Rattle while compression braking

[Tekime]

Hey --

2005 GS500f - I noticed a weird rattling noise coming from near the front end (mayybe the motor) while decelerating, particularly when compression braking or just easing off the throttle with RPMs.

It sounds more like a clattering loose something-or-other and hasn't affected the bike aside from the noise, but it has me worried.

Bone stock, no obvious loose parts -- anyone get this before? I've heard about the GS having rattling issues but this under fairly specific conditions.

Thanks

[Slack]

When was the last valve adjustment done?

[gsJack]

Decel at what speed?  If engine braking at low speeds a well worn front sprocket will make a noise like you describe.  It's the chain clicking off the hooked teeth.  Check the sprocket for wear.

[Tekime]

When was the last valve adjustment done?

Unknown. Bought it last summer with 8k miles in immaculate condition. Was planning on doing a valve adjust/check in the next 4-6 weeks, weather/time/cash permitting...

Decel at what speed?  If engine braking at low speeds a well worn front sprocket will make a noise like you describe.  It's the chain clicking off the hooked teeth.  Check the sprocket for wear.

Speed doesn't seem to make a difference. Interesting I'll check the front sprocket.

Just hit 12k miles on the bike BTW.

Thanks for the help any other thoughts welcome I'll post anything else I find!

[jaynavajo15]

My 06 gsf makes a similar noise I was worried as well. Shop informed me its just my front sprocket that is worn.

[Atesz792]

Been there, done that. In my case, it was a REALLY loose drive chain. Check it immediately, it's a dangerous condition!

[Tekime]

Been there, done that. In my case, it was a REALLY loose drive chain. Check it immediately, it's a dangerous condition!

Same.. lots of play. Adjusted the chain and no more noise! 

Noticed a tiny bit of wear on the outside edge of the pins like it was really slapping around in there, I better check that more often

[Slack]

Been there, done that. In my case, it was a REALLY loose drive chain. Check it immediately, it's a dangerous condition!

Same.. lots of play. Adjusted the chain and no more noise! 

Noticed a tiny bit of wear on the outside edge of the pins like it was really slapping around in there, I better check that more often

Like once a week!!! A chain that's too loose can jump the sprocket and lock up the rear wheel.