Whaler Central - Boston Whaler Boat Information and Photos

Posted by patrickgmiller on 07/21/11 - 2:07 PM

Seems like a wealth of information on the site, but having trouble finding info on the Yamaha F70LA and how it could do pulling a skier on a classic Montauk.

I have a 1986 Montauk and am debating between a Yamaha F70LA and a F90TLR. Mostly using the boat for cruising around and running around the Chesapeake, but would like to be able to pull a skier. Do you think the 70 would have enough power to pull a sub 170lb skier?

Thanks

Posted by Joe Kriz on 07/21/11 - 2:35 PM

We have an article on "Current Engine Choices and Weights".
http://www.whalercentral.com/articles...ticle_id=5

The 2 best choices for HP to Weight:
1. E-Tec 90 @ 320 lbs
2. Yamaha F70 @ 260 lbs

Another place to see what motors members have is in the personal page section. Scroll down to the 16/17 models.
http://www.whalercentral.com/viewpage...page_id=65

I used to ski behind my 1978 Montauk with an Evinrude 70 hp 2 stroke.
Don't know about a 4 stroke...

Posted by msd58 on 07/22/11 - 10:12 AM

70 will be fine but 90 will be better. I have a 90 Yamaha on mine moved from 70 Evinrude. Same weight back on the transom but 20 more HP. Even uses the bolt holes left by the 70

Posted by highstepper on 07/26/11 - 8:05 PM

I think the 70 would be a bit anemic if trying to get an adult slalom skier up. I Just repowered my 1984 Montauk with the F90A Suzuki- it is a very good match for the boat. 341 lbs, 2.58:1 lower unit, and a peak rpm of 6300. I completed the 10 hr break in on less than 10 gallons of gas. I was bumping the rev limiter with a 14 x 18 prop and a moderate load, switched to a 14 x 20. This thing gets out of the hole like a 2 stroke, and easily tops 40 mph. Most importantly, at 3500 - 4000 rpm it gets excellent fuel economy. A very good match for the Montauk.

Posted by Joe Kriz on 07/26/11 - 8:12 PM

highstepper,

Suzuki has the DF90 and the Yamaha has the F90.....

What model is the Suzuki F90A ?

EDIT:
I just found it.... It is the DF90A...... a new model series for this year.

Edited by Joe Kriz on 07/26/11 - 8:13 PM

Posted by highstepper on 07/27/11 - 10:47 AM

Joe: I believe it came out in 2009. The new Suzuki 90 is about 70 lbs. lighter than the previous version (410 vs. 341), and thus far has a good track record for reliability according to a Suzuki tech that I trust.
By the way, wonderful site.

Posted by brinkleyp on 10/08/11 - 1:46 PM

Patrick-
Not sure if you have already repowered, but my F70 Yamaha on my 1973 17' hull has no problem pulling me up on one ski & I'm 180# & usually have my wife & 3 kids in the boat.