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Yamaha 8 High thrust question

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Doug
Captain

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USA
457 Posts

Initially Posted - 01/29/2004 : 22:50:58

I think we're going to take the plunge and repower. Here's a question for anyone using a Yamaha 8 HP high thrust:

Can you tilt it out of the water on the standard C25 mount? Does the XL and L shaft tilt out?

Does the tiller hit the transom? Can you turn the engine in for tight turns?
Any other comments before I let 20 boat units slip away?

Doug - #1913 Noeta

Edited by - Doug on 01/29/2004 22:52:46

Doug
Captain

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USA
457 Posts

Response Posted - 01/31/2004 : 23:14:56

Anyone use this motor? Does it tilt out?

Edited by - on

dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts

Response Posted - 02/01/2004 : 09:16:04

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Doug
 I think we're going to take the plunge and repower. Here's a question for anyone using a Yamaha 8 HP high thrust:

Can you tilt it out of the water on the standard C25 mount? Does the XL and L shaft tilt out?

Does the tiller hit the transom? Can you turn the engine in for tight turns?
Any other comments before I let 20 boat units slip away?
<hr height="1" noshade id="quote"></blockquote id="quote">

Doug,

I haven't chimed in until now because I don't have any specific knowledge on the Yamaha, but since no one else has stepped up to the plate, I'll offer some suggestions.

When you go to the dealer to look at the outboard, have them tilt it up for you. After it is tilted, measure the distance from where the outboard is mounted(transom mount) to the farthest point forward that the outboard has pivoted. Compare this distance to the distance on your boat from the outboard mount(both raised and lowered) to the transom.

Additionally, when you are at the dealer, turn the motor right and left again taking measurements to see how far forward of the mount the outboard/tiller extends, again comparing this measurement to the measurements from your boat.

Good luck.

Edited by - dlucier on 02/01/2004 09:26:31

ClamBeach
Master Marine Consultant

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3072 Posts

Response Posted - 02/01/2004 : 12:27:44

I can't answer for sure either... a friend has one on his Mac 26 (transom cutout). From using it over the years, I THINK it would tilt ok and clear the water with a 'standard' Garhauer mount, possibly depending on where the mount was positioned vertically. The powerhead size really isn't that much bigger than my Honda 8 "Classic" longshaft.

I think you'll have a bigger issue with weight.

The Garhauer mount does have a lot of travel... but the lift 'assist' is marginal even with the Honda Classic 8 (about 90 lbs?)... you'll need some good upper body strength to lift the heavier Yamaha up from the bottom position. Others on this forum have upgraded to an "Offshore" mount (by Garelick I believe) that has more robust lift assist.

Bottom line is that unless you're young and strong I think you'll need to upgrade to a different mount to lift any of the new motors... and any mount that will work with the rather bloated "new generation" Honda's should have plenty of clearance/assist for the Yamaha too.

IMHO I'd give the Honda "Classic 8" in the long-shaft (23.5") edition a look. I think they are still producing them... I think lots of other people have trouble with the weight and bulk of the new generation motors.

Edited by - on

Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts

Response Posted - 02/01/2004 : 13:30:07

Clam... I think the weight of the Classic 8 in a long shaft is 79 lbs. The few XLS that were produced in that version were 81 lbs, but unfortunately no longer available. Great motors for someone not wanting electric start and a 22.5 inch shaft is long enough.

Edited by - Arlyn Stewart on 02/01/2004 13:31:30

ClamBeach
Master Marine Consultant

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Response Posted - 02/01/2004 : 18:37:05

"...The few XLS that were produced in that version were 81 lbs..."

Well, when I bought it about 10 years ago... it was a lot lighter than it is now. (grins)

I'm thinking about how I could add some heavy rubber "truckers straps" to the Garhauer mount to help the lift 'off the bottom'. I'm somewhat surprised that none of the mfgs use elastomer straps to aid their lift. It would be really easy to adjust the lift assist to fit different motors by adding/removing straps.

Edited by - on

Doug
Captain

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USA
457 Posts

Response Posted - 02/01/2004 : 19:02:28

I'm replacing an old Honda BF10. It's around 80 lbs. The new motor is going to be about 20-25 lbs more. I'll be able to lift it, but my crew won't. On the other hand, my crew can't seem to master the pull cord start. The electric start will make them happy. I considered the off shore mount, but with the new OB and upholstery on this Spring's to do list the "Boat Unit" jar is really scraping bottom

For those of you who just love the old Hondas- I know where one's going to be for sale...

