To prevent "afterburn" generated by a lean fuel mixture when closing the throttle, the cut-off valve temporarily closes the slow-jet air passage, creating an instantly richer mixture
Included in these high quality kits are all parts necessary for a complete rebuild (diaphram, spring and O-ring)
Made in Japan
NOTE: Product may not be legal for sale or use in California or in other localities due to state and/or federal anti-tampering laws.