For some time my bike has had a mild decel pop and occasional backfire. This winter I did my valves which required I take off the carbs and reinstall them. Ever since, this condition has worsened.
When I decel, my bike does a pop pop..pop..pop BANG. At Asheville Rally, I had several ducking for cover!
The bike starts right up. The bike idles smoothly. Twist the throttle from a dead stop and it immediately takes off. No hesitation at all. Twist throttle at just about any speed and the bike responds without hesitation. So... as for as performance goes... all seems fine.
I have noticed that this only happens when I am applying zero throttle. If I add even a little bit of throttle... it seems to stop the popping right away.
What I have done so far:
1. Just resync'd carbs
2. Replaced the rubber caps that cover the sync ports. Mine were cracked some.
3. Sprayed some starter fluid around the carb boots while bike running to see if I could find a place that the RPM's changed in search of a vacuum leak. Found nothing.
I'm running stock exhaust. K&N air filters and I opened the filter covers holes a bit. But I did that 10 years ago with no ill effects. This is all in the past year and half.
So... any idears??