Edited by - Doug on 02/01/2004 19:06:54

Dave Bristle
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Djibouti
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Response Posted - 02/01/2004 : 20:11:07

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Doug
 ...I'll be able to lift it, but my crew won't. On the other hand, my crew can't seem to master the pull cord start. The electric start will make them happy.<hr height="1" noshade id="quote"></blockquote id="quote">
Just leave it down (in neutral) when you're sailing--it's not that big a deal if you're not racing or trying to reach a distant destination. I do it often when daysailing, and then lift the motor back at the slip.

Edited by - on

matsche
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USA
280 Posts

Response Posted - 02/02/2004 : 09:02:55

Dave:

You reminded me of another stupid question I've always wanted to ask. When sailing on boats with inboard diseal engines, I've always been taught to leave the engine in gear when sailing so that the prop doesn't spin. Supposedly causes unnecessary wear and tear on the shaft seal. Is there any similar thinking with outboards?

Edited by - on

ClamBeach
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Response Posted - 02/02/2004 : 09:17:56

"Is there any similar thinking with outboards?"

I suppose so... but you're trading quite a bit of drag for it. IMHO The wear factor probably wouldn't come into play unless you're spending LOTS of time sailing... like crossing oceans.

Also, outboard shaft seals are a lot easier to change than inboard diesels. If I was on an extended cruise I'd raise or tilt the motor. (circumstances permitting of course)

Edited by - on

aeckhart
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Response Posted - 02/02/2004 : 12:00:37

Doug, I have a sailing friend who owns an older C-25 swing keel who bought a Yamaha 8 high thrust last year. She got the electric tilt which she says is fantastic. She is very pleased with her motor and finds that it provides as much power or more than her old Johnson 10 HP. I believe she replaced her old mount with a new one but I don't know why. The old Johnson 10 probably weighs as much.

Anyway, she's so enthusiastic about this motor that I am planning to replace my Evinrude 9.9 with the Yamaha 8 - sometime.

Edited by - on

RichardG
Admiral

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USA
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Response Posted - 02/02/2004 : 12:16:26

<blockquote id="quote">quote:<hr height="1" noshade id="quote">I believe she replaced her old mount with a new one but I don't know why<hr height="1" noshade id="quote"></blockquote id="quote">

Al:

Did she replace it with the newer Garhauer mount or another? The newer Garhauer mount has metal bushings instead of plastic, is a bit beefier than before and has two lifting springs (only one on the old one).

Edited by - on

frich
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USA
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Response Posted - 02/02/2004 : 16:37:48

Doug

I have a 9.9 hp high thrust on my 84 C25. It is quite heavy (approx 100lbs) It does tilt out of the water, but make sure your mechanism is greased well.

On mine over the years the cowling cracked due to the stress when tilting. I fabricated an aluminum bracket and placed it beneath the cover for extra support. I can post pictures of this.

Frank Rich
84 C25 SK

Edited by - on

Doug
Captain

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USA
457 Posts

Response Posted - 02/02/2004 : 19:37:03

Please post the pictures Frank. I'd be interested in seeing them.
I actually stopped by the dealer today and looked at the motor for the first time. Told them to put the "Sold" sign on it.

Edited by - Doug on 02/02/2004 19:38:56

kenobie51
1st Mate

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USA
35 Posts

Response Posted - 02/06/2004 : 12:18:43

Doug,
Something to consider. Tohatsu/Nissan has just come out with a new 9.8 HP four stroke. Is advertised as the lightest weight in that class at only 81 lbs. It is available in a 25 inch shaft, electric start for a lot less money than Honda or Yamaha. Go to tohatsu.com You don't hear much about Tohatsu, but they make a top quality motor. I have had a 8 HP two stroke for 10 years, and it has been flawless. Wish I could justify the new 9.8.

Larry Knobel
80 C25 SK

Edited by - on

Scott L
1st Mate

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52 Posts

Response Posted - 02/06/2004 : 12:27:44

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by frich
 Doug

I have a 9.9 hp high thrust on my 84 C25. It is quite heavy (approx 100lbs) It does tilt out of the water, but make sure your mechanism is greased well.
<hr height="1" noshade id="quote"></blockquote id="quote">

Yamaha? If so, I have a '89 high thrust, long shaft, electric start that I bought with zero information. Do you know if they all have an alternator if they are electric start? If I wanted to check this, do I just start it, unhook both leads from the battery and test the wires with a meter?

