Motor Quits After It Is Warm.

[Heritage Guy]

My wife has a 1982 XS400 Heritage Special. The bike was running beautifully until we were in the middle of a ride one day and the motor started to quit after the bike had warmed up. I don't believe it is the spark plugs because the odds of both going simultaneously is slim. Could it be an ignition coil? Could it be possible that a worn clutch could cause this issue? I feel the bike will require servicing of the clutch.

Your thoughts and input would be appreciated.

 

[xschris]

What do the plugs look like? Are they white? If so your running too lean. The bike might be over heating. If you have non-stock air filters and exhaust that will cause it. Make sure the carbs are adjusted and clean!! Take them apart and clean all the little passages, there are threads in the forum on this. How about some pics of the bike with your setup if it is not stock.

 

[16VGTIDave]

TCI module. Fuse connections and/or wiring connectors. Faulty ignition switch. Faulty kill switch. I've had each of these cause similar symptoms.

The clutch is a separate issue.

 

[Heritage Guy]

Thanks for the replies. I will assess your recommendations.

 

[Heritage Guy]

TCI module. Fuse connections and/or wiring connectors. Faulty ignition switch. Faulty kill switch. I've had each of these cause similar symptoms.

The clutch is a separate issue.

16VGTIDave, thanks for the response. In your experience, did your similar symptoms occur after the bike had been warmed up and running for a while?

 

[16VGTIDave]

16VGTIDave, thanks for the response. In your experience, did your similar symptoms occur after the bike had been warmed up and running for a while?

Yes. TCI module initially would cause problems after a long ride. A couple hundred km. As it got worse, the distance / time running was reduced. All the other failures could happen at any time without warning, but were more likely to occur after running for a while.

 

[Heritage Guy]

16VGTIDave,

Thanks for the response. It sounds like the TCI could be the issue as your description is exactly what is occurring with the bike. I have a winter project ahead of me.

 

[Heritage Guy]

16VGTIDave,

I believe that my 1982 Yamaha XS400 Heritage Special has the SOHC. Would the bike have a CDI module as opposed to a TCI module?

 

[16VGTIDave]

SOHC for certain. CDI? Not as far as I'm aware. Should have a TCI. But with a 30 year old bike, anything is possible.

 

[xschris]

Both would have a TCI ignition. Your bike is a sohc engine if it is a heritage special.

 

[Heritage Guy]

Thanks for the information guys, much appreciated.

 

[Heritage Guy]

Where is the TCI located on the bike?

 

[xschris]

It's under the battery box.

 

[xschris]

Looks like this.

 

[Heritage Guy]

Thanks...oh, and here is a photo of the bike.

http://www.xs400.com/forum/picture.php?pictureid=5943&albumid=837&dl=1419211509&thumb=1

 

[xschris]

You need to post a bit larger pic I see it now in your photo album.

 

[Heritage Guy]

Thanks for the pic of the unit.

I am trying to upload a better photo of the bike.

 

[levdir]

That's a tidy-looking bike. Great colour.