Powerhead Conversion

W

wright74012

Cadet
Joined
Jun 23, 2011
Messages
25
I have a 2003 Mercury 125 powerhead that I need to replace. I want to go to a 115hp to stay in specs of the boat. What would I need to convert on the 125 if I bought a 115 powerhead? Are most of the parts the same, such as Lower Unit, electrical, etc.?
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: Powerhead Conversion

You might tell us what motor you have. Inline six, inline four, and the year. an old inline six 125HP (if merc ever made them in that HP), is about the same power as a newer 115HP motor.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,618
Re: Powerhead Conversion

If its the inline six its a 68-69 model. You will need to either find a pre 71 powerhead to use your adapter plate or change the mid section to use a later model. All the parts will interchange unless it a 1980 model as ignition is different.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,618
Re: Powerhead Conversion

Just change the carbs as the only difference between a 115 and 125....
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: Powerhead Conversion

Change the cowling decal as well, so the HP police don't get you.
 
You must log in or register to reply here.
Top