Waterloo Specialties

New Custom CDI for replacement of
discontinued or too expensive parts

CDI Repair Services

 

 

 

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!

 

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 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-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 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-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 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.

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