engine hesitation

mtsu287

Recruit
Joined
Jun 14, 2003
Messages
2
Hi all. OK. I've had a lot of trouble getting a boat that I just purchased up and running for the season. Here's the skinny...<br /><br />It's a 1979 Mercury 175 hp Outboard. It will begin to fire the cylinders after about 10 seconds of starting with the choke. (pretty normal response time I'm told) I can get her to scream when I have her in neutral and I'm throttling her, but at idle she dies. After I put it in gear I can only go slow because if I throttle her up she dies. Then after about 30 minutes of running on the water at this slow speed she'll die and won't start back up.<br /><br />I took the recommendation of a buddy to clean out the carbs when he noticed a lot of fuel leaking out. So I took them all apart and noticed a large about of "clear jello". (yup, the floats were stuck) I sprayed everything down REAL GOOD with carb cleaner and reassembled. The fuel problem is gone but I'm left with major idle and throttle hesitation problems.<br /><br />Anything to try would be truly helpful!<br />-shaun
 

gss036

Commander
Joined
Jan 18, 2003
Messages
2,914
Re: engine hesitation

Try putting a can of SEAFOAM in about 3/4 gallon of 50-1 premix and let it run for awahile and then let it soak for about 1/2 hours and try again. It will help clean the jets and clear out any carbon build up. You might have to rod out the fuel passages with tips cleaners for torches.
 

sharkcat

Petty Officer 1st Class
Joined
May 4, 2003
Messages
285
Re: engine hesitation

It sounds like the mixtures are too lean or its not synchronized properly.Get a manual & do a link & synch,then adjust the idle mixture with the engine running in forward gear in the water.<br />When you cleaned the carbs did you clean the fuel system as well?Is there a fuel filter between the tank & the engine?If the fuel system was still dirty you may have sucked more crud into the carbs as soon as you started the engine.A filter will help stop this.Hope this helps :)
 

mtsu287

Recruit
Joined
Jun 14, 2003
Messages
2
Re: engine hesitation

link & synch? could you explain? i do have the manual. thanks!
 
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