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Motor runs fine if not in gear or at low rpms wont go over 10 mphany ideas? starts to backfire and shake has a 350 mercruser in a baretta 21 foot boat 4 barrel carb

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  • Expert
  • 243 Answers

This Could Be Many Things But If You want To Try A Few Yourself,
Fit New Spark Plugs,Clean The Carburetor,If It Does Not Show any Signs Of Improvement ,Nothing Lost Take It In For Diagnostic Check

Posted on Mar 30, 2013

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Posted on Jan 02, 2017

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SOURCE: Ihave a 1982 mercury inline-6-115hp am having carb-boat motor

floats are sticking in the carbs . rebuilding is the only cure

Posted on Apr 26, 2010

finish line
  • 207 Answers

SOURCE: 350 CID Kodiak 5.8 L chevy marine engine has water in oil

stuck thermostat bad water pump impellar about only 2 causes first check thermo should be located in the housin where all the hoses go into the motor u can check it with a pot of boiling water and a temp gaige put in water nd see what temp it opens at shop cost estimate $85.00 with part impellar estimate depending on location $200.00

Posted on Jun 27, 2009

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SOURCE: I have a 1994 Yamaha 40 HP 3 cylinder 2 stroke

all 3 carbs had A  clogged jet totally dis assembled and cleaned the carbs put them back on and the engine runs great I will need to fine tone the needle valves once I put some fresh gas in it. 
Thanks John

Posted on Jul 09, 2009

  • 5690 Answers

SOURCE: when the boat is in

The last comment you made about the hose cuffs and running good- Was that in gear or neutral? If you are using the boats throttle lever there is a cam lever for the choke which limits the throttle. It may be out of sync in the control box. If you have operating cables disconnect them at the engine and see what range of motion you have in the motor itself. Then hook up the controls and see if the cables prevent the motor from opening the carbs.

Posted on Aug 01, 2009

  • 5690 Answers

SOURCE: brand new 350 motor rev's fine but will not pass

We are going to assume there is no Rev limiter in the ignition circuit.
Disconnect the throttle, move the throttle lever by hand and see what RPM you pull. It should be able to go higher than when you had a load on it. Check your throttle stops.
If you have a 4 barrel with a secondary, look at the mechanical linkage. If you have a vacuum operated secondary, see if you have any open vacuum ports.
If this is a vacuum secondary, there are springs you can buy to change when the pulldown occurs.
Check for a clogged gas filter, kinked hose, or hole in the gas line before the fuel pump.
If this new engine is running the same carb and ignition as the old motor, check your base timing and advance.
If you have not used this boat before the new engine was installed check your prop pitch and size. The prop is like changing gears, you need to adjust throttle stops so you do not over rev or under rev. Let us know what you found.

Posted on Sep 16, 2009

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