Nice to hear from you,

The Varijet carburator are reliable and easy to use without fiddling with idling of the engine. It is the main needle who are regulate the mixture from full trottle to idle cause the barrel are moving sideways. Inside the carburator has a very small hole to give extra air while the engine are in idle (C in pic). The engine will run with total closed barrel, barrel has small 2 groove to give air passed though the carburator (B in pic).