Hello.  I've got a 2011 Boulevard S40.  The reason I'm posting is that it has an ongoing engine problem which I've been unable to resolve.  

The engine wants to die while riding the bike.  It may run fine for a period of time - anyway from a few minutes to a much a 45 minutes into a ride.  After the trouble appears I have to blip the throttle to a great extent to even keep the engine running.  If I don't do this it will die immediately.  So that's the basic nature of the problem as it occurs while riding.

I've had it up to the Suzuki dealer, as well as a neighborhood mechanic.  Both times they rebuilt the carburetor, and both time the problem came back after the motorcycle set for a period of time.  (Anywhere from 2 to 4 weeks)  I'm not really sure what would explain all of these symptoms, and so I'm writing in hopes that someone can give me some suggestions.  Please let me know if you need me to provide any more details.

Thanks in advance for any help offered  

Do you still have the stock vacuum operated (automatic) fuel petcock on the bike?

The diaphragm in the petcock can go bad, and make all kinds of running problems.  Sometimes the diaphragm gets hard and no fuel flows - sometimes they get holes and flow too much fuel.

This forum suggests that you replace the stock petcock with one from a Yamaha 660 Raptor.   It is manual and very reliable - however you will have to learn to turn it ON to ride....OFF to store.

Look at the link below - it lists the official Yamaha part number of the petcock - don't buy a Chinese copy from eBay.  If you don't see the parts number listed or the white box it comes in - don't buy it.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1366651397

Whatever "Solution  " they sold you was an exercise in ignorance. They shouldn't charge for a "Repair  " that doesn't fix the problem.
That they know so little about a bike they sell is sad. That they would charge for labor that doesn't solve the problem is something else..

Vacuum petcock... one of a handful of known problems with these bikes.

Picked up a 2003 with 18K miles for my wife. Bone stock, still had the brass plug in the carb! I've torn it apart, got a cam chain tensioner and head plug from Verslagen, and a Raptor petcock. Just ordered a jet set from Lancer, and that should take care of most of the issues for a while.

Forget the stealerships... the folks here have forgotten more about these bikes than most of the "service techs" will ever know.

There are no dumb questions! You should always come here first,we can answer with  most of the info you need to fix your problems and we don't charge you for labor,

There are more dumb answers than dumb questions .....  

Go to page one of the tech section on this site, there is an informative video on how to change the stock petcock to the Raptor 660 one.

Another Raptor to the rescue.