Page 1 of 1
'81 engine ticking/rattling noise
Posted: Wed Jun 26, 2019 10:36 pm
by sin486
I purchased am '81 CBX-B a few months ago, it has been making a ticking/rattling noise from the left side of the bike which can be heard best at low RPM's. After some research, I initially thought it was the alternator but with a sophisticated stethoscope (screwdriver), the noise seems to be loudest at the engine block. Any ideas on further diagnosis? Or is this noise expected and I can ignore?
Video in which you can clearly hear the noise:
https://www.youtube.com/watch?v=AzSEKjTZt2w
Re: '81 engine ticking/rattling noise
Posted: Thu Jun 27, 2019 6:17 am
by steve murdoch icoa #5322
Doesn't sound too bad to my backyard mechanic ear. The engine guys will be along.
Maybe a slight air exhaust leak. Header clamps snug?
Re: '81 engine ticking/rattling noise
Posted: Thu Jun 27, 2019 6:58 am
by daves79x
Sounds, too, like an exhaust leak at low idle, but above that, just normal 'sewing machine' sounds. You could quiet that down to almost zero by installing a set of oversize cam joints.
Dave
Re: '81 engine ticking/rattling noise
Posted: Mon Jul 01, 2019 11:03 pm
by sin486
Is it possible to replace the cam joints while doing a valve adjustment - only the valve cover has to come off? I also assume that I'd only have to take off two of the four cam shafts to get the the cam joints. I don't want to fiddle too much with the chains.
The next step would be to find a supplier of the oversized cam joints.
Re: '81 engine ticking/rattling noise
Posted: Tue Jul 02, 2019 4:55 am
by daves79x
Yes, just removal of the valve cover and the 2 left-side cams is all you need to do. But I’d first insure your cam chains are adjusted properly and the adjusters, particularly the cam-to-cam one is working properly. Then make sure you have a shop manual for cam removal/installation.
Louis has the oversized joints here in the States, Six Center in Holland carries them also.
Dave