Testing instructions below each CDI
Most ATVs have a green/white wire to the F - R switch
This wire must be grounded when in F or there will be no spark when engaging starter.
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!
|
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!
|
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.
|
3HN-00
89 Big Bear 89 Moto4
|
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.
|
3HN-10
90 - 94 Big Bear 90 - 94 Moto4
|
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. 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.
|
3HN-20,30
95 - 96 Big Bear 95 Moto 4
|
3GD-30
96 Warrior
First unplug everything from CDI. You need to check resistance, white to red on stator side. Should be 200 Ω. 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.
|
4GB-00
93 - 95 Kodiak
|
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
|