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  13 FT -84 with a New 50 Yami

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Author Topic:   13 FT -84 with a New 50 Yami
kdsundb posted 02-07-2005 06:23 PM ET (US)   Profile for kdsundb   Send Email to kdsundb  
Anybody set up a 13 sport with a newer 50HP Yami.
Engine weighs in at 189.
It may be a little more than I should - but I would like to get up on one ski behind the thing - and since I am not loosing any weight on my end - figure I would add some on the whalers..
Any horror stories before I commit. I am top bidder on Ebay for a NEW 2002 Yamaha 50 20 inch. PTT.
JBCornwell posted 02-07-2005 08:37 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
The Classic 13 is a dangerous boat with more than 40hp.

Been there. Scared hell out of me.

Red sky at night. . .
JB

FISHNFF posted 02-07-2005 09:37 PM ET (US)     Profile for FISHNFF  Send Email to FISHNFF     
I had a 1981 Sport 13 with a 1989 Yamaha 40. I later had it built up to a 50, with new carb jets, exhaust plate, and reed valves.
Was it much faster? Maybe 2 or 3 MPH. Better under a load. I had it raised to the third hole (two showing) and ran a Yamaha 15" black SS prop. Just broke 40MPH (I think 41.7GPS). Maybe more, as it was slightly faster than a buddies Montauk w/90 Evinrude V-4 in flat water.
Two persons with two batteries, livewell, and 6 gallons of fuel was fast. Too much trim and porpoised. Alone w/o livewell was scary. Trimmed way out and flew!

FISHNFF

kdsundb posted 02-08-2005 08:58 AM ET (US)     Profile for kdsundb  Send Email to kdsundb     
Sounds like I should be focusing in on a newer 40 ...
Can anyone compare a 25 4 stroke Honda to a older 35 Merc?
Besides the obvious - cleaner, quiet ... what about performance?
JustinAndersen posted 02-08-2005 02:27 PM ET (US)     Profile for JustinAndersen  Send Email to JustinAndersen     
Boy... 50 Yammie 2s to an older Merc 35 2s to a Honda 25 4s... I can tell you that unless you have the physique of a jockey you will NOT be able get up on one ski behind either the Merc or the Honda.

In a nutshell, a 2S will provide more performance given a specific horsepower rating than a 4S, at the expense of fuel efficiency, quietness and cleanliness.

I've never been impressed with the old Merc 35. Lots of maintenance, expensive repairs, plenty of vibration and excessive exhaust. The motor will, however, be more powerful than a 25 Honda obviously as it's a 2S and 35 vs. a 25.

That said, a 40 Merc 2S will probably give you the most bang for your buck in terms of waterskiing performance. Whether you can get up on one ski will depend on your size and your prop. Go with a 40 4S if performance isn't the key issue.

Speaking of the Yammie, someone posted some pictures of a beautifully restored 13 with a 50 Johnson on the back. The static trim looked a bit dodgy owing to the weight of the motor. Someone else referred to a 50hp powered 13 as "scary".

Stay with the 40hp. I used to have a 13 with a 40 Merc 2S with T&T. Great boat. Lots of fun. Clocked out at 53MPH (measured on a Standard Horizon handheld GPS) on a calm day.

macfam posted 02-08-2005 05:19 PM ET (US)     Profile for macfam  Send Email to macfam     
JustinAnderson,
C'mon....your're kidding.
53mph...with a 40 2-stroke on a 13'?

I've got a 1987 13' Super Sport w/2000 40hp Johnson with T&T.
15" 3-blade aluminum (nuttin' special)
Hasn't reached 40mph(GPS)ever!
Havn't had the time to try my 17" SS yet...maybe 40mph then.
How the heck can I get to 53mph? Share your secret(s).

FloatingHobo posted 02-08-2005 06:18 PM ET (US)     Profile for FloatingHobo  Send Email to FloatingHobo     
I have to agree with macfam. Fifty-tree seems extraordinary for a 13 with 40 horses. I have 77 13 sport with a 94 Evinrude 40 with T&T. Mine is pretty heavy aft with the battery and two 6 gallon tanks so I've only topped it out at 38 on a calm day. Had to trim way up to do that and she started the chine walk pretty bad at that point. Fifty-tree in a 13 sounds scary as all get out.

