Vacuum Line to 450EXC/525EXC Street Emissions 2007

THE VACUUM LINE SHOWN IS ALLOWING A SMALL AMOUNT OF AIR FLOW TO ENTER THE INTAKE PORT, BYPASSING THE CARBURETOR. THE AIR FROM THIS HOSE WILL MAKE THE BIKE RUN LEANER AND REQUIRES THAT A BIGGER PILOT JET BE USED (#48) COMPARED TO MODELS WITH THE PORT BLOCK