The engine of my 85 R80 intermittently stalls when I open the throttle to accelerate from a stop. I was able to duplicate the concern while standing beside the bike and noted a popping sound and saw a puff of smoke from the right carb.

It concerns me when it happens at a intersection when the light turns green.

I'm posting this because I'd like to understand what's happening when it stalls and why. Thanks for your input.