Yamaha EF7000 Service Manual page 139

Check the fuel level.
SUFFICIENT
Check if the fuel tank cap is clogged.
GOOD
Check if the fuel cock is clogged.
GOOD
Check if the fuel hose is clogged.
GOOD
Check if there is air suction from the carburetor
joint, gasket, or throttle shaft.
GOOD
Check the compression pressure.
OUT OF
SPECIFICATION
Measure the valve clearance.
GOOD
Check if there is seizure, wear, or damage on the
piston, piston ring, or cylinder.
GOOD
Check the TCI unit air gap.
GOOD
ENGINE STARTS BUT STALLS
INSUFFICIENT
CLOGGED
CLOGGED
CLOGGED
NOT GOOD
GOOD
OUT OF
SPECIFICATION
SEIZURE OR WORN
NOT GOOD
6-4
TRBL
ENGINE
Add.
Clean or replace.
Clean.
Clean.
9 Tighten the carburetor
nuts securely.
9 Replace the carburetor
joint or gasket with a
new one.
Adjust.
Repair or replace.
Adjust.