Honda F501 Owner's Manual page 24

3. Clean fuel sediment cup
Turn the fuel valve to the off position and remove the fuel sediment cup
and O-ring.
Wash the fuel sediment cup in solvent and dry it thoroughly. To reinstall,
first place the O-ring in the fuel valve. Then screw the fuel sediment cup
onto the fuel valve by hand and secure it with a wrench.
O-RING
FUEL SEDIMENT CUP
4. Spark plug service
Recommended spark plug: BPR5ES (NGK)
W 1 GEPR-U (ND)
To ensure proper engine operation, the spark plug must be properly gap-
ped and free of deposits.
1. Remove the spark plug cap.
m If the engine has been running, the muffler will be very hot. Be
careful not to touch the muffler.
23