons for the 'high thrust' recommendations. If I look around the moorings near me there are Yamahas everywhere and I know there is an authorised dealer/service centre locally. If there's not too much in the price, I'd prefer the Yamaha.
pgbj posted 09-09-2004 02:56 AM ET (US)     Profile for pgbj  Send Email to pgbj     
Thanks for all the help. Sounds like the Merc and Yamaha are pretty much the same and there is probably sound reasons for the 'high thrust' recommendations. If I look around the moorings near me there are Yamahas everywhere and I know there is an authorised dealer/service centre locally. If there's not too much in the price, I'd prefer the Yamaha.
LHG posted 09-09-2004 11:50 AM ET (US)     Profile for LHG    
Does your Boston Whaler selling dealer over there service Mercury? If so, that would make the most sense to me. Also, the BW factory will do a better job rigging the boat/engine than any dealership could. Over the last 35 years, I've sure seens tons of poor dealership rigging work. Some of it never ceases to amaze me! Go with the factory work and you'll be way ahead, and have it done right.
pgbj posted 09-09-2004 04:14 PM ET (US)     Profile for pgbj  Send Email to pgbj     
No the dealer doesn't service Mercury - they are the sole distributor of BW in the UK and are actually some way away from me (not in US terms but in the UK anything over 100 milts is a long way given the traffic!) I think I have found a Merc service centre close to me so maybe this will be the best option - given that the Yamaha is a Merc anyway.
George McR posted 09-09-2004 04:26 PM ET (US)     Profile for George McR  Send Email to George McR     
I have the Mercury on my 150 Sport (2003) in the UK, no regrets with that motor and would agree that the factory fit is the safest way to go.
chopbuster posted 09-14-2004 12:30 PM ET (US)     Profile for chopbuster  Send Email to chopbuster     
I would guess that in order to move/sell more "Bigfoots" (perhaps sales to pontoon Mfg's are lagging behind) Brunswick/SeaRay/BW elected to install them on the 150's.

jimh posted 09-21-2004 11:33 PM ET (US)     Profile for jimh  Send Email to jimh     
Apparently what chopbuster alleges is that the Boston Whaler company has intentionally rigged and sold the wrong engine on their SPORT 150 model for the sole purpose of saving the Brunswick corporation and their Mercury engine division from the losses associated with poor product planning and production allocation for the past several years. Did I get that right?
Alex K posted 09-22-2004 06:02 AM ET (US)     Profile for Alex K  Send Email to Alex K     
why did the Brunswick corporation rate the 170 Montauk down to 90HP??? This decision was obviously forced by the fact that Mercury did not have a 100 HP in their range and not by the consideration what the new heavier and larger hull could actually take. So Whaler performance does have to stand back behind corporate thinking.
poker13 posted 09-22-2004 12:08 PM ET (US)     Profile for poker13    
Well, they could have rated it up to 115 h.p.
jimh posted 09-22-2004 05:40 PM ET (US)     Profile for jimh  Send Email to jimh     
What I find quite amazing is the notion that people will accept without question the suggestion that the Boston Whaler company will intentionally sell you the wrong motor for their boat. I have trouble believing that they are just corporate dupes and take marching orders from some vice-president at Brunswick who tells them what engine to sell.

When people just reach into their bag of tricks and throw stuff like this out, doesn't anybody wonder if they have even a shred of evidence to back up something like this?

If you want to accuse Boston Whaler of intentionally marketing the wrong motor on one of their boats, gosh, maybe you could at least try the boat with a different motor and tell us how much better it works?

Let's look at this with some sense. One guy says he "guesses" the reason they use a particular motor is that their corporate parent had too many of them in stock.

Why is that a more reasonable answer than saying you "guess" they use that motor because it works better than another one?

LHG posted 09-22-2004 06:52 PM ET (US)     Profile for LHG    
It's just a method learned from Dan Rather/CBS.
jimh posted 09-22-2004 08:37 PM ET (US)     Profile for jimh  Send Email to jimh     
LOL--That is exactly right.
poker13 posted 09-23-2004 10:44 AM ET (US)     Profile for poker13    
Well, since you're happily trolling, I'll take the bait this morning. Fox News learned the method pretty well too--for their evil purposes.
Goosedog posted 09-23-2004 01:46 PM ET (US)     Profile for Goosedog    
Mr. McKee should have a conversation with Dan Rather.

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