Randy:
 
The M15 has a limited hull speed. TheHonda 2hp is able to provide enough power without any problem, even against a 2.5 knot current on SF Bay.  The added weight of a 5hp on the transom is too much  for the M15 to carry, in my opinion.  You can purchase a new 2hp Honda 4 stroke for $ 699.00 with a neutral. 
 I recommend you try a 5hp and a 2hp on the M15 before you buy one.  It's an important decision.
 
Rich Cottrell
 
    Randy Dawson <rdawson@surewest.net> wrote:

Sorry if this is off topic and I know this subject gets totally hashed but I am in the market for a 4 stroke outboard for my M15 and need to know the transom height or how to measure it. My boat is an 89 model with the fixed motor mount.

I know that the Honda 2hp is all I need and is the bomb BUT, Stockdale Marine has a Briggs & Stratton 5hp for less $$ AND it has neutral, forward and reverse AND an external tank so I can cruise the river all day if no wind.

Thanks to anyone who responds. All comments welcome.

Ran Dawson

Little Wing

Folsom Lake

California

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