Yamaha Towny MJ50J, 1982

[tomven1967]

Where is the CDI located on the MJ50J? What does it look like? This scooters plug gets all gunked up with unburned oil & gas and I suspect the CDI stops working when it gets warm
Thank you,
Tom

[John]

pg 20 of the manual. square box next to rectifier, fuses and turn signal box. Follow wiring back. Never seen one in the flesh. Hope helps.

[tomven1967]

John,
Thank you!! That diagram is the first time I've ever been able to locate a good picture of the CDI. I sure hope this solves my problem. I'm hoping that a new CDI will provide a constant & substantial spark to keep the fuel & oil burning. My darn plug keeps getting fouled & I'm thinking that it's because there isn't enough spark to keep things burning. I think I've ruled out about everything else. What do you think?? Sound Plausible??
Tom

[tomven1967]

http://www.boats.net/parts/search/Yamah ... parts.html

This is a good site for parts. Good diagrams, but nothing that really depicts where the CDI is located. The diagram you provided looks like it is accessed from the top; raise the seat, remove the battery and the the bracket holding the battery. I'm at work now (slow day) and will post my findings later.

Thanks again!,
Tom

[John]

You may need to source a universal CDI to try and work on the Yammy.

[tomven1967]

Success!! I had to remove the battery & the metal tray that it sits in. Then I could see the CDI attached to the back side of a bracket that holds some other electrical components. From below I had to remove the bracket that it was attached to so I could remove it from the bracket. In all it took about 10 minutes. I already ordered a new one from www.boats.net. Hopefully this will keep the spark plug sparking.
Tom