Sound of metal grinding

jtanc39

.060 Over
Joined
Aug 10, 2016
Messages
120
Location
Singapore
Ride
Rocket Touring 2008
Fellow bikers, just wondering if anyone had the experience. Whenever I ride my bike pass 120km/h, I'll hear a grinding (metal to metal) noise when I relax the throttle. Just cannot figure where it's coming from, other than the clutch or maybe the brake rotors.

Any advice would be greatly appreciated!
 
Is the grinding noise just at moment you relax the throttle, or does it continue until you slow down some ? Also, are you closing the throttle completely, or just dialing it back to stay at a particular cruise speed ?
Can you better pinpoint where the sound is coming from, transmission area, final drive, right side, left side etc. Did the noise just start ? Had anything recently been done to the bike ? Tire changes, recently ran over by a dump truck ? Any additional info you can provide will help us figure it out.
 
Thanks for prompting.

Somehow the noise only comes when I go above 120km/h and it happens when I close the throttle quickly. I wish i could pin point the sound but the noise is usually (brief less than a second). The only relatively new thing on my bike is my pretech brake calipers. No recent accidents... Thanks in advance.
 
Timing chain?
Usually when engine is reducing in RPM the timing chain will be at its loosest.
Try giving I a rev in neutral and staitioary and listen st the front of the engine right side. Give it a rev then reduce the rpm rapidly and listen for any rattle.
Just an idea
 
Last edited:
Good idea! I'll try is later.
 
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