2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 171Get this manual

2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 171

Fuel System: Diaphragm and Piston Operation The carburetor is variable-venturi type, whose venturi cross sectional area is
"C" provided in the piston valve (1)Rising negative pressure overcomes the spring (3) force, causing the piston valve (1)
to rise into the diaphragm chamber and prevent the air velocity from increasingThus, air velocity in the venturi passage
is kept relatively constant for improved fuel atomization and the precise airfuel mixture2 [A] [B] I827H1170035-02 1Piston