Sym JET 4 R 50 Series Service Manual page 122

4. Fuel System
Inspection
Check the reed valve for damage and its reed
strength.
Check the reed valve seat for crack, damage and
the clearance between the seat and the valve.
Replace reed valve if necessary.
Caution
Do not bend the reed valve stopper. Otherwise,
it will cause its strength insufficient and rough
engine running. If the reed valve or its seat is
damaged, replace with a set.
Installation
Install in the reverse order of removal procedures.
Check for leaking after installed.
4-8
Reed valve
Reed valve seat
Carburetor
Reed valve stopper
Fuel hose