Yamaha EF7000 Service Manual page 141

Check if the main passages, such as the main jet
in the carburetor, are clogged.
GOOD
Check if there is air suction from the carburetor
joint, gasket, or throttle shaft.
GOOD
CLOGGED
NOT GOOD
6-6
TRBL
ENGINE
Clean the parts.
9 Tighten the carburetor
nuts securely.
9 Replace the carburetor
joint or gasket with a
new one.