Testing instructions below each CDI
1UY-20
87 Warrior
First unplug everything from CDI. You need to check resistance, yellow to green and grey to blue on stator side. Should be 200 Ω each. Red to brown should be 300 Ω. No resistance from any of these wires to ground. Black/red must be grounded by ign switch when on. Black must be ground always. Black/white must not be grounded. Coil primary orange should be 0.5 Ω. If all this is true, CDI is bad. NOTICE, this CDI will only work with a OEM Yamaha ignition switch!
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1YW-20
87 - 88 Big Bear 87 - 89 Moto4
First unplug everything from CDI. You need to check resistance, yellow to green and grey to blue on stator side. Should be 200 Ω each. Red to brown should be 300 Ω. No resistance from any of these wires to ground. Black/red must be grounded by ign switch when on. Black must be ground always. Black/white must not be grounded. Coil primary orange should be 0.5 Ω. If all this is true, CDI is bad. NOTICE, this CDI will only work with a OEM Yamaha ignition switch!
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2XK-20
88 Warrior
First unplug everything from CDI. You need to check resistance, yellow to green and yellow to blue on stator side. Should be 200 Ω each. White/green to red should be 300 Ω. No resistance from any of these wires to ground. Black must be ground always. Black/white must not be grounded. Coil primary orange should be 0.5 Ω. If all this is true, CDI is bad.
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3HN-00
89 Big Bear 89 Moto4
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3GD-00
89 Warrior
First unplug everything from CDI. You need to check resistance, yellow to green and grey to blue on stator side. Should be 200 Ω each. White/green to red should be 300 Ω. No resistance from any of these wires to ground. Black must be ground always. Black/white must not be grounded. Coil primary orange should be 0.5 Ω. If all this is true, CDI is bad.
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3HN-10
90 - 94 Big Bear 90 - 94 Moto4
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3GD-20
90 - 95 Warrior
First unplug everything from CDI. You need to check resistance, yellow to blue on stator side. Should be 200 Ω each. White/green to red should be 300 Ω. No resistance from any of these wires to ground. Black must be ground always. Black/white must not be grounded. Coil primary orange should be 0.5 Ω. If all this is true, CDI is bad.
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3HN-20,30
95 - 96 Big Bear 95 Moto 4
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3GD-30
96 Warrior
First unplug everything from CDI. You need to check resistance, white to red on stator side. Should be 200 Ω each. Green to brown should be 300 Ω. No resistance from any of these wires to ground. Black must be ground always. Black/white must not be grounded. Coil primary orange should be 0.5 Ω. If all this is true, CDI is bad.
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4GB-00
93 - 95 Kodiak
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Please feel free to contact us any time with your questions or comments, and your feedback is appreciated.
Tom Bauer
(410) 549-6649
Email Waterloo Specialties
This page last updated on 04-17-2020
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