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Thanks for your prior answers as they were dead on. My new question is this. My 1986 mercruiser 140 is almost perfect now except for the fact that the motor hesitates, or stalls upon quick acceleration. Other than that, it runs great at all speeds. If I accelerate slowly... it's fine Please advise.

Submitted: 222 days and 13 hours ago.

Category: Boat

Value: $15

Status: AWAITING CUSTOMER ACTION

Posted by Captain Dave 222 days and 13 hours ago.

Answer

Hello. I assume this motor is carbureted, and that sounds like your acceleration jet is clogged, causing too much air and not enough fuel when you accelerate. You will probably need to have it overhauled.

222 days and 13 hours ago.

Reply

This carb was just overhauled last year and has done it ever since

Posted by Captain Dave 222 days and 13 hours ago.

Answer

OK, then I suspect the problem IS with the carb - something was not done right in the overhaul.

Accepted Answer

I have to differ greatly with Dave...

I am pretty sure that his first intuition was correct, The carburetor is the issue, or more specifically the Accelerator pump is not working properly in the carburetor. The accelerator pump works by actually "Squirting" raw fuel into the throat of the carburetor when the throttle is advanced. The reason for this is to give the engine a shot of fuel to catch up in RPM and the Carburetor time to catch up with the engine. If you advance the throttle supper slow you don't need this extra fuel, only when you advance the throttle quickly or even normally do you need the "Shot".

Take a look down the throat of the carb and have a friend advance the throttle. You should see Two steams of fuel "Squirting" Into the throat as the throttle is advanced. Spitting fuel from the accelerator pump system doesn't count, and is bad....

Accepts:
Expert:	Dominick
Pos. Feedback:	99.3 %
Answered:	4/14/2009

Marine Mechanic

21 Years Experience as Mechanic, 18 Yrs Boat Yard Owner/Mechanic, Factory Certified

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Thanks for your prior answers as they were dead on. My new question is this. My 1986 mercruiser 140 is almost perfect now except for the fact that the motor hesitates, or stalls upon quick acceleration. Other than that, it runs great at all speeds. If I accelerate slowly... it's fine Please advise.

Answer

Hello. I assume this motor is carbureted, and that sounds like your acceleration jet is clogged, causing too much air and not enough fuel when you accelerate. You will probably need to have it overhauled.

Reply

This carb was just overhauled last year and has done it ever since

Answer

OK, then I suspect the problem IS with the carb - something was not done right in the overhaul.

Accepted Answer

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