CDI 174-9710K 1, Installation And Troubleshooting Manual

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Installation and Troubleshooting Guide
NOTE: This installation is to be completed by an Authorized Dealer or Professional Service
Technician. For questions regarding installation or warranty, call CDI Tech Support
at 866-423-4832. Do not return to the Dealer or Distributor where the part was purchased.
Contact CDI Electronics Directly for Return Material Authorization.
CDI Electronics, LLC
•
353 James Record Road SW
•
Huntsville, AL 35824 USA
Web Support: www. cdielectronics.com • Tech Support: 1-866-423-4832 • Order Parts: 1-800-467-3371
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4/7/2021 Page - 2 of 3 QF-358
2. Disconnect the Black/Yellow kill wire AT THE SWITCHBOX and retest. If the engine’s Ignition now has spark, the stop circuit has a
fault. Check the key switch, harness, and shift switch (if present).
3. Disconnect the Yellow wires from the Stator to the Voltage Regulator and retest. If the engine now has spark, replace the Voltage
Regulator.
4. Check the cranking RPM. A cranking speed less than 250 RPM will not allow the system to fire properly. This can be caused by a weak
battery, dragging starter, bad battery cables, or a mechanical problem inside the engine.
5. Check the Stator and Trigger resistance and DVA for your engine in the lists below:
Check the 2 cylinder engine as follows:
Read from Read to Ohms DVA (Connected) DVA (Disconnected)
Blue (Low speed Coil) Blue/White (Low speed Coil) 500-700 Ω 180 V Minimum 180 V Minimum
Red (High speed Coil) Red/White (High speed Coil) 28-32 Ω 25 V Minimum 25 V Minimum
Purple (#1 Trigger) White (#2 Trigger) 0.8-1.4K Ω 4 V Minimum 4 V Minimum
Purple (#1 Trigger) Engine Gnd Open 1 V Minimum -
White (#2 Trigger) Engine Gnd Open 1 V Minimum -
Check the 3 cylinder engine as follows:
Read from Read to Ohms DVA (Connected) DVA (Disconnected)
Blue (Low speed Coil) Blue/White (Engine Gnd) 500-700 Ω 180 V Minimum 180 V Minimum
Red (High speed Coil) Red/White (Engine Gnd) 28-32 Ω 25 V Minimum 25 V Minimum
Brown (Trigger) White/Black (or Black) (Trigger) 0.8-1.4K Ω 4 V Minimum 4 V Minimum
White (Trigger) White/Black (or Black) (Trigger) 0.8- 1.4K Ω 4 V Minimum 4 V Minimum
Purple (Trigger) White/Black (or Black) (Trigger) 0.8-1.4K Ω 4 V Minimum 4 V Minimum
Brown (Trigger) Engine Gnd Open 1 V Minimum -
White (Trigger) Engine Gnd Open 1 V Minimum -
Purple (Trigger) Engine Gnd Open 1 V Minimum -
NOTE: The 3 cylinder engines have several configurations to the firing order. Please refer to the Factory Service Manual to
make that determination. The pairing should always be as follows:
• Green Coil Wire goes with the Brown Trigger Wire
•
Green/Red Coil Wire goes with the Purple Trigger Wire
• Green/White Coil Wire goes with the White Trigger Wire
Check the 4 cylinder engine as follows:
Read from Read to Ohms DVA (Connected) DVA (Disconnected)
Blue (Low speed Coil) Blue/White (Low speed Coil) 500-700 Ω 180 V Minimum 180 V Minimum
Red (High speed Coil) Red/White (High speed Coil) 28-32 Ω 25 V Minimum 25 V Minimum
Purple (#1 Trigger) White (#2 Trigger) 0.8- 1.4K Ω 4 V Minimum 4 V Minimum
Brown (#3 Trigger) White/Black or Black (#4 Trigger) 0.8- 1.4K Ω 4 V Minimum 4 V Minimum
Purple (#1 Trigger) Engine Gnd Open 1 V Minimum -
White (#2 Trigger) Engine Gnd Open 1 V Minimum -
Brown (#3 Trigger) Engine Gnd Open 1 V Minimum -
White/Black (#4 Trigger) Engine Gnd Open 1 V Minimum
6. Inspect the flywheel Trigger and Stator magnets to see if they are loose or broken. Disconnect the Voltage Regulator and retest. If the
fire returns, replace the Voltage Regulator.
7. Disconnect Red and Red/White wires and retest. If the DVA tests above is withing specifications, the Switchbox is usually bad.
NO FIRE ON 2 CYLINDERS (4 CYLINDER ENGINE):
1. DVA test Stator (see
NO FIRE ON AN CYLINDER
).
2. Swap the Blue with the Blue/White Stator leads, and the Red with the Red/White Stator leads to see if the no fire problem changes. If it
does, the Stator is bad. If the problem remains on the same cylinder(s), the Switchbox or Trigger is probably at fault.
HIGH SPEED MISS-FIRE OR WEAK HOLE SHOT:
1. Connect DVA meter to the Blue and Blue/White wires and do a running test. The voltage should show a smooth climb and stabilize,
gradually falling off at higher RPM's (above 3,000). If you see a sudden drop in voltage right before the miss becomes apparent, the
Stator is likely at fault.