yamaha 15 vs yamaha 9.9
 

On Sat, 17 Mar 07, sherwindu wrote:
I can't lift the engine into the
cockpit like I used to do with my Silver Century Seagull

Tell me about it. Or it's nice to set it in cabin to lock it up. Plus
the tendency to list, and/or squat the stern, and lift the bow,
instead of adding stability low and amidships where weight needs to be
(I've almost convinced myself to go inboard next time.... but not
quite).

I think Honda putting a
larger prop on it's 'high-thrust', high gear ratio engine is a poor
compromise.

For you and me maybe. But for them, it's a profit maximizing decision
that prolly works pretty well on their bottom line. But at least
they're honest about what it'll do. They're claiming only a 15%
increase in thrust. Sounds about right to me.

The only thing I don't like about
my T9.9 are the tiny jets in the carburetor, which are continually blocking
up.

Honda has the same problem. I spent 30 minutes yesterday cranking and
cussin' at mine. Never did get it started. So it's off to the shop
with it (again). I no longer have the patience. Hopefully I'll get it
back in a few weeks (as opposed to months like last time). Meanwhile
I'll putter along with my ol' ancient standby Evinrude. It ALways
starts, no prob.

I am
actively working on solutions for that

If you come up with one, please post it here.

Rick

yamaha 15 vs yamaha 9.9
 

Actually, repairing a blocked carb on the Yamaha is tiresome, but not that
difficult.
After dissassembly, just run a very fine wire through the jets to open them up.

A more pro-active way would be to buy only premium gasoline. Make sure your
fuel system is clean, hoses, tanks, etc. Use a stabelizer like Sea Foam or
Stabil in
the gas tank. Put a fine filter (about 10 micron) in line with your fuel
delivery system.
I am going to try all the above next season. Now that I hear that Honda's have
the
same problem, I regret even less my decision to go with Yamaha. Honda is
obviously catering to the power boat community.

Sherwin D.

lid wrote:

On Sat, 17 Mar 07, sherwindu wrote:
I can't lift the engine into the
cockpit like I used to do with my Silver Century Seagull

Tell me about it. Or it's nice to set it in cabin to lock it up. Plus
the tendency to list, and/or squat the stern, and lift the bow,
instead of adding stability low and amidships where weight needs to be
(I've almost convinced myself to go inboard next time.... but not
quite).

I think Honda putting a
larger prop on it's 'high-thrust', high gear ratio engine is a poor
compromise.

For you and me maybe. But for them, it's a profit maximizing decision
that prolly works pretty well on their bottom line. But at least
they're honest about what it'll do. They're claiming only a 15%
increase in thrust. Sounds about right to me.

The only thing I don't like about
my T9.9 are the tiny jets in the carburetor, which are continually blocking
up.

Honda has the same problem. I spent 30 minutes yesterday cranking and
cussin' at mine. Never did get it started. So it's off to the shop
with it (again). I no longer have the patience. Hopefully I'll get it
back in a few weeks (as opposed to months like last time). Meanwhile
I'll putter along with my ol' ancient standby Evinrude. It ALways
starts, no prob.

I am
actively working on solutions for that

If you come up with one, please post it here.

Rick

yamaha 15 vs yamaha 9.9
 

On Wed, 21 Mar 07, sherwindu wrote:
Actually, repairing a blocked carb on the Yamaha is tiresome, but not that
difficult.
After dissassembly,

........ (the tiresome part.... as well as reassembly)

just run a very fine wire through the jets to open them up.

That's the "not that difficult" part.

A more pro-active way would be to buy only premium gasoline. Make sure your
fuel system is clean, hoses, tanks, etc. Use a stabelizer like Sea Foam or
Stabil in the gas tank. Put a fine filter (about 10 micron) in line with your fuel
delivery system.

Honda has a screw on the side of the carburetor that, with a half
turn, allows the bowl to drain (thru a tube, out, next to the pee
hole... pretty handy :-). My shop sevice manager says that's the most
important thing I can do to prevent gum up. "Running" the carb dry
won't empty it completely. He mentioned everything else on your list
as well.
I asked if I could have it back in a few days. He shook his head and
said "Maybe a few weeks". Frankly, my money's on "Months", we'll see.
Those guys *really* could use some competition around here. If I have
some spare time next weekend, I may pick it up and fix it myself (but
not at the expense of my warranty... need to check on that).

Now that I hear that Honda's have the
same problem, I regret even less my decision to go with Yamaha.

Next time, you might consider Mercury as well. They're building their
own powerheads this year (they no longer use Yamaha). And they have
two "sailboat" friendly 9.9's (large dia props, low gear ratio, 25"
shafts) which seem to be a few pounds lighter than Yamaha or Honda or
anybody else I can see. I'm not sure what the difference is between
those two models (Bigfoot & Prokicker) except Prokick offers power
trim. So Bigfoot is lighter (96lbs).

Rick

yamaha 15 vs yamaha 9.9
 

lid wrote:

On Wed, 21 Mar 07, sherwindu wrote:
Actually, repairing a blocked carb on the Yamaha is tiresome, but not that
difficult.
After dissassembly,

....... (the tiresome part.... as well as reassembly)

just run a very fine wire through the jets to open them up.

That's the "not that difficult" part.

A more pro-active way would be to buy only premium gasoline. Make sure your
fuel system is clean, hoses, tanks, etc. Use a stabelizer like Sea Foam or
Stabil in the gas tank. Put a fine filter (about 10 micron) in line with your fuel
delivery system.

