Needle assembly (TC)
Check needle (9) and valve seat (c). If worn (a): replace needle. If dirty: clean.
Throttle valve (TC)
Check that the valve moves freely.
Repair or replace if stuck. Insert the throttle valve (5) into carburettor body and
make sure that it moves freely.
Taper needle (TC)
Check the taper needle (6).
If bent or worn: replace.
Standard setting: 6th groove.