Sport 13 Sport, Yamaha F40 - Moderated Discussion Areas

  ContinuousWave
  Whaler
  Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  Sport 13 Sport, Yamaha F40

search | FAQ | profile | register | author help

Author Topic:   Sport 13 Sport, Yamaha F40

zotcha posted 09-11-2013 11:09 AM ET (US)
A friend with a c.1975 Sport 13 has removed a 25-HP two-stroke-cycle outboard engine and replaced it with a [new Yamaha] 40-HP four-stroke-cycle engine. He is not pleased with his decision. His main concern is that he cannot get the foot [gear case] out of the water while secured to his dock. He never needs a second six-gallon tank aboard.
So [provide a remedy with use of a] fixed jack plate? Or, fill forward storage with sand for ballast? I do not know at what hole the motor is mounted. Do not know weight of new outboard. Do not know transom height, but assume a 15-inch. I believe this hull is pre-smirk. Will collect more information. Looking for real world experience and possible solutions. Thank you.
zot.
jimh posted 09-11-2013 11:43 AM ET (US)
Do you mean to say the problem is the new engine does not clear the water when tilted up?
zotcha posted 09-11-2013 11:45 AM ET (US)
Yes. That would be his chief complaint, I believe. Thanks Jim.
jimh posted 09-11-2013 11:59 AM ET (US)
If the new Yamaha F40 is a 20-inch shaft and the transom of the c.1975 Boston Whaler is made for a 15-inch shaft, your friend has more problems than just the tilt-up position not getting the skeg out of the water.
The transom height on the SPORT 13 changed to 20-inches in c.1972.
If the problem is only when at rest and tied to the dock, perhaps a suitable weight could be kept at the dock. The weight could be brought onboard the boat when the operation of the boat was done. The weight would be put in the bow locker, and the static trim changed enough to get the skeg clear of the water. The weight could be removed while operating the boat, and left on the dock.
goldstem posted 09-11-2013 12:14 PM ET (US)
the problem, I believe, is that the F40 was a poor choice for that hull. the old 25 weighed about 120 pounds, the F40 220.
that is a big difference off the back of that hull. In my opinion the max for that hull is about 180.
that being said, he can move the battery up under the steering console, and the gas tank up under the helm seat (if he raises it, which makes it more comfortable as well). that should shift enough weight forward to compensate.
zotcha posted 09-11-2013 12:45 PM ET (US)
OK, so it is more than likely a twenty inch transom. Should have realized that. That is a good idea of weight at the dock. And yes, possibly a poor choice of power for the hull. I'm thinking manual jack plate, but I am biased. Thanks. zot.
Captronnied posted 09-19-2013 04:46 PM ET (US)
Theres a JACK PLATE called "minijacker". It works perfectly for mounting a 20" shaft on a classic whaler that was meant for a 15".
Nevek posted 09-25-2013 11:35 AM ET (US)
Where is the gas tank and battery located? Can they be moved to under the front thwart?
funhog posted 10-01-2013 11:45 PM ET (US)
I have a 1982 Sport 13; I added a stand-up center console. I went to a 1989 Johnson 48-SPL from an 1980 Johnson 35. The engine weighs 195-lbs, and it is mounted [two-holes up]. The prop is an 11.5 x 19. Due to the transoms curve and cant, the engine shaft sits quite a ways back from hull when in the vertical (or running) position. I rased the engine to [two-holes up] and got the best performance with the top of the [anti-ventilation] plate just barely showing when trimmed out on plane at a reasonable speed. The [two-holes up] may give the the engine [the] water clearance you're looking for (and better performance).

Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.

Author	Topic: Sport 13 Sport, Yamaha F40
zotcha	posted 09-11-2013 11:09 AM ET (US) A friend with a c.1975 Sport 13 has removed a 25-HP two-stroke-cycle outboard engine and replaced it with a [new Yamaha] 40-HP four-stroke-cycle engine. He is not pleased with his decision. His main concern is that he cannot get the foot [gear case] out of the water while secured to his dock. He never needs a second six-gallon tank aboard. So [provide a remedy with use of a] fixed jack plate? Or, fill forward storage with sand for ballast? I do not know at what hole the motor is mounted. Do not know weight of new outboard. Do not know transom height, but assume a 15-inch. I believe this hull is pre-smirk. Will collect more information. Looking for real world experience and possible solutions. Thank you. zot.
jimh	posted 09-11-2013 11:43 AM ET (US) Do you mean to say the problem is the new engine does not clear the water when tilted up?
zotcha	posted 09-11-2013 11:45 AM ET (US) Yes. That would be his chief complaint, I believe. Thanks Jim.
jimh	posted 09-11-2013 11:59 AM ET (US) If the new Yamaha F40 is a 20-inch shaft and the transom of the c.1975 Boston Whaler is made for a 15-inch shaft, your friend has more problems than just the tilt-up position not getting the skeg out of the water. The transom height on the SPORT 13 changed to 20-inches in c.1972. If the problem is only when at rest and tied to the dock, perhaps a suitable weight could be kept at the dock. The weight could be brought onboard the boat when the operation of the boat was done. The weight would be put in the bow locker, and the static trim changed enough to get the skeg clear of the water. The weight could be removed while operating the boat, and left on the dock.
goldstem	posted 09-11-2013 12:14 PM ET (US) the problem, I believe, is that the F40 was a poor choice for that hull. the old 25 weighed about 120 pounds, the F40 220. that is a big difference off the back of that hull. In my opinion the max for that hull is about 180. that being said, he can move the battery up under the steering console, and the gas tank up under the helm seat (if he raises it, which makes it more comfortable as well). that should shift enough weight forward to compensate.
zotcha	posted 09-11-2013 12:45 PM ET (US) OK, so it is more than likely a twenty inch transom. Should have realized that. That is a good idea of weight at the dock. And yes, possibly a poor choice of power for the hull. I'm thinking manual jack plate, but I am biased. Thanks. zot.
Captronnied	posted 09-19-2013 04:46 PM ET (US) Theres a JACK PLATE called "minijacker". It works perfectly for mounting a 20" shaft on a classic whaler that was meant for a 15".
Nevek	posted 09-25-2013 11:35 AM ET (US) Where is the gas tank and battery located? Can they be moved to under the front thwart?
funhog	posted 10-01-2013 11:45 PM ET (US) I have a 1982 Sport 13; I added a stand-up center console. I went to a 1989 Johnson 48-SPL from an 1980 Johnson 35. The engine weighs 195-lbs, and it is mounted [two-holes up]. The prop is an 11.5 x 19. Due to the transoms curve and cant, the engine shaft sits quite a ways back from hull when in the vertical (or running) position. I rased the engine to [two-holes up] and got the best performance with the top of the [anti-ventilation] plate just barely showing when trimmed out on plane at a reasonable speed. The [two-holes up] may give the the engine [the] water clearance you're looking for (and better performance).