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Author Topic:   Nantucket Repower
Sal A posted 11-20-2004 05:51 PM ET (US)   Profile for Sal A   Send Email to Sal A  
Howdy all. I am extremely fortunate in that some clouds I saw on the horizon a few months back have passed over me, and I do not have to sell my boat. As a matter of fact I am back to where I was, which was looking at repowering. (I actually briefly toyed with trading in for a bigger boat, as the repowering is kind of expensive, but my wife saw though that).

I have decided on a 2005 Yamaha F150, and Pete at Lanoka Harbor, should he accept his mission, is the man to do the job. This shouldn't be completed until early March, and I think it will really make the boat more enjoyable for me next season.

It is a heavy motor, and am also considering trim tabs. I'll let you know how it turns out. If any of you know someone who wants to buy my (2004 Mercury 115hp 4 stroke efi 30 hours 25" shaft stainless steel prop) exisiting engine, send them in please.


kamie posted 11-20-2004 11:15 PM ET (US)     Profile for kamie  Send Email to kamie     

That is good news. I would hold on the tabs until you get a feel with the new engine.

Moe posted 11-20-2004 11:33 PM ET (US)     Profile for Moe  Send Email to Moe     
Good to hear you're in better shape than you thoguht, Sal. Personally, I always thought the 205 Eastport was the better boat for you... except that you want a four-stroke.

I think the Yamaha F150 would be a good motor for the 190 Nantucket. Advertise your 115 on THT, but don't expect to get much for it, especially if the buyer has to put a 20" leg on it.


erik selis posted 11-21-2004 01:38 AM ET (US)     Profile for erik selis  Send Email to erik selis     
Hey, that's great news Sal!

I agree with Kamie about waiting a bit for the trim tabs although I'm pretty sure they will benefit the ride when it gets rough and let you get on plane at slower speeds.

Too bad I live so far away or I would be the first to get my hands on that 115 4-stroke EFI Merc of yours for my 170 Montauk. The best Mercury engine for this boat. I'm sure there must be 170 owners out there who would love to have this engine...

The Yamaha F150 should be great for your boat. I hope you get the opportunity to take some pictures of the re-powering process. Always nice to know where some snags could be with re-powering to a different brand.


Sal A posted 11-21-2004 07:19 AM ET (US)     Profile for Sal A  Send Email to Sal A     
Thanks guy. I will list it about a month before the deed will be done... I figure about late December.

Moe... did you ever get your pocket rocket MacGregor?

Riverwhaler posted 11-21-2004 08:55 AM ET (US)     Profile for Riverwhaler  Send Email to Riverwhaler     
Thats good news for you Sal. I was in the same situation, tried Nantucket with 115 but had dealer take it off. He is a Honda dealer as well so it made it easier to get a Honda 150. What a difference that made. You will be very pleased.
The worst thing for a boat is underpowering. It just doesn't feel right in a tight turn and you want to power on out and you have to wait. One wants throttle response when you want to power in and around big waves. Take a ride out of Portsmouth NH against the tide and response is whats needed. We need to keep trank of power to weight ratios when considering next boats.....
highanddry posted 11-21-2004 09:54 AM ET (US)     Profile for highanddry  Send Email to highanddry     
Given the limited use of my boat thus far I am happy with the 150 Opti however it really needs the 175. If I were repowering it would be a 175 horse something or other. Probably an Opti but the new Verados are coming. Given the weight of the Yamaha you are considering the Verado is likely no heavier but we don't really know yet I guess. I think a 175 Opti, same cubes and weight as the 150 would be the ticket for getting a solid 50 MPH top end and still have an economical and effortless cruise. J
Sal A posted 11-21-2004 10:04 AM ET (US)     Profile for Sal A  Send Email to Sal A     

Given that my top speed now is 37mph at WOT under ideal conditions, I'd be happy to get 44mph, and cruise at 33mph at a reasonably low rpm. I do hear that the smaller Verados are coming early 2005, and that they may be a great option for many to consider. I am sure the 190 hull could take even a 200; it is solid.

