Page 1 of 1

Repower 15 ft whaler ?

PostPosted: September 28th, 2016, 5:07 pm
by woody
I'm going to repower my 1986 15 foot Boston whaler any suggestions on what type of motor / hp I should use I don't want under power the boat . the new 4 strokes are heavier then the 2 strokes .I don't want tug boat with my fat ass and my skinny as dive buddies who have belts heavier then thy are lol ???

Re: Repower 15 ft whaler ?

PostPosted: September 29th, 2016, 7:16 am
by chris oak
Woody you definitely want to visit continuouswave.com or whalercentral.com and ask the boston whaler guys. Overpowering a small boat can be dangerous if you are running it full throttle. When you narrow down your 4stroke, do a search on weight (there used to be a huge difference between honda and suzukis but I'm not sure now) and also whatever engine you center on make sure you read up on any trouble spots ie. exhaust manifolds that cause corrosion, ease of service etc. On my yamaha it is very easy to remove the trim motor but on some suzukis you have to remove the whole engine to get to it.

Re: Repower 15 ft whaler ?

PostPosted: September 29th, 2016, 7:22 am
by Bowhunter
I agree with Chris, the new 4 strokes are not much heavier if at all.
I am looking to re - power a family ski boat , and looking at the merc motors, the 115 4 stk is within 20lbs of the 2 stroke .
Oh and they all are producing more than the label says , like 5-10 hp.
Good luck.Chuck
P.s. my boat is a 16' Tahiti and I'm looking at a 115 hp.


Sent from my iPad using Tapatalk Pro

Re: Repower 15 ft whaler ?

PostPosted: September 29th, 2016, 11:58 am
by castronova
A 90 hp Merc or Suzuki would be really nice on that boat. The suzuki's are about 20#'s lighter in the 70 - 90 hp range. Most the 15's I've seen have 60 - 75 hp. I'd think even a 60 would be fine in most cases but probably not weighed down with a few divers, gear, and ice chest.

You see them down here in the keys over powered a lot and people love them. I've seen 19's with 150 Merc 2 strokes. A friend of mine has a 17 with a 115 Merc Pro XS.

Re: Repower 15 ft whaler ?

PostPosted: September 29th, 2016, 2:29 pm
by Nate Baker
You put a 90 on that thing and you'll need to go to flight school. I know a couple of guys who did it and it was scary. I can't think of any reason anyone would need to go 50 mph in a 15 foot boat in the open ocean. Those 15s used to come stock with a 70 if I remember correctly. Agree with Castronova, you'd be fine with a 60, either 2-stroke or 4, it can handle either. For reference, many people used to put 60 hp engines on 17 Whalers which were almost twice the weight.

Re: Repower 15 ft whaler ?

PostPosted: September 30th, 2016, 5:28 am
by castronova
What may be a good choice if for some reason you think you will overload the boat with a 60 hp would be a Merc 60 torque master. They make the torque master in a few hp models, they have lower gearing so you can swing a little bigger prop and have better low end.

Re: Repower 15 ft whaler ?

PostPosted: September 30th, 2016, 5:32 am
by castronova
Sorry, command thrust. Torque master is Yamaha.

Re: Repower 15 ft whaler ?

PostPosted: October 4th, 2016, 10:25 pm
by woody
This new Yamaha F 70 weighs 257 pounds it's the lightest 70 horse in the market my second choice would be the Honda 60 hp midrange it weighs 239

Re: Repower 15 ft whaler ?

PostPosted: May 17th, 2017, 7:57 am
by undrH2Ohntr
I agree with Chris...read up and ask others what they are running (all the boating forums), this really helped me.

I am finishing up a re-power right now, pick it up tomorrow if all goes well.

I'm running a 15' Hobie Skiff. It had the original 1990 70hp 2 stroke Yamaha on it, weighing 229lbs. I looked and compared countless motors and range in hp from 40hp etec's up to 70hp all major brand 4 strokes. There are some major differences in both weights and pricing. The weight differences wouldn't be such a big deal on larger boats but on our smaller skiffs every pound counts.

I ended up going with a 60hp Suzuki 4 stroke that weighs exactly the same as my older 70hp 2 stroke. I can't wait to be smokeless and get even better fuel mileage, I was pulling about 5mpg with the old motor so I'm hoping to squeeze out a few more with the new one.

Good luck.

Re: Repower 15 ft whaler ?

PostPosted: May 17th, 2017, 9:31 am
by dariian
I have a 15ft whaler running a 60 Yamaha and it runs great. If I could repower I might go up a little but there's really no need.

Re: Repower 15 ft whaler ?

PostPosted: July 18th, 2017, 10:03 pm
by db1
Hey Wood, I know this is an old post and I'm not sure if you ever repowered it or if you still have it. But yes, as Nate said, they came standard with a Johnson 70 back in the day. The Montauk 17 was powered with a 90. 90 would be too much for this boat in my opinion. A lot of people run them with 60, but if it were me, I'd want the 70.

When you gonna buy my 19 Outrage? :confusion-shrug: