Walbro designed the WB-3A carburetor specifically for use on 2-cycle racing karts. It has become virtually standard on karts using the Yamaha KT100 or HPV engine.
This carburetor is a brand-new, unmodified unit. It comes fully assembled, including both adjustment needles and fuel inlet and outlet fittings.
Rebuilding Instructions for the Walbro WB-3A Carburetor