Description
Genuine Mikuni Main Jet – Hex Jet
Range in stock is #185 to #440 – please list number requested in shipping comments
Fits Mikuni VM series carburetors plus some other Mikuni’s.
Hex body and threaded area combined is .4540″ in length.
The Main Jet
When you grab a handful of throttle and rev the engine to the top 25-percent of the power band there is a significantly greater demand for fuel. In this power range, Mikuni carbs pull fuel from from the high speed circuit.
As the throttle slide is pulled up almost all the way, the jet needle protruding from the bottom of the slide clears the needle jet and opens up a direct passage from the float bowl, through the main jet, directly into the mixing chamber. On round-slide carbs, this is the most direct route for the fuel, but it requires a lot of vacuum to work. As it is with the pilot jet, it’s important that the right ratio of fuel is being delivered to the engine. The size of the jet determines how much or how little fuel reaches the mixing chamber. Mikuni offers a wide variety of main jet sizes.
