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Hi
My 76 900ss the exhaust pipe at the rear cylinder now glows red hot even at warm up . Is this likely to be ignition timing or carb issues or something else? Any suggestions appreciated
Tony

When was the last time you replaced the carby rubber spacers ?
Sucking will will cause all sorts of damage, at idle you say never heard of that before

Let us know the outcome

Cheers Marty

Cheers Marty - will give it a burl

Something related to carb sync, for sure.

So it could be leaky spacers, something plugged in the carbs or ?

Time to R&R those carbies. I have had this happen to a customer bike after carb rebuild while doing the sync. It was dramatic to say the least. I fired the bike up and was syncing when the customer came by. One of the pipes started glowing..... Took awhile before it stopped while I was fiddling around with the adjustments on the carbies. Yes I was using carb stix and following my own advice.

I would be checking the ignition 1st on a early squarecase.
They are the major cause of headaches on most of the early ones.