1978 Baja Boat with a 140 HP Mariner

BajaMikey

Recruit
Joined
Aug 14, 2007
Messages
4
Hey, Im new here and i got a pretty serious problem..... This is my first boat and its in great condition. The motor when i got it ran awesome. I put alot of hours on it durring the weekends the past couple of months and every time i went out it seems to get more and more doggier. Now i have a problem. Ive always had a fuel leak somewhere in the motor, it has tripple carbs and its hard to tell where its coming from. Also when i hit the gas its very doggy and then it takes off good and runs great. When i get on the gas and hold the throttle half way, it never stays one speed its always slowing down or speeding up. Im thinking its a fuel problem. What do you guys think?
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
29,022
Re: 1978 Baja Boat with a 140 HP Mariner

Mike, It is likely a fuel problem. Clean and install new gaskets in each carb, and set the float heights. Replace floats if they are saturated with fuel. Rebuils fuel pump, and adjust idle mixture and you should be set.

A look at the spark plugs may tell you which carb is running rich. If it is the bottom two plugs, the fuel pump is a likely candidate.
 
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