My guess is that BW knew many consumers wanted a 4 stroke option, but didn't have an appropriate one in their arsenal, and thus offered what they had. They don't even offer the 115 4 stroke as an option anymore. I am sure the feedback wasn't glowing. But the fault is mine here. I should have known better.

Peter posted 11-21-2004 10:47 AM ET (US)     Profile for Peter  Send Email to Peter     
Assuming Whaler's performance report of 44 MPH for a 190 Nantucket with a 150 Optimax is accurate, then putting a 175 Optimax on its transom will yield 46 MPH under the same conditions, not 50 MPH.

The unofficial word is that the Yamaha F150 is good for about 160 HP at the prop. As the hull constant for the 190 Nantucket is about 200 by my calculations with Whaler's data, the F150 should produce a WOT speed of about 45 MPH. With a 17 inch pitch propeller, 2/3 to 3/4 throttle (4000 and 4500 RPM) should yield a speed in the low 30 MPH range.

jimh posted 11-21-2004 11:44 AM ET (US)     Profile for jimh  Send Email to jimh     
The Yamaha F-150 engine is a great choice. They basically OWN the four-stroke market at 150-HP, but there is room for Honda, too.

Both Yamaha and Honda have great new four-strokes at 150-HP. They both have gone to an in-line four cylinder block. Most of the older engines at 150-HP were V-6 engines, but with a four-stroke, it does not look like you can manage a V-6 and keep the weight reasonable. Even with the I-4 engine, the weight is considerable, more than a V-6 225-HP two-stroke used to weigh! But when you compare it to the four-stroke V-6 engines, these new 150-HP I-4 models are at least one hundred pounds lighter.

The Honda is also a great choice, but they don't the wide distribution that Yamaha does.

A quick comparison:

Displacement: 2.67 liter
Weight: 475 pounds
Induction: Multi Port Fuel Injected

Displacement: 2.35 liter
Weight: 485 pounds
Induction: Multi Port Fuel Injected
Valve Timing: V-TEC variable

Both Yamaha and Honda have been making four-stroke engines with fantastic reliability. Now they have the weight of these 150-HP engines into a decent range. They're a great choice for re-powering the Nantucket.

Because you've got conventional shift and throttle controls, you may be able to re-use the Mercury controls you already have. If your rigger is good, he might also be able to adapt some of the other gauges, too. If you go with the Yamaha, get their multi-function Tachometer gauge. They are really nice.

Multi-function Tachometer:

More gauges:

highanddry posted 11-21-2004 06:23 PM ET (US)     Profile for highanddry  Send Email to highanddry     
Peter, regardless of what Whaler says, now that I have had my boat out a few times before the long cold winter and given that it is not broken in and that I was light, my speedo and my GPS are indicating in the range of 46 to 47 after 10 seconds at wide opent throttle--not 44. So, I still say, that with a 175 a useful addition of speed and ski towing power could be gained with NO additional weight penelty. Tell me this, is Sal's 37 MPH with a 115 what Whaler says? Maybe it is. Top speed is not so big a deal anyways, I am trying to think that mid range cruising would be more effortless and pulling skiers would benefit and possibly be able to go up in prop pitch also. J
Peter posted 11-21-2004 07:17 PM ET (US)     Profile for Peter  Send Email to Peter     
Yes, Whaler's performance report with a 115 4-stroke says 37 MPH, right in line with what Sal's reporting. See for yourself at . Even with a light load and the speed you are reporting, I believe the Nantucket would be on the short side of 50 MPH with a 175.