Honda has a screw on the side of the carburetor that, with a half
turn, allows the bowl to drain (thru a tube, out, next to the pee
hole... pretty handy :-).

Yamaha has the same screw. If you are going to be away from the boat for more than
few weeks, you should drain the carbs. I don't think that will eliminate the
problem, but
will minimize it.

My shop sevice manager says that's the most
important thing I can do to prevent gum up. "Running" the carb dry
won't empty it completely. He mentioned everything else on your list
as well.
I asked if I could have it back in a few days. He shook his head and
said "Maybe a few weeks". Frankly, my money's on "Months", we'll see.
Those guys *really* could use some competition around here. If I have
some spare time next weekend, I may pick it up and fix it myself (but
not at the expense of my warranty... need to check on that).

Now that I hear that Honda's have the
same problem, I regret even less my decision to go with Yamaha.

Next time, you might consider Mercury as well.

I hope there will not be a next time for me as I am getting close to the age
of 'shipping oars'. Of course, if I find no solution to this carb problem, maybe
the next step is a class action suit against Yamaha. I paid big bucks for this
engine and got an unreliable pain in the neck.

They're building their
own powerheads this year (they no longer use Yamaha). And they have
two "sailboat" friendly 9.9's (large dia props, low gear ratio, 25"
shafts) which seem to be a few pounds lighter than Yamaha or Honda or
anybody else I can see.

Well, a 'few' pounds won't make a big difference. It remains to be seen just how
high (not low) a gear ratio they come up with. My Seagull had a whopping 4 to 1
ratio.
No manufacturer has yet come close to that. It seems like all these four strokes
have very
tiny jets for fuel economy or possibly pollution control. That makes them sitting
ducks for
blockage. When the outboard gurus come up with a solution for that one, I'm
interested.

I'm not sure what the difference is between
those two models (Bigfoot & Prokicker) except Prokick offers power
trim. So Bigfoot is lighter (96lbs).

My Yamaha is about 100 pounds, so 96 pounds is no big deal.

Sherwin



Rick

yamaha 15 vs yamaha 9.9
 

sherwindu wrote:
It remains to be seen just how
high (not low) a gear ratio they come up with.

You say to-may-to, I say to-mah-to. I'd say 4:1 is lower than 2.92:1.

My Seagull had a whopping 4 to 1ratio.

Yup, they don't make 'em like they used to. But wasn't it a much lower
horsepower engine? It would need all that leverage to push the same
load.

No manufacturer has yet come close to that.

Not that I know of either. At least not at 9.9hp or above. Your T9.9
is 2.92:1. That's as low as I've seen currently. Mercury is 2:42:1 and
Honda is 2.33:1.

My Yamaha is about 100 pounds, so 96 pounds is no big deal.

Yamaha spec sheet shows 108. For me, 12lbs might be big enough to tip
the balance, all else being equal.

Rick

yamaha 15 vs yamaha 9.9
 

Charlie Morgan wrote:
a 1992, which has had the carb cleaned TWICE
in 15 years

Do you have any tricks that haven't already been mentioned to keep
your jets from clogging during non-use?

Rick

yamaha 15 vs yamaha 9.9
 

Charlie Morgan wrote:
I ALWAYS add Stabil to gas when I fill
up my jerry cans.

I've been hearing about Stabil more and more. I've never needed or
used it until now. I've always just run my carbs dry when I get in. If
small jets are in my future though, guess I'd better stock up. Does
"Stabil" have any competition... any sort of generic stuff, lower
price, that can do the same thing?

Rick

yamaha 15 vs yamaha 9.9
 

Rick,

Stabil is good for stored or little used fuel, but it is no substitute
for draining or at least running a carburetor dry. Stabil was real good
at keeping the tetraethyl lead in gasoline from oxidizing and forming
the nasty varnish that used to be such a headache.

If you really need to store a carbureted engine when you can not drain
the float bowl, get the engine warm and pop the fuel line into some very
light oil (Marvel is good) and let it suck that in. When the engine
chokes to a smoking halt, all the internals of the carburetor are filled
with oil and will not be damaged by moisture or varnished at all.

Worked for us for years. I just restarted a SB chevy based marine
engine that we had not run for seven seasons and the only tough part was
finding my rod to run the oil pump so we could prime the lube system.

Matt Colie
Lifelong Waterman, Licensed Mariner and Pathological Sailor

lid wrote:
Charlie Morgan wrote:
I ALWAYS add Stabil to gas when I fill
up my jerry cans.

I've been hearing about Stabil more and more. I've never needed or
used it until now. I've always just run my carbs dry when I get in. If
small jets are in my future though, guess I'd better stock up. Does
"Stabil" have any competition... any sort of generic stuff, lower
price, that can do the same thing?

Rick

yamaha 15 vs yamaha 9.9
 

Charlie Morgan wrote:
I would suspect that the jets on a
4.5 HP lawnmower would be a LOT smaller than the jets in a 9.9 HP
Yamaha outboard.

Speaking of which, my lawnmower carb is first on the priority list
tomorrow morning. It cranks easy enough but it's running like crap
(already changed the plug and air filter).

Rick

yamaha 15 vs yamaha 9.9
 

Matt Colie wrote:
Stabil is good for stored or little used fuel, but it is no substitute
for draining or at least running a carburetor dry.

That's what I'm thinkin'. I'll just be more diligent than I've needed
to be past. I think I must have left gas in the bowl last time
because I thought I'd be using the boat again in the next few days.
That turned into a couple of weeks and there I am.

Rick