Yamaha Troubleshooting 3. Swap the coils. If the problem moves to the other cylinder, replace the coil. If the problem stays on the cylinder, re-check the Pulser coils.
HAS SPARK BUT WILL NOT RUN: 1. Make sure the engine is getting fuel to the combustion chamber and make sure there is no water or residue in the carburetor.
Read from Yellow (Blanker coil)
Read to Engine ground
Ohms 25-35 Ω
DVA Connected 10 Volts Minimum
ENGINE WILL NOT STOP (KILL): 1. Short the White wire from the CDI unit to engine ground. If the engine stops, the problem is in the stop circuit. If the
Yamaha
2. Check the fuel pressure AT THE CARBURETOR. You should see over 2 PSI. Check fuel lines for inner wall breakdown and wall collapse. 3. Check flywheel shear key to make sure it has not sheared due to backfiring or impact on the propeller. 4. Check spark plugs for presence of water, indicating a possible cracked block or blown head gasket. 5. Check compression, carburetor, reeds and do a cylinder leak down test. 6. Check the Blanker coil as follows as a defective Blanker coil can cause timing variance or no fire:
engine continues to run with the White wire shorted to engine ground, replace the defective CDI unit.
25/30 HP 1996-2002 (3 Cyl)
(6J8-85540-H1-00,117-6J8-H1) Service Notes: 1. Please refer to the General Troubleshooting section in the beginning of the Troubleshooting Guide for a better understanding of basic outboard principles, terminology, and repair techniques prior to attempting any troubleshooting or repairs. 2. All DVA tests are done at cranking speed unless otherwise noted. 3. All resistance tests are done disconnected from all other components. 4. Please use the Factory recommended spark plug specified and gapped at the correct setting. WARNING!!! NEVER DISCONNECT THE SPARK PLUG WIRES WHILE THE ENGINE IS RUNNING AS THIS WILL DAMAGE THE CDI UNIT. DO NOT ATTEMPT TO START THE ENGINE WITH THE SPARK PLUG WIRES NOT CONNECTED EITHER TO THE SPARK PLUGS OR A SPARK TESTER.
GENERAL NO SPARK ON ANY CYLINDER: 1. Disconnect the White stop wire and retest. If the engine’s ignition now has spark, the stop circuit has a fault. Check the key switch, harness and shift switch. 2. Inspect and clean all engine and ignition ground connections. 3. Verify the correct spark plugs are installed. 4. Check the resistance and DVA of the Charge and Pulser coil:
Read from Read to Brown (Charge Coil) Blue (Charge Coil) White/Red (#1 Pulser) Black wire White/Black (#2 Pulser) Black wire White/Green (#3 Pulser) Black wire
Ohms 164-246 Ω 277-415 Ω 277-415 Ω 277-415 Ω
DVA (Connected) 175 V Minimum 4 V Minimum 4 V Minimum 4 V Minimum
DVA (Disconnected) 210 V Minimum 4 V Minimum 4 V Minimum 4 V Minimum
NO SPARK OR INTERMITTENT ON ONE OR MORE CYLINDERS: 1. Check the resistance and DVA of the Pulser coil:
Read from Read to White/Red (#1 Pulser) Black wire White/Black (#2 Pulser) Black wire White/Green (#3 Pulser) Black wire Black/White (Secondary) Plug wire
Ohms DVA (Connected) 277-415 Ω 4 V Minimum 277-415 Ω 4 V Minimum 277-415 Ω 4 V Minimum 5.04-7.56K Ω -
DVA (Disconnected) 4 V Minimum 4 V Minimum 4 V Minimum -
2. Check the DVA on the Black/Orange, Black/White and Black/Yellow wires from the CDI unit while connected to the ignition coils. You should have a reading of at least 135 V or more.
TECH SUPPORT: 1.866.423.4832 CUSTOMER SERVICE: 1.800.467.3371 www.cdielectronics.com
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