I haven't been on the forums for a while. What brought me back in was a increasingly frequent loud knocking/rattling noise I was hearing from the right side of my 2016 C650 Sport. After some research it seemed that my problem is the cam chain tensioner. I checked to see if I had the mechanical or the hydraulic and I do have the mechanical. I decided to have the dealer do the work after looking into how much work is involved. Also wasn't sure if there would be any retiming necessary. My dealer said mine is the first one they've had come in with a failed tensioner. I guess they didn't sell that many of them. I bought mine used from them in 2019 with 1800 miles. The bike now has just over 8000 miles. They're hoping the change out to the hydraulic setup will fix the problem but are concerned about how loud the noise is. I guess maybe something in my favor based on what I've read on here is that the engine starts and runs. I found this video that is exactly how my engine sounds. The comments to the video seem to indicate replacing the tensioner fixed the problem.
Also, the noise goes away after some engine run time. I guess I'll have to wait and see when the tensioner gets replaced. Don't know what it is with BMW and valve trains. My brand new 2022 S1000RR bought from the same dealer had a timing chain tensioner recall done a few months ago. It also had an intake camshaft recall done too. On the car side, this is reminiscent of the N20 timing chain issues.
Hope to report back in a few days with at least some decent news.
Also, the noise goes away after some engine run time. I guess I'll have to wait and see when the tensioner gets replaced. Don't know what it is with BMW and valve trains. My brand new 2022 S1000RR bought from the same dealer had a timing chain tensioner recall done a few months ago. It also had an intake camshaft recall done too. On the car side, this is reminiscent of the N20 timing chain issues.
Hope to report back in a few days with at least some decent news.