Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 116Get this manual
ELECTRICAL
3Check that the mica (insulator) between the segments is undercut to the specified depthCommutator undercut: Standard: 0.5 0.8 mm (0.02 0.03 in) Service limit: 0.2 mm (0.01 in) If the measurement exceeds the service limit, cut to the specified depthNOTE: Remove all particles of mica and metal using compressed airWear safety grasses when using compressed air
SEGMENT
MICA undercut