QuadMan49

Good work Gw, Did you weld the extended foot rests, or the previous owner? I'm thinking of doing something similar to my quad. The reason is because stock setup does not have much of a foot rest.

Thanks for all the feedback! Here's how the original CDI got blown: After riding several minutes the ATV suddenly stopped and quit running. I quickly found that the positive terminal on the battery broke off while riding from all the vibration of 20 years. (The engine was not running at this point) After wedging it back on, the quad started up & ran fine, but due to the bumpy road the cable kept coming off, the engine dying each time. After doing this three times the 4 wheeler would only turn over, and as it turned out, it lost spark because the CDI got blown.

Hello everyone, it's been a while since I was here last. I finally found the correct used CDI on eBay for $315. After plugging it in, the 4-wheeler runs good again. Success! The only thing I don't understand is why the original CDI got burnt by connecting the battery terminal back 3 times while it was on. You would think it would blow a fuse first!

In my case, the CDI clearly got fried. Still looking for a replacement, any info on where to find a slightly cheaper one?

I'll try repairing the CDI. If that does not work, looks like my only option is to buy a overpriced new one.

1 Hour of chipping away, and my first gimps of the circuit board. it would be ten times faster without all those mixed in white plastic bits.

I already tried one of those aftermarket CDIs with no luck.

4x4, The CDI should have 2 plugs: 1 with 6 pins, and the 2nd with 8 pins.

Keep us posted if the CDI works.

One of the connectors is slightly different on mine, so it's not compatible with my quad. Also one of the reviews says: 1.0 out of 5 stars Did not work for Yamaha big bear or wolverine 350 Reviewed in the United States 🇺🇸 on March 5, 2021 Verified Purchase Came on time but item does not work! I have a 98 Yamaha wolverine 350, and a 2000 Yamaha big bear 350, I tried on both and didn’t work.

Ok.

Thanks for the help guys. I'll try repairing my OEM burnt CDI, if that does not work, I will halve buy a new OEM one.

Would a Kodiak 400 CDI work on a Big Bear 400? The connectors seem to be the same.

Regular synthetic Mobile-1. Works well in all small engines.

The photo makes it look like melted plastic but it's not. I removed some silicone/plastic material with a tool.