It looks like theses motors use the same block, likely intake and
exhaust. HP difference may come from carb and rpm.

Weight of these motors is pretty much the same. Often the more
powerful motor will use less fuel at certain speeds as it doesnt have
to work as hard.

The only issue that would point at the 40 HP is money. If cost for the
50 isnt prohibitive then get that. I wouldnt recommend getting the 40
and lateron tweak it to get 50 HP (not worth it).

I dont know how well tubing with a pontoon boat works ... might
require twin 400HP ?

Matt


(Marko) wrote in message . com...
I'm buying an 18' pontoon that weighs 1050 lbs. I decided on the 40hp
Honda but I'm wondering if the 50hp would be better for pulling my
kids on a tube. Besides tubing, I'll also be trolling for walleyes,
trout, etc. Both motors weigh 212 lbs.

Any recommendations? I need to decide soon.

I wonder if you can ride in one (with a load) with a 50hp Honda (lightest
50hp 4 stroke) and a 60hp Yamaha ( lighest 60hp 4 stroke and FI for 2005)?

Sometime we buy certain brands of outboard motors becuase we like a
particular dealer's service department and they carry only brand X and Y but
not Z.

--
Bill Kiene

Kiene's Fly Shop
Sacramento, CA, USA

Web site: www.kiene.com


"Marko" wrote in message
om...
I'm prepared to go with the 50hp if my dealer is willing to work with
me. My boat is rated for a max of 75hp so no problem there. My only
question is can I troll as slow with the 50hp as I can with the 40hp?
I have little experience with 4-strokes but I hear you can idle right
down to 1 mph.

Thanks for the responses.

On Sun, 22 Aug 2004 17:39:45 -0400, "IBNFSHN" wrote:

There is a lot more to it than just carb jets. For instance a kit to upgrade
a 9.9 to a 15 runs you about $800.00. That is according to my local Johnson
dealer.

A few years ago I did extensive examination of parts microfiches to
find out the difference between my Evinrude 20, and the 25 and 30
models which are all the same block. I posted the details here.
The difference is air/fuel in and exhaust out and maintaining the
balance. I ended up opening the intake manifold restriction with a
dremel tool to equal that of the 25, and installing the main jet
specified for the 25, effectively converting the 20 to 25 hp for the
price of a jet ($7.)
Going up another step to 30 hp would have required enlarging the
exhaust output (drilling a small hole), which would have entailed re
and re the power head, new gasket kit, etc. I didn't want to go that
far.
I suppose it wouldn't be that easy with more modern engines due to the
electronic FI systems, but maybe one could simply replace a control
module in addition to mod.s as above.

Scott W.

Jim wrote in message thlink.net...
I had looked into the 6 to 8 horsepower engines. The answer I got was
carb jetting. Otherwise exactly the same engine. I thought the 9.9 to
15 might be the same issue.

Not just carb jetting. Need to add more air to match the increased
fuel from the larger jets to keep the air/fuel mix correct. Thus the
carb venturi is bigger too, so the whole carb body will be a different
part number.

On the Johnson 2 stroke 9.9 & 15, the 15 had (had?) a different tuner
on the exhaust to resonate at higher RPM. Other engine combos have
also had different intake manifolds and/or different cylinder heads.

%mod%

!!! Boat Purchase Update !!!

I called my dealer and asked what it would take to upgrade from the
Honda 40 to the 50. He said "don't waste your money, they're basically
the same engine." He also said you don't gain much moving up in
horsepower with pontoons, which I've heard before. He was very
insistant that the 40hp was the best motor for my "smaller" pontoon. I
don't believe everything this guy says. The 40 I agreed to is a 2003
so I'm wondering if he just wants to move it. It's a huge store so I'm
sure he has 2003 50's too. Honda told me that the 2003's and 2004's
are IDENTICAL so I thought I'd save a couple hundred bucks.

Should I stick with the 40 or push for the 50?

On 26 Aug 2004 06:35:29 -0700, (Marko) wrote:

Should I stick with the 40 or push for the 50?

=========================================

It's very rare to hear someone complain about having too much power
but the opposite is quite common.

There is some degree of truth that more HP doesn't change the speed that much.
Pontoons are not speedboats and they never really "plane". You do get a degree
of laminar flow across the pontoons and there is definately a step but it takes
a lot more power to get a tad bit more speed.
When I went down from 75 to 60 my top speed changed about 1-2 MPH.

Ask them what the prop recomendation is for both and what the predicted RPM is
with that prop.

On Thu, 26 Aug 2004 10:40:58 -0400, Wayne.B
wrote:

On 26 Aug 2004 06:35:29 -0700, (Marko) wrote:

Should I stick with the 40 or push for the 50?

=========================================

It's very rare to hear someone complain about having too much power
but the opposite is quite common.

Short, sweet and succinct - the perfect answer.

Later,

Tom

On Thu, 26 Aug 2004 09:58:58 -0700, Scott W. wrote:

On 26 Aug 2004 06:35:29 -0700, (Marko) wrote:

I called my dealer and asked what it would take to upgrade from the
Honda 40 to the 50. He said "don't waste your money, they're basically
the same engine."

Get a spec. sheet and read it. If everything's the same, why not have
10 more HP?

Another good answer, but I suspect that it's a case of leftoveritis on
the part of the dealer. I have a good friend in the boat business and
he will turn himself inside out to move New Old Stock in particular
engines.

However, it makes sense to go with the 50 if only because, as Wayne
said, in this case, morererer is betterererrerrrrr. When I talk to
folks about boats, the main complaint is almost always underpowered.

Unless he makes the 40 VERY attractive, stick to your guns and get the
50.

Ten horse power can make a difference here - the additional 10
horsepower is like adding 25% more Kw.

By the way, when they say they are the same engine, that's true to
this extent - they may be the same long block, it's the timing and
computer controls controlling fuel flow that give you the extra
horsies.

Later,

Tom
S. Woodstock, CT
-----------
"Angling may be said to be so
like the mathematics that it
can never be fully learnt..."

Izaak Walton "The Compleat Angler", 1653

On 26 Aug 2004 15:52:09 GMT, (Greg) wrote:

There is some degree of truth that more HP doesn't change the speed that much.
Pontoons are not speedboats and they never really "plane". You do get a degree
of laminar flow across the pontoons and there is definately a step but it takes
a lot more power to get a tad bit more speed.
When I went down from 75 to 60 my top speed changed about 1-2 MPH.

That's interesting. I thought the opposite because of the nature of
the two hulls. I would think that you would get more speed because of
the nature of the round, non-displacement type hulls. Unless that 1-2
Mph represents a large percentage of total speed.

Ask them what the prop recomendation is for both and what the predicted RPM is
with that prop.

Another good point.

Later,

Tom