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 8hp vs. 9.8hp - I must be stupid		  New Topic  Topic Locked
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Paul
1st Mate

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57 Posts
Initially Posted - 01/19/2006 :  16:59:37  Show Profile
Besides 1.8 horses in the name, all of the specs for an 8 and 9.8 from Nissan, Tohatsu, and Honda (9.9) are exactly the same. So what is the real benefit of the 9.8 over an 8hp outboard?
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 01/19/2006 :  17:37:04  Show Profile
More money in the dealer's and manufacturer's pockets. I have the Honda 8 XLS (high thrust) and doubt that I have ever pushed it beyond half throttle, including stopping at a dock. It has the same 12 amp alternator, the same prop, the same gearing, the same displacement,... One of our colleagues here was told by a Honda rep that the cam on the 8 made it better suited for heavy displacement hulls, and the 9.9 was better for planing hulls (perhaps peaking at a higher RPM). Could even be true...
Edited by - Dave Bristle on 01/19/2006 20:42:05
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atgep
Master Marine Consultant

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1009 Posts
Response Posted - 01/19/2006 :  19:33:43  Show Profile
For the Nissan/Tohatsu the real isssue is the 25 in shaft is only available in.....9.8 flavor.

I checked the service manual and the only differance I can find it the carb specs. The 8 has a slightly smaller carb and different jetting.

Tom.
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 01/19/2006 :  22:18:53  Show Profile  Visit Champipple's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by atgep</i>
<br />For the Nissan/Tohatsu the real isssue is the 25 in shaft is only available in.....9.8 flavor.

I checked the service manual and the only differance I can find it the carb specs. The 8 has a slightly smaller carb and different jetting.

Tom.
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Back in the 2 stroke days it was the same darn engine with a governor of some sort (so I was told, I don't know enough to tell the difference.) I did however get the xl shaft on th 8, so I'm not sure where that info comes from.
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atgep
Master Marine Consultant

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1009 Posts
Response Posted - 01/20/2006 :  12:01:02  Show Profile
Duane, I am speaking of the new 4 stroke variety. The carb diameter is 1/4 smaller and the jet setup is different. At least for the 06 year they only offer the xl in 9.8.

Tom.
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panhead1948
Captain

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345 Posts
Response Posted - 01/20/2006 :  13:56:26  Show Profile
I have an 86 7.5 Honda and the place that serviced it said that the difference between it and the bigger motor was the cam. The displacement was the same and everything. A different cam increased the hp to 9 or 10 what ever it was.
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crcalhoon
Captain

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USA
303 Posts
Response Posted - 01/20/2006 :  18:42:26  Show Profile
I was on the Online outboards web site the other day and noticed that a Tohatsu 6 HP extra long shaft 4-stroke will be available in late spring that weighs about 55 pounds. For those of us on small lakes with no tide or current to worry about, that sounds awful nice, since my little 5 HP Merc seems to push the boat along fine.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 01/20/2006 :  20:32:20  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by crcalhoon</i>
<br />...a Tohatsu 6 HP extra long shaft 4-stroke will be available in late spring that weighs about 55 pounds. For those of us on small lakes with no tide or current to worry about, that sounds awful nice...<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">
If it's two cylinders, that could be very nice. If one, then it'll be pretty noisy.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.