Conversion of Tohatsu 15

[bravo11]

Can a 15hp be converted to a higher horsepower? If so, how high and what needs to be done? Thanks.

 

[pvanv]

Re: Conversion of Tohatsu 15

What model? Some 4-strokes can be converted from 15 to 20.

 

[Sea Rider]

Re: Conversion of Tohatsu 15

If it's a 2 strokes nope, it's already at the highest level, next 18 is another story.
If it's a 4 strokes, yes, carb change.

Happy Boating

 

[TOHATSU GURU]

Re: Conversion of Tohatsu 15

If it is a 4-stroke A or B it cannot be altered. If it is a -stroke C you can.

 

[John_S]

Re: Conversion of Tohatsu 15

If it's a 2 strokes nope, it's already at the highest level, next 18 is another story.

I'd like to know more about 18hp 2-stroke increases. I have an 18E but thought there wasn't any built-in upgrade path. I thought the next size up was allso a bore/stroke change.

 

[TOHATSU GURU]

Re: Conversion of Tohatsu 15

There is no upgrade from an 18 2-stroke.

 

[natanz123]

Re: Conversion of Tohatsu 15

Hi, I own a 2010 Nissan 15 Hp 4 strock outboard. Before I made a decision of what motor to buy-15 HP or 20HP I called Producer"s representative and asked if there is a essential difference between them. The answer was-No,Not really.I Doubt very much that changing the only carb, one can increase motor's power up to 30%.
Natanz123

 

[pvanv]

Re: Conversion of Tohatsu 15

Natan,

If you have an NSF15C, you can install the carb for the NSF20C, and you will get the extra 5 hp.

 

[TOHATSU GURU]

Re: Conversion of Tohatsu 15

I Doubt very much that changing the only carb, one can increase motor's power up to 30%.
Natanz123

Is that because you know so much or because you know so little? Actually your looking at this from the wrong perspective. The carb change is restoring the engine to its designed hp. I would agree with you that if an engine was at its true hp making a carb change would not give you a 30% increase.