Yamaha EF3000iSE Service Manual page 114

ELECTRIC STARTING SYSTEM
6. Measure:
• Mica undercut a
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4-16
ELEC
Out of specification → Scrape the mica
to the proper measurement with a hack-
saw blade that has been grounded to fit
the commutator.
Mica undercut:
1.5 mm (0.06 in)
– +