I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.
Also is this a motor that will work with a Zodiak?


Any help appreciated

Thanks

ganzrott wrote:
I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.
Also is this a motor that will work with a Zodiak?


Any help appreciated

Thanks

Can't help you much with the serial number, although I'd guess 25SD
might mean it's a 25HP engine with a single draft carb, 6L.....(this
probably is not a six cylinder)..who knows,
2S might mean two stroke and 104775 would mean it was the 104th engine
built in the month of July 1975 *if* it was the serial number of a boat
and not the serial number of an outboard......

But your other question:

How much motor is the Zodiac rated for? It should say on the transom
plate. (Good avice, eh, "go and consult the Zodiac for a sign") 25
horsepower seems like a lot of motor for one of the little 8-9 footers,
but there are "Zodiacs" out there that could handle a motor several
times larger.

"ganzrott" wrote
I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.

25SD shows up as a 1990 model number he
http://www.boats.net/yamaha/partsyst...990&model=25SD

and he
https://support.yamaha-dealers.com/s...l=3&nyear=1990

Excellent, thanks for the help.

Ganz




Ernest Scribbler wrote:
"ganzrott" wrote
I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.

25SD shows up as a 1990 model number he
http://www.boats.net/yamaha/partsyst...990&model=25SD

and he
https://support.yamaha-dealers.com/s...l=3&nyear=1990

Thanks for the reply. The Zodiac is rated for a 40 horse, although I'm
told tha that is a lot of motor for a 13 foot Zodie.

My question had more to do with the length of the shaft of the motor
and water depth espically if I were to replace the lower end with a
pump drive.

Ganz


Chuck Gould wrote:
ganzrott wrote:
I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.
Also is this a motor that will work with a Zodiak?


Any help appreciated

Thanks

Can't help you much with the serial number, although I'd guess 25SD
might mean it's a 25HP engine with a single draft carb, 6L.....(this
probably is not a six cylinder)..who knows,
2S might mean two stroke and 104775 would mean it was the 104th engine
built in the month of July 1975 *if* it was the serial number of a boat
and not the serial number of an outboard......

But your other question:

How much motor is the Zodiac rated for? It should say on the transom
plate. (Good avice, eh, "go and consult the Zodiac for a sign") 25
horsepower seems like a lot of motor for one of the little 8-9 footers,
but there are "Zodiacs" out there that could handle a motor several
times larger.

"ganzrott" wrote in message
oups.com...
Thanks for the reply. The Zodiac is rated for a 40 horse, although I'm
told tha that is a lot of motor for a 13 foot Zodie.

My question had more to do with the length of the shaft of the motor
and water depth espically if I were to replace the lower end with a
pump drive.

Ganz


Chuck Gould wrote:
ganzrott wrote:
I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.
Also is this a motor that will work with a Zodiak?


Any help appreciated

Thanks

Can't help you much with the serial number, although I'd guess 25SD
might mean it's a 25HP engine with a single draft carb, 6L.....(this
probably is not a six cylinder)..who knows,
2S might mean two stroke and 104775 would mean it was the 104th engine
built in the month of July 1975 *if* it was the serial number of a boat
and not the serial number of an outboard......

But your other question:

How much motor is the Zodiac rated for? It should say on the transom
plate. (Good avice, eh, "go and consult the Zodiac for a sign") 25
horsepower seems like a lot of motor for one of the little 8-9 footers,
but there are "Zodiacs" out there that could handle a motor several
times larger.


I think shaft length does not matter when swapping with a jet leg. I think
it just splits at the top of the leg. Check with Specialty Manufacturing of
San Leandro, CA., as they make all the pumps.

As for pumps you might check www.ifish.net forumns and
www.riverjetmagazine.com forsale forums.

ganzrott wrote:
I have a 25 horse O/B manufacture Yamaha. The numbers that I can read
on the side a 25SD, 6L2 S, 104775.

I am interested to see what year this motor is so I can get a manual.
Also is this a motor that will work with a Zodiak?


Any help appreciated

Thanks

Ok, now you have me thinking of yet another gadget to spend my bonus on.
We have a Carolina skiff j16, with a 4-stroke 25-hp 'hi-thrust', Yamaha
short-shaft, with a 3-blade aluminum prop. We use it for the skinny
water fishing days. It ain't fast, but runs about 22 mph with two people
aboard. Without the wife, I got to around 24+, but don't ever tell her I
had referred to her as ballast.

Curious to know more about the jet drives, given most of the waters we
go to are very shallow, I am thinking this might make us more
environmentally friendly to the grass flats.

Would a jet drive help to increase speed at all? Or simply provide an
alternative to a prop?

I plan to look around, but I figure this group is a good one to go to
when looking for opinions. Experiences, too!

Happy New Boating Year to all!

DownTime wrote:
Ok, now you have me thinking of yet another gadget to spend my bonus on.
We have a Carolina skiff j16, with a 4-stroke 25-hp 'hi-thrust', Yamaha
short-shaft, with a 3-blade aluminum prop. We use it for the skinny
water fishing days. It ain't fast, but runs about 22 mph with two people
aboard. Without the wife, I got to around 24+, but don't ever tell her I
had referred to her as ballast.

Curious to know more about the jet drives, given most of the waters we
go to are very shallow, I am thinking this might make us more
environmentally friendly to the grass flats.

Would a jet drive help to increase speed at all? Or simply provide an
alternative to a prop?

An outboard jet drive is less efficient than a prop by
perhaps 20% or more and you really don't want to run one in
weedy water. For reference I had a 16' aluminum
flat-bottomed sled that came with an 85 hp 2-stroke and
jet-pump. I eventually replaced the 85 with a 115 hp.

-rick-