'88 Mariner 60 Hp Bogs Down Under Load

[outdoorsman1]

I have a '88 Mariner 60 hp, 3 Cyl, 2 Carbs. I replaced a piston last winter myself because it overheated. I brought the block in and got it checked out to make sure it was not warped. Everything was good so I got it bored out and put a .015 oversized piston in it. I did everything by the manual. I put all new gaskets in and impeller. I cleaned the carbs and also put new needles and floats in them. There also is a new switch box. I brought it into a mechanic, they synced the carbs and tweaked some other things. (They didn't tell me exactly.) When I picked it up they said it was ready to go. As soon as i put it in the water and got a load on it, the motor died. I called the mechanic and asked them why it didnt work. They said they didnt know and that I needed to bring it in and they also wanted more money to look at it again. It will idle and high idle in the water just fine, put as soon as you put it into gear it dies. Im looking for any suggestions thanks, Austin

 

[Coloradolakeboy]

Re: '88 Mariner 60 Hp Bogs Down Under Load

Sounds like an idle adjustment, the mechanics probably ran the motor on muffs. The adjustment is best to be done on the water under load. Bump your thread if you do not get a response, it's probably a simple adjustment you can do.

 

[CharlieB]

Re: '88 Mariner 60 Hp Bogs Down Under Load

The increased exhaust back pressure once in the water requires almost 1/4 turn more idle fuel mixture than best idle on the hose.

Once in the water and in Forward gear, readjust to best idle plus almost 1/8 turn out. Test holeshot acceleration. Any hesitation, in the slightest, add more idle fuel, just the screw driver blade width and repeat holeshot. Repeat adjustment to perfection.

A heavier loaded boat, pulling up a skier, will require slightly more idle fuel.