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KEIHIN — Main Jet 240 (Manufacturer Part Number: N424-27240)
KEIHIN main jet size 240, designed for carburetors to regulate fuel flow in the main opening range. An essential tuning part for anyone working on carburation: replacement of a worn jet, adjustment following engine modifications, or fine-tuning the air/fuel mixture during specific configurations.
Function: controls fuel flow at wide open throttle, influences richness at high RPMs.
Usage: replacement, maintenance, carburation tuning, and optimization of engine behavior (no guarantee of specific performance).
Practical advice: clean the jet well and check the condition of other jets and the needle before replacement.
Before installation, check compatibility with your carburetor by consulting the manufacturer's documentation or the reference already installed. The main jet is a fine tuning part: a change in size directly affects the richness of the mixture, so consider performing gradual tests and spark plug checks to validate the adjustment.
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