Buzz/rattle on engine rev-down

[kenmarsh]

Hey all,

I've gotten tons of help from this forum just by searching, without needing to post a new thread, but I need some help here.

The problem is: When I quickly drop the throttle, there is a disconcerting buzz/rattle from the engine area. Not really able to narrow down where. Happens when riding or when sitting in the garage.

Listen here:
https://youtu.be/b7g_X50MNpM

Bike: 2005 Suzuki gs500f
Miles: 17K miles on odometer (bike had several previous owners, has obviously had work on it before, so cannot verify)
Background: Recently adjusted valve clearances and balanced carbs. Wish I had measured the timing chain and examined the front tensioner guide while I was in there. Bike starts easily and runs strong. Compression is good.

All comments appreciated (check this, measure that...)
Thanks!

[herennow]

Look for something loose, like the tank or the exhaust, etc.

[likak25974]

True


Sent from my iPhone using Tapatalk

[michaellandreth]

Did u figure out what the issue was cause mine is about to sound just like that

[kenmarsh]

Hi,

Thanks for asking. Sound is still there. The sound seems loudest on the left front corner of the bike. It does have a cheap muffler that is loosely mounted (was tight, but daughter banged it up a bit...)

The past couple weeks the bike has been busy with me doing a full carb rebuild. Then she and BF were putting new blinkers on the front. That's all done, and just now she starts up instantly on a cool day, and no gasoline dripping while she sits.   

But the flip side is we haven't had time to debug this problem.

I'll update more as I learn more.

[Gladiator00sk]

Sorry buddy con rod bearing is done, chcek your oil\oilpan it should be full of bearing shards