Actually, stuck with the limited engine choices Whaler makes available for the Nantucket, I think the best "bang for the buck" is the 135 Optimax. From about 3500 RPM and up, the performance is almost identical with the 150.

highanddry posted 11-21-2004 10:03 PM ET (US)     Profile for highanddry  Send Email to highanddry     
Be that as it may, the 135 has a different gear ratio so it must turn faster at the crank for a given prop RPM than the 150. The 175 has the same gear ratio as the 150 but the extra power/torque might allow a slightly more aggressive propeller which might result in improved cruise speeds and efficiency. Since they did not test this engine we cannot say until somone puts at 175 on a 'tucket. I think the 175 could produce 30 MPH cruise speeds at a lower RPM than either the 150 or certainly the 135 thus increasing longevity, and possibly economy and improved performance for water sports. There is a thread somewhere here about what people do with Whalers, well, some people do not use them for fishing entirely. Water ski boats need power to hold a constant speed, pull a barefooter etc. The 150 is marginal. Really, it needs a 200 to be frank. It really isn't about the top speed, it is more having the punch to get up and get going. Anyways, glad to see Sal did not have to sell his boat and that the sun once again shines on him. This coming summer I will get some solid speed and acceleration readings just for the heck of it. Good luck. J
nydealer posted 11-21-2004 10:04 PM ET (US)     Profile for nydealer  Send Email to nydealer     
Highanddry in our experience with opti's they run faster in cold weather. If the temp is droping your speed may be going up. It is unlikely that whaler will be testing boats at The temps we have in NY right now. I don't think a standard 115 2 stroke will have the same difference.
Perry posted 11-22-2004 12:34 AM ET (US)     Profile for Perry  Send Email to Perry     
highanddry, the 135 Optimax provides pretty good get up and go on the 190. According to Boston Whaler's performance data, the 135 Optimax gets the Nantucket to plane in just 3.7 seconds. Just .2 seconds slower than the 150 Optimax. 3.7 seconds is fairly quick. How fast do you want to get to plane, 2 seconds?
TexasWhaler posted 11-22-2004 10:31 AM ET (US)     Profile for TexasWhaler  Send Email to TexasWhaler     
We need to get one of those big Yamaha V-Max motors from a couple of years ago that have the dual counter-rotating props on the back of a Nantucket.

Talk about hole shot!

highanddry posted 11-22-2004 01:50 PM ET (US)     Profile for highanddry  Send Email to highanddry     
Perry, I am not all that impressed with Whalers performance data since they don't realize the boat they make should be rated 135-200 and not 115-150!
A test in Trailer Boat stated the 'tucket was only so so getting up on plane. I agree. The faster the better for getting a slalom skier up on a performance type ski or pulling a barefooter up from a wet start. For hauling my dive gear a bit more power would not hurt either but I am poitive the 150 Opti will be OK--not great---OK!
I also asked in another thread if anyone had opened up the vent plugs on their 'tucket with Opti power. No one has. It seems to me that despite Whaler's all powerful and ultimately conclusive blurb on performance with like all of three engines and only a handfull of props with no mention of venting etc that there is still MUCH to learn about optimal rigging of a Nantucket with various engines. In other words, I really am not caring what Whaler says since they apparently have done little testing other than sticking an out of the box engine on the boat, lightly loaded and motored around a bit--it least it looks that way to me, could be wrong. J
Riverwhaler posted 11-22-2004 06:48 PM ET (US)     Profile for Riverwhaler  Send Email to Riverwhaler     
I agree, BW data on Nantucket is not what I got when I had 115 on boat. It took longer than stated to get up on.
I will be happy to take anyone for ride here in So Vermont to see 150 has plenty of go.
Perry posted 11-22-2004 10:43 PM ET (US)     Profile for Perry  Send Email to Perry     
Riverwhaler, I'm looking into the possibly buying a new Nantucket and I curious how yours performs with the BF150 on it. If I wasn't so far away from you, I'd take you up on your offer for a ride. How quick does it get on plane and do you know the top speed?
Yiddil posted 11-23-2004 11:29 AM ET (US)     Profile for Yiddil  Send Email to Yiddil     
Sal, Glad to hear things have settled for you and your not going to have to saell that Nantucket!! Youl be glad you kept her. Repower...thats great...keeping her...thats better....You know Ive been estatic with my Nantucket with the 115-2...Not needing more speed, 37 is fine for me:)
But I'd wait on the tabs until you get a feel for the Kamie said...I did purchase a SS prop..18 pitch that I will put on in the spring....We winterized last weekend....Im soooo Lonely fo "Das Boat"Had a ball learning how to do the engine and live back hurts still, but we had a good time doing it. My Boat log shows I was out 75 times from May 15th-to Mov. 20 hehe

