The idle circuit is fairly simple, yet has a dramatic effect on street manners, idle quality, emissions, and fuel mileage. Fuel enters the idle circuit through the main jet and then travels ...

Believe it or not, the majority of street miles are accomplished on the idle circuit of your carburetor!Unless you drive at max-throttle all the time, the majority of street driving is controlled ...

Idle Circuit. Carburetors are designed with two separate circuits for idle and off-idle performance venues. At idle, we need to deliver fuel to the throttle bore a different way than when we're ...

It adds more fuel into the mix to assist the idle circuit or pilot when the plunger is moved to open an additional path for that extra fuel. Once the engine is working, ...

Because the idle circuit adds fuel at every point, we also replaced the original 0.039-inch primary metering rods with a pair of 0.043 units that we had available to slightly lean the cruise ...