Remove carburettor cover.
Remove atomizer.
Check injection spray pattern.
A = 11 + 1 mm (0.433 + 0.040").
B = 1.5 mm (0.059")
C = 10 to 15 mm (0.394 to 0.590")

Use measuring glass 7020 to check the injection rate.
Adjust the injection rate¹ at the reference bending point.
The entire pump piston must be replaced if applicable.


¹ See specifications