Zodiac Carburetor Throttle slide vacuum valve Fits: > 90-06 Bigtwin and 88-06 XL Sportster

40/44mm CV carburetor Throttle slide/Vacuum Piston Assembly Fits: > 90-06 Bigtwin and 88-06 XL Sportster

CV carburetor vacuum piston operates the needle up and down to regulate the fuel in the air stream.

Fits:
FXST 1990-UP
FLST 1990-UP
FXR 1990-1994
FLT 1990-2006
XL 1988-2006

Part numbers:
747550: Vacuum piston assembly (OEM 27585-88)