1 Knocking sound on cold start (video) Mon Mar 09, 2015 5:31 pm
BelgianBiker
active member
Hi guys,
I'm new here and I'm glad to be a part of the forum
I never had the need to be on here since my knowledge isn't that great to resolve your problems, and I never had any problems of my own... 'till now unfortunately.
I did great research before deciding what my next motorcycle would be, after an unfortunate crash on the Isle of Man and wrecking my previous Honda.
I chose for the almighty Brick, almost bulletproof, and great for touring.
Bought my K100LT (January 1989) from the first owner, she looked great and had the original cases.
First things I did was changing all the fluids, filters, battery and the notorious spline lube.
Now she makes an awful knocking sound on cold start, it goes away on higher RPM's as you see/hear in the video (the frequency of the knock increases also if I increase engine speed a little until it fades away).
Once the engine is warm, it's gone.
Power delivery is fine, no other complaints.
I removed the heat-shield, because it rattles a little bit.
The knock is really audible near the alternator, and also on the other side (the left side of the engine).
Had a BMW-guy look at the video and he thinks it turns on 3 cylinders in the beginning (he couldn't hear it in real because my engine was warm once I got to him).
I think it sounds different than that.
What could be the problem? Perhaps something like a valve or such (but hey, I'm no expert)?
I'm not certain and I plan on checking my valve clearance, synchronizing the throttle bodies very soon.
I had to post it here because my sleep is suffering from this
I started filming right after I started her.
https://www.youtube.com/watch?v=3rfcGdKrvVE
I'm new here and I'm glad to be a part of the forum
I never had the need to be on here since my knowledge isn't that great to resolve your problems, and I never had any problems of my own... 'till now unfortunately.
I did great research before deciding what my next motorcycle would be, after an unfortunate crash on the Isle of Man and wrecking my previous Honda.
I chose for the almighty Brick, almost bulletproof, and great for touring.
Bought my K100LT (January 1989) from the first owner, she looked great and had the original cases.
First things I did was changing all the fluids, filters, battery and the notorious spline lube.
Now she makes an awful knocking sound on cold start, it goes away on higher RPM's as you see/hear in the video (the frequency of the knock increases also if I increase engine speed a little until it fades away).
Once the engine is warm, it's gone.
Power delivery is fine, no other complaints.
I removed the heat-shield, because it rattles a little bit.
The knock is really audible near the alternator, and also on the other side (the left side of the engine).
Had a BMW-guy look at the video and he thinks it turns on 3 cylinders in the beginning (he couldn't hear it in real because my engine was warm once I got to him).
I think it sounds different than that.
What could be the problem? Perhaps something like a valve or such (but hey, I'm no expert)?
I'm not certain and I plan on checking my valve clearance, synchronizing the throttle bodies very soon.
I had to post it here because my sleep is suffering from this
I started filming right after I started her.
https://www.youtube.com/watch?v=3rfcGdKrvVE