Sound of metal grinding

[jtanc39]

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!

 

[Rocket Scientist]

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.

 

[jtanc39]

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.

 

[Mittzy]

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

 

[jtanc39]

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

Good idea! I'll try is later.