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+1 on the Seafoam. Just keep running it with a good cleaner additive. My sons was doing the same thing and the more it runs the better it runs. 2 or 3 tanks and no problems.

Started out as my dads 1982 XS400 Maxim with the custom look bars et al. It was finished in a burgundy. Nice bike that he pulled when he went motorhoming. He gave it to me to keep for my son and give him eventually. It wasn't running and the forum here helped figure things out so it now runs...

Muffler $$$ ? pics please

Do you have the mounting hardware for the windshield? I am guessing that was a pretty universal sort of windshield. Should fit my sons 82 xs400 maxim bobber.

Fixed!!! The replacement CDI box was bad, so, after checking the voltage to make sure the rectifier/regulator wasn't overcharging I put a tested CDI box on and VOILA. music. Runs great now.

trust me, I understand. I have rebuilt the carbs, petcock, gone thru the electrical etc and rode it 30 miles only to have it dead the next day when my son came to ride it.

Not NOS but used and recycled. The charge current idea is next tho. Could be overloading the box???? Then what I don't know. Rectifier????

The left side not firing was the first problem in the eventual demise of my CDI. Is the plug getting a spark? Try to eliminate electrical before carbs.

Now we're talking. Thks. I did exactly that so far. We went thru and cleaned and checked every connection on the wiring harness and inside the headlamp especially. The coils were the first suspect and they both checked good. When the bike would stop running, spark stopped to both sides. This...

Wow, Incredible bank of knowledge I tapped here. :shrug:

CDI box?

Which CDI box does it have? There are 2 diff ones for 82 400's

Hi folks, new here but I know where you go when you need help. Owners on forums. I have an 82 XS400 that is to be my sons first bike. It was my dads trailering bike and it has about 9600 miles on it. It started cutting off after about 10 minutes of riding. Short cool down and it would restart...