Yamaha EF7000 Service Manual page 142

Check the fuel level.
SUFFICIENT
Check if fuel has deteriorated.
GOOD
Check if the fuel tank cap is clogged.
GOOD
Check if the fuel cock is clogged.
GOOD
Check the spark plug for dirt and check the spark
plug gap.
GOOD
Check the carburetor pilot screw turn out and float
height.
GOOD
Check if there is air suction from the carburetor
joint, gasket, or throttle shaft.
GOOD
Check if the slow or main passages such as, pilot
jet and main jet, in the carburetor are clogged.
GOOD
ENGINE SPEED IS UNEVEN
INSUFFICIENT
DETERIORATED
CLOGGED
CLOGGED
DIRTY OR OUT OF
SPECIFICATION
OUT OF
SPECIFICATION
NOT GOOD
NOT GOOD
6-7
TRBL
ENGINE
Add.
Replace.
Replace.
Clean.
Clean, adjust, or replace.
Adjust or replace.
9 Tighten the carburetor
nuts securely.
9 Replace the carburetor
joint or gasket with a
new one.
Clean the parts.