Motorcycle Repair: Backfire, suzuki savage ls650, suzuki model

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I have a Suzuki Savage LS650.  Generally the bike runs fine.  When I shut down with the kill switch, I get a single loud backfire just as the engine stops turning over.  I do not think the bike had been ridden very much in the 6 months before I bought it.  Any ideas on how I can get rid of this pop?  Thanks.
Answer -
Hi Glenn,

What happens when you shut down with only the key?

Respectfully,
Mark Shively


The same single backfire happens when I shut down with only the key.  Also, when I ride downhill at highway speeds and roll off of the throttle (high RPM & closed throttle), I get an intermittent backfire.  Thanks.

Answer -
Glen,

What year is the LS? I'll research the backfiring problem.

Please use my email address: mshively1@woh.rr.com

Mark


The year is 2002.  If it matters it has about 2700 miles.
Glenn

Answer
Glenn,

Go to the below listed website link and examine part #34. This is the air cut-off diaphragm. This is designed into carbs to prevent deacceleration backfiring. Other causes may be varnishing of the fuel left in the float bowl during periods of non-starting and storage. Inspect the diaphragm for defects and clean the carburetor as necessary.

If you want my carb files, email me.

Mark

http://houseofmotorcycles.bikebandit.com/partsbandit/oem_schematic_view.asp?sche