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Port side engine will start and run, but then wont shut off…

Customer Question
Port side engine will start...
Port side engine will start and run, but then won't shut off with the switch. I have to go turn the perko to off and then the ignition switch to start to get it to turn off.

I replaced the switch but that didn't do it.

Ideas?

Thanks,

Tim Pauls
Submitted: 13 years ago.Category: Boat
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Answered in 1 hour by:
6/21/2009
Marine Mechanic: Captain Dave, Marine Mechanic replied 13 years ago
Captain Dave
Captain Dave, Marine Mechanic
Category: Boat
Satisfied Customers: 3,847
Experience: USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience
Verified
Hello. What kind of motor please?
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Customer reply replied 13 years ago
Engine Type4-Cylinder, 4-stroke Twin High Output Yamaha Marine Engines
Displacement1052cc
FuelRegular Unleaded
Type of IntakeEFI (Electronic Fuel Injection)
StartingElectric
IgnitionDigital
Pumps155mm High-Pressure
TransmissionDirect Drive From Engines
Impeller3-Blade, Stainless Steel
Overall Length23’0” (7m)
Beam8’6” (2.6m)
Draft16” (.5m)
Marine Mechanic: ROCKET, Marine Mechanic replied 13 years ago
ROCKET
ROCKET, Marine Mechanic
Category: Boat
Satisfied Customers: 999
Experience: I HAVE BEEN WORKING ON BOATS OVER 25 YEARS
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Welcome to JA

if you just turned the motor off using the perko switch, you just fried your voltage regulator

I bet that your key switch is bad on the helm
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Customer reply replied 13 years ago
I have tried replacing the helm key switch and that didn't make any difference. The motor doesn't turn off with the iginition switch unless I turn off the perko, and then turn the iginition switch to start.

Seems like there must be a short somewhere or something isn't grounded?

This is a 3 year old jet boat, and the starboard side motor works fine.

Frustrating.
Marine Mechanic: ROCKET, Marine Mechanic replied 13 years ago
ok
Take the cowling off motor

find the white wire coming out of the CDI box
um plug it

Start motor

now touch the white wire from CDI box to the engine block
motor should turn off
if not you have a bad stop diode in the CDI

means that you need a new CDI box
ROCKET
ROCKET, Marine Mechanic
Category: Boat
Satisfied Customers: 999
Experience: I HAVE BEEN WORKING ON BOATS OVER 25 YEARS
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ROCKET and 87 other Boat Specialists are ready to help you
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Customer reply replied 13 years ago
Okay, will try that tomarrow.
Marine Mechanic: ROCKET, Marine Mechanic replied 13 years ago
OK

let us know
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