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24-12-2009, 08:47
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#2
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Moderator Emeritus
Join Date: Sep 2007
Location: Eastern Tennessee
Boat: Research vessel for a university, retired now.
Posts: 10,406
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Manufacturers will change the jets in the carburetor and possibly a couple other things in the exact same engine block to change the horsepower, and then charge more money for jets with larger holes. And yes, the manufacturers have already thought of people who want to buy the cheaper engine and then put in larger jets and do other mods and have made it prohibitive to do this. I had the same idea at one time as well.
If you do not mind paying the additional money, the same weight engine with the greater horsepower is probably the more practical engine.
__________________
David
Life begins where land ends.
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24-12-2009, 09:40
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#3
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
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Tohatsu makes ALL Nissan outboards and many smaller (< 10HP) Mercury* outboards.
You’ll pay a slightly higher premium for the Mercury or Nissan branding, but here is no difference in features, warranty, etc. Parts and manuals etc., for the 3 brands, are universally* interchangeable.
* At one time, a "detuned" Tohatsu 5HP was also marketed as a Mercury 4HP, so make certain you know what you’ve actually got, prior to exchanging parts.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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24-12-2009, 09:55
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#4
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Registered User
Join Date: Jul 2007
Location: W Florida
Boat: Still have the 33yo Jon boat. But now a CATAMARAN. Nice little 18' Bay Cat.
Posts: 7,086
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Quote:
Originally Posted by GordMay
Tohatsu makes ALL Nissan outboards and many smaller (< 10HP) Mercury* outboards.
You’ll pay a slightly higher premium for the Mercury or Nissan branding, but here is no difference in features, warranty, etc. Parts and manuals etc., for the 3 brands, are universally* interchangeable.
* At one time, a "detuned" Tohatsu 5HP was also marketed as a Mercury 4HP, so make certain you know what you’ve actually got, prior to exchanging parts.
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Gord's right.
Almost all parts are interchangeable.
Almost.
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24-12-2009, 10:13
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#5
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
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Quote:
Originally Posted by Therapy
Gord's right...
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Don't be redundant.
ie: Gord is + Right (synonymous)
Are you aware of any particular pitfall differences?
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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24-12-2009, 10:22
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#6
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Moderator Emeritus
Join Date: Sep 2007
Location: Eastern Tennessee
Boat: Research vessel for a university, retired now.
Posts: 10,406
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Gord is the man. He even has his own unique avatar now. He earned it!
__________________
David
Life begins where land ends.
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24-12-2009, 11:24
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#7
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Registered User
Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,253
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The Tohatsu 3.5 is a 4 stroke. I bought it because it was light. It has issues but I have overcome them. This is the 3 rd year in the Bahamas. The shift leaver froze (Corrosion) and there is no lube point You must take the power head off to remove it as the non replacable handle will rip off as the pressure increases. The Carb jets have brass plugs and are not servicable unless you drill out the plugs. The fuel shutoff pops out of the holder untill you put a screw in to hold it from poping up The engine cover rear latch broke off. It is part of the cover so I had to fabricate a bracket or buy a new cover. The fuel tank is small and under the cover but has no filter and it is difficult to find one small enough to fit. A briggs & Stratton lawn mower filter will work. The pull cord has parted 4 times in 2.5 years. Cheap but runs well if the fuel is clean
__________________
Will & Muffin
Lucy the dog
"Yes, well.. perhaps some more wine" (Julia Child)
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24-12-2009, 11:41
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#8
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Registered User
Join Date: Apr 2009
Location: Cruising the Caribbean
Boat: Morgan 461
Posts: 96
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David M, thanks for your answer. The thought of modifying a 2HP outboard to give it more power hadn't really crossed my mind. I was more concerned with the fact that the two weigh exactly the same. And one of the reasons I'm looking for a small outboard is weight. I want my wife to be able to move it without much effort (which is just a euphemism for "I'm a wimp and she'll probably never move it anyway").
