Increases torque on the bottom end without removing top end power. Set up for a 2002 Cr250r (with a 07 air boot), really easy to set up for any bike, 3 points of adjustment: Metering rod for Idle, torque jet 0-50% throttle, Power jet 50-100% throttle. Removed from a running bike, Bike got sold with the OEM Carb and I have no use for this one. Will work on any 125-250cc 2 stroke bike that uses a short body carb. Shipping from outside the us, shipping can take 7-14 days after ordering. willing to ship worldwide, Dm me first.