Very happy your back:) Henry AKA THE YIDDIL

Sal A posted 11-23-2004 12:21 PM ET (US)     Profile for Sal A  Send Email to Sal A     
Thanking you Henry! Good to be back.
Riverwhaler posted 11-23-2004 05:09 PM ET (US)     Profile for Riverwhaler  Send Email to Riverwhaler     
Perry I will try to get on river day after Thanksgiving and will give you a report on getting on plane. Last week on calm water, wife and I aboard was doing 45 easily. Honda is really a nice engine. Hadn't run it for a couple of weeks and temp was 50, started immediately.
Riverwhaler posted 11-27-2004 12:59 PM ET (US)     Profile for Riverwhaler  Send Email to Riverwhaler     
Just got back from CT River. Real cold 38 deg. With 2 adults 170 each and 2 kids 4 and 5 yrs old up on plane 3 seconds about 20 mph by GPS. Really snaps to it.

Last run of year.

Perry posted 11-28-2004 01:47 AM ET (US)     Profile for Perry  Send Email to Perry     
Sounds like the BF150 is a nice match for the Nantucket. Thanks for the report and I hope spring comes quick for you.
jimh posted 11-30-2004 09:07 AM ET (US)     Profile for jimh  Send Email to jimh     
POWERBOAT REPORTS compared the BF-150 Honda and the F-150 Yamaha engines in a recent 2004 issue of their magazine. Their assessment was the Honda was the winner due to better mid-range fuel economy. Otherwise the engines were very similar.
LHG posted 12-01-2004 05:17 PM ET (US)     Profile for LHG    
I've just had a chance to see a whole bunch of Mercury in-line 6 Verados up close, and on the water, and the current crop of Japanese 4-strokes look obsolete & clunky next next to these things, believe me. Like one would expect from an in-line 6, they are large in side profile, but small in rear profile, and overall, dynamite in appearance, particularly in twin configuration. Sales must be fantastic, as I have already seen a lot of them on the water, and in showrooms, all over SE FL, both new boats and re-powers. Even saw a Grady repowered with a pair of them!

Based on this engine, I would think the in-line 4 soon to appear, 135, 150 and 175 HP, would be WELL worth waiting for, a potential huge seller.

Verados have become the new MUST HAVE engine for upscale boaters. I have a photo of a brand new CONTENDER, which is basically a Yamaha-tied company, docked in Palm Beach, sporting triple 275 Verados! They also seem to be very popular with the Genmar owned Wellcraft company.

As a person considering such a repower, I have determined the re-rigging cost is not a large expense at all. The helm pump is Mercury specific, evidently, and has to be purchased. But the old Teleflex helm pump could easily be sold on this site for half of it's original cost. The hoses are interchangeable between systems. The DTS engine control also needs to be bought, but the old engine control also has re-sale value. And the compact new DTS control is in a league by iteself, all chrome and truly beautiful. So the cost is not all that much. At the engine, there is NO Front mount cylinder to be installed. The transom mount on these Verados, with small integral steering cylinder, is the best looking, cleanest, detail you have ever seen in outboarding.

Sal A posted 12-20-2004 04:00 PM ET (US)     Profile for Sal A  Send Email to Sal A     
The Yamaha F150 is now on the back. Guages to go in later this week. I'll snap some pictures when I go down to the marina on Thursday, and try to make them detailed, especially regarding to any special rigging issues. I'll try to put together some pics and narative and send them to our gracious host and moderator; maybe I'll be immortalized in Cetacea!

