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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: cancira on August 15, 2025, 03:05:11 PM

Title: 1996 BMW K1100LT Weird Knocking sound
Post by: cancira on August 15, 2025, 03:05:11 PM

A new sound has emerged from my bike, a knocking one. It seems as if it was coming from the starter or alternator, the gas tank is also making a loud noise. I am attaching a video for you all to hear. Any advice is well appreciated. Apparently the starter is also leaking oil.

https://jumpshare.com/s/l6LuJaCbYq1i8JNwRg7w

Title: Re: 1996 BMW K1100LT Weird Knocking sound
Post by: daveson on August 16, 2025, 12:54:52 AM

If both these sounds started at the same time, they might be related, and over fuelling is a possibility that comes to mind, which just might result in your brick running on only three cylinders, that can cause a knock.

Removing the return hose from the tank and directing it temporarily into a bucket, just might improve the problem, tending to confirm this guess. Directing a spark plug lead to a spare, earthed, spark plug, should result in a drop in revs. If it doesn't result in a rev drop for one of the cylinders, that's a problem.