Join Date: Feb 2005
Location: Vancouver, British Columbia, Canada
You should not be on the throttle at all when starting. Hit the starter, when the bike starts to 'catch,' then open the throttle (instructions from my mechanic). You might be flooding it a little on startup, leading to unburnt fuel=backfire. Any old gas/moisture in the tank could be the culprit too. If the bike backfires on decceleration, it's probably the air-cut valve(s) on the carb(s).
1985 BMW K100RT..wheeee
78 GL1000, naked, restored, on to a happy new home Dec 05
previously: 76 GL1000, 82 GL1100
73 BMW R60/5; \'80s Suzuki GS400/GS750/GS850T; \'87 BMW K100RS; \'73 Kawasaki Z1