Yamaha outboard cranks but won’t start refers to when the Yamaha outboard engine crankshaft rotates but fails to start the engine. This video will detail the reasons why a Yamaha outboard motor cranks but will not start. Keep in mind that this repair information pertains to carburetor and fuel injection models, 2-stroke or 4-stroke.

Before we get into why your outboard cranks but won’t start, I highly recommend you download the factory repair manual before you attempt to service or repair your Yamaha outboard engine. The download repair manual covers every aspect of repair—from basic maintenance to complete engine overhaul. It also contains critical specifications, diagrams, pictures and step-by-step repair procedures.

To download a repair manual instantly just go to www.911manual.com.

Once you get to the website, click on where it says Marine Manuals, then click on where it says Yamaha Manuals, and then just find the manual you need and download it to your tablet or computer.

Okay, moving on. So if your Yamaha outboard motor cranks but will not start, check for one or more of the following possible malfunctions.

Engine cranks but won’t start (fuel injection models)

Lanyard stop switch not installed or in wrong position. Correct this by resetting lanyard stop switch.
Weak batter or bad starter motor, battery voltage drops below 8 volts while cranking (ECM cuts out below 8 volts), (Fuel pump requires 9 volts). Correct this by replacing or charging the battery. Inspect condition of starer motor. Check condition of battery cables and terminals.
No fuel. Correct this by ensuring the primer bulb is firm. Key-on engine to verify that the fuel pump runs for two seconds and then turn off. Measure fuel pressure.
Flywheel misaligned during installation. To correct this remove flywheel and inspect it.
Blown fuse. Replace fuse. Inspect the engine’s electrical components and harness.
Main power relay not functioning. To correct this, listen for relay to “click” when the key switch is turned on.
Spark plugs. To correct this, remove the spark plugs from each cylinder. Connect spark plugs to a spark gap tester. Crank the engine or use DDT output load test for each ignition coil and observe spark. If no spark is present, replace appropriate ignition coil. If spark is present, replace spark plugs.
Air in the fuel system. To correct this check for air in the fuel supply manifold. More information on this can be found in the download repair manual.
Low or no fuel pressure to injectors. To correct this check fuel manifold pressure. Refer to the download repair manual for checking procedures.
Low or no compression. To correct this check the compression.
In gear (tiller models). Make sure the outboard is in neutral.
Internal powerhead damage. To correct this inspect engine and repair as needed.
Ignition. Test ignition system. Refer to testing procedures in repair manual.
ECM not functioning. Refer to the download repair manual on how to test whether or not the ECM is not functioning.

Engine cranks but won’t start (carburetor models)

Improper starting procedure. Correct this by reviewing the engine’s starting procedure as outlined in the Operation and Maintenance Manual. You can also get this information in the download repair manual.
Fuel tank empty or too low. Improperly mixed fuel or contaminants such as water, dirt or debris in the fuel.
Fuel tank air vent closed or restricted. Correct this by checking air vent on fuel tank. The air vent must be open completely and fee from contaminates or blockage.
Pinched or restricted fuel line or a lose fuel line connection. Correct this by inspecting all fuel lines and replace them as needed and be sure to tighten fuel line connections.
Dirty or restricted fuel filter.
Choke solenoid or enrichment valve not operating.
Needle and seat in the carburetor is either stuck open or close.
Improper carburetor jet, restricted jet or idle mixture screw out of adjustment.
Improper float level.
Low fuel pump pressure.

These repair instructions apply to the following Yamaha models:

1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 2hp 3hp 4hp 5hp 6 hp 8hp 9.9 hp 15hp 25 hp 28hp 30 hp 35 hp 40 hp 55hp 50 hp 60hp 65hp 70hp 75hp 80 hp 85 hp 90hp 115hp 130hp 140hp 150 hp 175hp 200hp 225hp 2-stroke 1 cylinder 2 cylinder 3 cylinder V4 V6

1995 1996 1997 1998 1999 2001 2002 2003 2004 2005 2006 2007 2008 2009 2hp 3hp 4 hp 5hp 6hp 8 hp 9.9hp 15 hp 20 hp 25 hp 40 hp 50 hp 60 hp 90 hp 115 hp 130 hp 150 hp 2-stroke and 4-stroke models.


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