This is the B53D jet needle used in the OEM Honda XR650R carburetors.  Genuine Keihin jets provide the best replacement or calibration solution for your Keihin carburetors.  Do not use an imitation, nothing substitutes for OEM quality and Keihin jetting is guaranteed to be the exact size indicated because of high manufacturing tolerances.  The B53D jet needles will fit all Keihin OEM style CVK, FCR-MX, PD, PE, PJ, PWK, and PWM carburetors.  Includes jet needle, jet needle clip, and jet needle set.

The B53D has a slightly thicker diameter than the B53E jet needle at the tip resulting in a leaner mixture from 1/8-1/4 throttle opening.