Anyways I'll post pics and keep the forum informed.

Sal A posted 12-20-2004 04:02 PM ET (US)     Profile for Sal A  Send Email to Sal A     
PS I chose analog guages (tach, fuel, voltmeter, waterpressure, hour meter)
rtk posted 12-20-2004 09:33 PM ET (US)     Profile for rtk  Send Email to rtk     
Good luck with it Sal. Nothing like a shiny new motor for the holidays!


erik selis posted 12-21-2004 03:40 AM ET (US)     Profile for erik selis  Send Email to erik selis     
Yeah, good luck Sal! Talk about getting a nice Christmas gift. :-)

Looking forward to seeing those pictures.


Sal A posted 01-03-2005 06:45 PM ET (US)     Profile for Sal A  Send Email to Sal A     
Here are some pictures of my repower in progress. I am using photobucket. There are a few pictures of a 210 Outrage with a new Verado on the back as well thrown in.

Joe Kriz posted 01-03-2005 07:07 PM ET (US)     Profile for Joe Kriz  Send Email to Joe Kriz     

It says your Account is PRIVATE....

Lots of advertisements on those Photo Bucket pages heh?

Sal A posted 01-03-2005 07:36 PM ET (US)     Profile for Sal A  Send Email to Sal A     
Hey Joe,

Yeah.... I suppose I should search around for a better solution. I have a cable ISP, so I will get aroud to figure out how to use it to upload pictures there instead. Sorry about the ads. Anyways I got in to photobucket and updated it to public.

I took lots of pictures of the new F150 with the cowling off, although I suppose it just made me feel more technical doing so; I wouldn't want to admit that I was more happy that the grey motor matches the grey shadowing on my boats's name , Mary Alice :-).

Hope the album is viewable now.

erik selis posted 01-04-2005 05:20 AM ET (US)     Profile for erik selis  Send Email to erik selis     
Hey Sal,

Thanks for posting those pictures. The F150 looks great on the transom of your fine boat. I'm sure you'll be pleased with it's performance as well. Keep us posted and good luck!


Sal A posted 01-04-2005 07:45 PM ET (US)     Profile for Sal A  Send Email to Sal A     
Testing my ISP:

Sal A posted 01-04-2005 07:49 PM ET (US)     Profile for Sal A  Send Email to Sal A     
One more time with apologies:

captreils posted 01-04-2005 09:06 PM ET (US)     Profile for captreils  Send Email to captreils     
I test drove Sal's boat today after installing the new motor. I started off with a 13 3/4 x 17 ss yamaha prop. Top speed was 46 mph with the engine bouncing off the rev limiter. Next up was a 14 x 19 Merc vengance ss prop. Top speed increased to 50.5 mph at 5800 rpm's. The motor pulls strong throughout the entire rpm range. It holds a plane as slow as 12 mph. I think this motor is an excellent choice for this boat, especially considering what came off it. All the analog gauges and controls fit perfectly where the old rigging came out from, you could never tell that the boat had a Merc on it.
note. all speed readings came directly from Sal's fixed mount gps reading miles per hour. Top speed readings were taken only after the first hour of running the boat and just long enough to get the reading.
Sal A posted 01-05-2005 08:16 AM ET (US)     Profile for Sal A  Send Email to Sal A     
Now thats what I'm talkin about Mr D.
TG_190 posted 01-10-2005 04:06 PM ET (US)     Profile for TG_190  Send Email to TG_190     

Congrats on the re-power. That sounds ideal. I also heard the F150 was about 163hp at the prop. I have heard nothing but great things about that engine.

I wouldn't wait to put tabs on it. Trust me, when you finally get them you'll regret not having done it sooner. It will be the 2nd best thing you'll do to it.

I just listed my 2003 Nantucket on boattrader. If it doesn't sell in 4 weeks, it goes to a broker that will definately sell it.

I will take you up on that fishing in the spring!
(Though I'm still fishing now)


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