2007 Yamaha Apex Factory Service Manual, Page 236Get this manual

2007 Yamaha Apex Factory Service Manual, Page 236

CARBURETORS 8Inspect: Piston valve DamagescratcheswearReplaceS Rubber diaphragm CrackstearsReplace 9Inspect: Vacuum chamber
Pilot jet Pilot screw Needle jet Pilot air jet BendsdamagewearReplaceObstructionCleanBlow out the jets with compressed air11Inspect:
Piston valve movement Insert the piston valve into the carburetor body and move it up and downTightnessReplace the piston