Hi Karen627;
My bike is a black one(the only one in the showroom that day). After I finished my MSF class, I went to get my MC driver license and bought the bike on the same day(impulsive behavior

). The reason that I did the 1/2 spacer is not to get rid of the back fire, but in hope of getting some more uhmm in the midrange band. It seems to starve for fuel between 60-70. I know I know, more can be done

. Since I was taking the gas tank off to do the 600 miles service, the carb is wide open to get to. So I went ahead and change all 8 Philip screws to Allen head screw(cost $5.00 including lock washer at Lowe). Cannot find any Allen head screw for those two tiny screws inside the diaphram so I order 4 OEM screws for future tinkering. I already bought 2 Sporter muffler for $35 on Ebay but still want to see how different the 1/2 spacer feel (still waiting for the tiny screws

to come-->no riding this weekend

.
SavageDude