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Author Topic:   BRP Johnson 25-HP

jimh posted 03-31-2007 07:50 AM ET (US)
Bombardier's Johnson brand of outboard motors has a reduced line this year, and the largest motor they sell is a 25-HP four-stroke. The motor is very likely a re-badged Suzuki. It is an interesting V2 motor with 538cc displacement. With the cowling off, it looks like simplicity itself, and it has a very straightforward and uncrowded layout. A top-mounted carburetor feeds the fuel and air via a rather elaborate cast intake manifold to each cylinder bank.
It is anticipated that BRP will introduce their E-TEC direct-injection two-stroke motors in this horsepower range soon, so this model may not be around for too much longer.
For more details see:
http://www.johnson.com/en-US/Engines/Showroom/ProductSpecs. htm?productID=J25

whalersailer posted 03-31-2007 10:42 AM ET (US)
Jim,
Some of us call this engine configuration a V-Twin ;-)
V-Twins are notorius for producing more low end torque than inline configurations of similar displacement (at least in the motorcycle world). I wonder if this generalization will hold true for this little outboard engine as well?
-WS
Roswell posted 03-31-2007 10:57 AM ET (US)
I can't imagine a two cylinder engine in a V configuration would be easily balanced? More torque makes sense, but is there also more vibration? More wear on the engine?
That looks like it would be a nice motor for the 13' if you didn't have other people in the boat. Personally i'd wait for the smaller E-tech, though.
jimh posted 03-31-2007 11:54 AM ET (US)
Further research shows this Johnson 25-HP is most certainly a re-badged Suzuki, and it is a new design from them. So while it probably won't be around as a "Johnson" for long, it should be in the Suzuki product line for quite a while. See the Suzuki version at
http://suzukimarine.com/sr06/df25vt/index.php
I was struck by the motor's very simple layout and appearance. Just looking at it gives you a feeling that you could take it apart and put it back together again. Those small valve covers on each cylinder head look easy to remove, and I could imagine myself checking the valve clearance on the overhead camshaft and two valves concealed beneath it.
Coincidentally, I was over visiting my Mercury dealer this morning and he had a new Mercury 25-HP four-stroke. That motor is an in-line two-cylinder with fuel injection and SmartCraft digital instrumentation. I took the cowling off and found it appeared quite a bit more complicated. And, ironically, as I was looking at it, the service manager commented that "you can't work on that motor without a computer."
fourdfish posted 03-31-2007 01:32 PM ET (US)
As myself and others have said before, that all the engines
will have computers and will need software to fix sooner or later!

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Author	Topic: BRP Johnson 25-HP
jimh	posted 03-31-2007 07:50 AM ET (US) Bombardier's Johnson brand of outboard motors has a reduced line this year, and the largest motor they sell is a 25-HP four-stroke. The motor is very likely a re-badged Suzuki. It is an interesting V2 motor with 538cc displacement. With the cowling off, it looks like simplicity itself, and it has a very straightforward and uncrowded layout. A top-mounted carburetor feeds the fuel and air via a rather elaborate cast intake manifold to each cylinder bank. It is anticipated that BRP will introduce their E-TEC direct-injection two-stroke motors in this horsepower range soon, so this model may not be around for too much longer. For more details see: http://www.johnson.com/en-US/Engines/Showroom/ProductSpecs. htm?productID=J25
whalersailer	posted 03-31-2007 10:42 AM ET (US) Jim, Some of us call this engine configuration a V-Twin ;-) V-Twins are notorius for producing more low end torque than inline configurations of similar displacement (at least in the motorcycle world). I wonder if this generalization will hold true for this little outboard engine as well? -WS
Roswell	posted 03-31-2007 10:57 AM ET (US) I can't imagine a two cylinder engine in a V configuration would be easily balanced? More torque makes sense, but is there also more vibration? More wear on the engine? That looks like it would be a nice motor for the 13' if you didn't have other people in the boat. Personally i'd wait for the smaller E-tech, though.
jimh	posted 03-31-2007 11:54 AM ET (US) Further research shows this Johnson 25-HP is most certainly a re-badged Suzuki, and it is a new design from them. So while it probably won't be around as a "Johnson" for long, it should be in the Suzuki product line for quite a while. See the Suzuki version at http://suzukimarine.com/sr06/df25vt/index.php I was struck by the motor's very simple layout and appearance. Just looking at it gives you a feeling that you could take it apart and put it back together again. Those small valve covers on each cylinder head look easy to remove, and I could imagine myself checking the valve clearance on the overhead camshaft and two valves concealed beneath it. Coincidentally, I was over visiting my Mercury dealer this morning and he had a new Mercury 25-HP four-stroke. That motor is an in-line two-cylinder with fuel injection and SmartCraft digital instrumentation. I took the cowling off and found it appeared quite a bit more complicated. And, ironically, as I was looking at it, the service manager commented that "you can't work on that motor without a computer."
fourdfish	posted 03-31-2007 01:32 PM ET (US) As myself and others have said before, that all the engines will have computers and will need software to fix sooner or later!