This upgrade package brings your BILLETRON HD300 carburetor up to HD-X specifications. It includes a chrome-plated brass slide for smoother throttle operation and increased durability, along with the Xcelerator metering rod for improved fuel response and acceleration across the throttle range.
The chrome-plated slide resists wear and reduces friction under high-load conditions, while the Xcelerator rod delivers a more refined fuel curve—enhancing both off-idle response and top-end power. This kit is a direct fit for HD300 models and requires no additional modifications.
Includes chrome-plated slide and Xcelerator metering rod only. Compatible with BILLETRON HD300 carburetors. Not intended for use with PRO-SERIES or Legacy models.