1997-2001 Honda TRX250 Fourtrax Recon Service Manual, Page 77Get this manual
FUEL SYSTEM Remove the carburetor mounting nuts and ca rburetor
CARBURETOR OISASSEMBL V
Disco nn ect he vacuum tubes Check the vacuum ube for damageclogging and wrinkles, replace if necessary
VACUUM TUBES
Remove the air cut off va lve cover sc rews and cov er, then remove the ai cut off valve housing screws
VALVE VALVE COVER
Disassemb le the air cut off va lve Blow open each air passage in th air cut off valve with compressed air Check the iaphragm for damage, pin holes, wrinkles and bends and replace if necessary