Thanks

Edited by - on

Ed Montague
Captain

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USA
499 Posts

Response Posted - 02/06/2004 : 13:14:18

Scott, I don't think that you will need to disconnect the leads from the battery to check. First off if it is electric start it probably has an alternater, second, check the battery voltage with the motor off and then with it running. It should increase with the motor running. These alternaters are not very high out-put so don't expect them to charge the battery very well. If you don't see an increase then you may have a blown fuse in the alternater. This can happen if you accidently switch the battery combiner (if you have one) while the motor is running. You can purchase a digital multimeter at Radio Shack or even Harbor Freight very inexpensively.

Edited by - on

Scott L
1st Mate

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Response Posted - 02/06/2004 : 13:23:25

Thanks Ed. I think I will contact the dealer to see about getting a manual for the thing.

thanks again,

Edited by - on

Doug
Captain

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USA
457 Posts

Response Posted - 02/06/2004 : 20:01:18

Scott- Where do you sail? My very first sail was on a C22 on Howard's Prairie (SP?).

Edited by - on

Scott L
1st Mate

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Response Posted - 02/06/2004 : 20:11:05

Doug,
Howard Prairie is the home of the Rogue Yacht Club. We sailed there a few times last year after we bought our sailboat and will be heading up there this spring after the thaw. Did you live around here? My wife and I both grew up in Jacksonville.

Edited by - on

Doug
Captain

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USA
457 Posts

Response Posted - 02/06/2004 : 20:21:59

Grew up on a "ranchette" in Eagle Point.

Edited by - on

Scott L
1st Mate

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52 Posts

Response Posted - 02/06/2004 : 20:31:45

"Prather Ranch" organic beef? They sell burgers at the growers market and I always say they are the best hamburgers I have ever had, can't wait until spring so i can get 'em again.

Edited by - on

lcharlot
Master Marine Consultant

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Antigua and Barbuda
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Response Posted - 02/06/2004 : 22:29:26

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by kenobie51
 Doug,
Tohatsu/Nissan has just come out with a new 9.8 HP four stroke. Is Larry Knobel
80 C25 SK
<hr height="1" noshade id="quote"></blockquote id="quote">

Looking at the specs on Tohatsu's web site, their "new" 8 and 9.9 4-stroke outboards look like they offer pretty much the same features of the older, "classic" Honda and Yamahe outboards. The light weight is a plus, but they are lacking two key features that are standard on the late model Hondas and Yamahas: the gigantic "high thrust" prop and 3:1 gearing (on the Yamaha), and the 12-amp alternator. It is that big prop that makes the Honda/Yamaha stand out as an exceptionally good sailboat auxilliary.

Edited by - on

osmepneo
Past Commodore

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USA
1420 Posts

Response Posted - 02/07/2004 : 06:43:57

Yamaha maybe

Edited by - on

Gary B.
Admiral

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USA
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Response Posted - 02/07/2004 : 09:09:48

Scott: You have a Yamaha 9.9 electric start? I bought one of the first ones about 85/86, now have a 2000. They both had alternators. And I don't want to argue with Ed, but mine have always kept my battery banks hot, although in the San Juans when I use the most juice, I am also often under power. I think it's at LEAST a 10 amp charger. Great engines, IMHO.....but heavy....

Gary B
s/v Encore!
Vice Commodore

Edited by - on

Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts

Response Posted - 02/07/2004 : 09:39:56

Don's attitude about Honda's has given me thought, actually reoccurring thought to the problems inerrant in over engineering.

While I'm sure most have not followed the drama of the Edson small boat steering system, its a classic example of over engineering which brought about several points for failures. What could be more simpler than a tiller? But... I love standing at the wheel to get exercise while cruising.

Most of us don't need an auto choke on our outboards... but I recall a few years ago, that big catamaran that pulled into the harbor, the two Honda outboards slung underneath given opposite thrust and that big sucker doing a 180 in its own boat length. I'm betting its boats like that where remote control is wanted that are the cause of the frigging auto choke...

More... often means more complicated, more expensive, more repairs, and more frustrating.

The idle fuel circuit is so frigging small on a Honda... that if the throttle is parked on idle... or a spec of dirt or water contaminates... it won't start, ... but we love that slow smooth idle when approaching the slip.

Do our wants have a high cost? Perhaps more than we would care to honestly admit.

Edited by - on

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