Over the LINE posted 02-09-2005 09:12 AM ET (US)     Profile for Over the LINE  Send Email to Over the LINE     
I have the set up you are looking at, down to almost exactly the same years on both motor and hull. I would not lend my rig to a child or the inexperienced (then again I don't lend it anyway). I, however am neither.

For what I do the extra power comes in handy some times. I haul large amounts of junk to and from a duck / fishing camp in the marsh. I go hunting in really skinny water and need to get on an immediate plane with the prop in the mud.

When not hauling junk or dragging the skeg through the mud, I run around 4200 RPM with the motor hardly working and fuel consumption down. I like the set up and don't think I would change.

There have been many discussions about the insurance and other problems with overpowering. You can find them by searching previous posts.

devildog posted 02-09-2005 09:30 AM ET (US)     Profile for devildog  Send Email to devildog     
I did a lot of skiing behind a 13 with 40 hp Merc when I was a kid. I remember being able to tug the boat then. Now as an adult who also isn't losing any weight, I wouldn't even bother trying to ski from a 13. Just my 2 cents.

Jeff

kdsundb posted 02-09-2005 08:15 PM ET (US)     Profile for kdsundb  Send Email to kdsundb     
You are right about pulling - but my fat butt is only behind it once in awhile. The hull is fine for the kids - expecially with the wake board ...you can't cut as hard as with a ski. I have my eye out for a 15 ...but I like to pull the 13 behind an older SeaRay Sedan Bridge. Why did I sell the Nauset!
jimh posted 02-09-2005 08:25 PM ET (US)     Profile for jimh  Send Email to jimh     
[Moved]
2004_130_SPORT posted 02-10-2005 01:56 PM ET (US)     Profile for 2004_130_SPORT  Send Email to 2004_130_SPORT     
Justin,

You are full of crap on the 53mhp. That just doesn't happen i have a 130 sport with a brand new 40hp 2s merc and it tops out at 38 on a perfect day.

The Judge posted 02-10-2005 03:36 PM ET (US)     Profile for The Judge  Send Email to The Judge     
Nothing wrong with a 50 on a 13 but you are pretty much wasting money. That hull was designed to run a 25hp and do it at about 30mph. A 40 will give you 35+ and a 50 might fetch you 40+ if you set it up right. The main differences between all of them is handling loads. With 4 adults, you won't plane out with a 25 or just barely. Then again if you run with 4 adults in a 13, you need a bigger boat:).

If you put a 70 on that boat I doubt it would not do 50, can't make a barge fly.

de posted 02-11-2005 09:02 PM ET (US)     Profile for de  Send Email to de     
I've got a '65 13ftr with a new F50 Johnson. To heavy, and kind of scary at WOT for me. .... she's smooth and quiet though. The main issue for me is the weight ... you can always pull back on the throttle. Maybe I'll take her out tomorrow and see what she'll top out at. It ain't 53 ... but it probably seems like it being that close to the water. I've been on bass boats running 75+ and feel safer than my little 13ftr running in the 30s.

Some pics here ..

http://boston.gotdns.com/whaler

mcollinstn posted 02-15-2005 02:56 AM ET (US)     Profile for mcollinstn  Send Email to mcollinstn     
A 13' sport WILL run over 50.
As any Whaler racer will tell you, though, you gotta knife edge the keel rudders or else they try to climb on top of the water in a scary manner...
BQUICK posted 02-16-2005 05:01 PM ET (US)     Profile for BQUICK  Send Email to BQUICK     
Tell me more about "knife edgeing the keel rudders".

I've got a 71 Sourpuss with a 1970 50 Merc with power trim.

I have to trim the motor WAY out to run 48 mph and it will chine walk.

I was thinking of taking the "hook" out and the knife edging sounds interesting. What are the keel things for anyway? Turning is my guess......

Bruce

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