However, when you're buying used in a relatively small market (southern Ontario), pickings are not great. So I have to settle with what's available.
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24-12-2009, 11:45
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#9
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Registered User
Join Date: Apr 2009
Location: Cruising the Caribbean
Boat: Morgan 461
Posts: 96
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Antares, quite a laundry list for that outboard!
When you say "drill out the plugs", does that mean drill them out just to be able to replace them?
Is it possible that Honda outboards have stainless steel jets? I believe I read something like that while doing my research, but didn't pay much attention to it as I didn't really understand what that meant.
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24-12-2009, 12:47
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#10
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Registered User
Join Date: Jul 2007
Location: W Florida
Boat: Still have the 33yo Jon boat. But now a CATAMARAN. Nice little 18' Bay Cat.
Posts: 7,086
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Quote:
Originally Posted by David M
Gord is the man. He even has his own unique avatar now. He earned it!
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Who poked his eye out?
And why?
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24-12-2009, 12:56
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#11
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
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Quote:
Originally Posted by Therapy
Who poked his [sic: Gord's] eye out? And why?
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One of the Moderators did that, because I deserved it.
Don't screw with CF management! (I taught them to be tough)
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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24-12-2009, 13:13
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#12
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Registered User
Join Date: Aug 2008
Location: Wash DC
Boat: PETERSON 44
Posts: 3,165
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The tohatsu notsohotsu 4 is a better stern anchor then the 2 or the 2.5. For a lunch hook the 2 or 2.5 may be okay.
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24-12-2009, 14:59
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#13
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Registered User
Join Date: Jan 2007
Posts: 497
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We have a 3.5 hp Tohatsu (aka Nissan, Mercury). The dealer told us that the 2, 3.5 and 5 are the same engine with different carbs. When we bought it, the spec sheets for all 3 showed the same weight.
BTW, it has been a great little motor.
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24-12-2009, 21:10
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#14
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Registered User
Join Date: Mar 2009
Location: Southern Chesapeake Bay
Boat: Norseman 430, Jabberwock
Posts: 1,414
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I have wondered, since it can't cost much to put bigger jets in, if part of the reason the manufacturers charge more for the hotted engines is that they assume that doing so will result in an somewhat increased number of warranty claims.
At one time I had a Nissan 2.5. I stumbled upon a Mercury 3.3 ( odd that that was different from the other's 3.5) at a great price, and since it also had a neutral shift and I had young sons starting to operate the dinghy, I bought it.
I was surprised to find that the Merc 3.3 (alone amoung the other clones as far as I could determine) had the prop geared down more (slower turning). More horsepower, same prop dia. and pitch as the 2.5, but turned slower! That didn't make sense to me. It burned gas twice as fast as the 2.5.
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25-12-2009, 05:58
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#15
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Registered User
Join Date: Oct 2007
Posts: 7
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The 2, 2.5 and 3.5 are the same engine other than the carburetor. All manufacturers build engines in one size and then offer it in a detuned version as a smaller hp engine as it is not cost effective to design all models independently. If you had a 2 and wanted to turn it into a 3.5 you would simply replace the carburetor.
There is no provision to access the air mixture jet as there is no reason to get to it. Cleaning the carburetor properly(by dipping it for three hours in carburetor cleaner) is all that is required to fully clean any carburetor that has not been properly maintained. All carbureted engines, regardless of brand or size, just need to be drained of fuel after use as this will prevent fuel evaporation from the carburetor. That evaporation leaves a residue which clogs up the jets inside of it. Fuel over 60 days old should be discarded as it will become unstable and contaminated.
The (4S)4, 5 and 6 hp are on a completely different frame than the (4S)2, 2.5 and 3.5. The (2S) 4, 5 and 6 hp are also on a completely different frame than the (2S)2.2, 2.5, 3.3 and 3.5 hp. Within the same frame size there was/is no difference in gearing between the Tohatsu and its Nissan and Mercury alternative labels.
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