The "idle jets" are the spring-stabilized screws at the base of the carburetor, AKA "idle mixture screws". 1/4 turn CCW will richen the mixture slightly at idle. Lean idle mixtures and/or late ignition timing has a tendency to backfire while coasting down to a stop in gear.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!