2. Separate the back housing from the stator/rectifier assembly by removing the four screws and terminal nut from the back housing (see above).
3. Measure the length of the brushes with a caliper.

Length of generator brushes
- (1) Standard (new): 19mm
- (2) Wear limit: 5mm
4. If the length of the brushes is less than the permissible limit, replace them.

(Information obtained from this source: HondaBook.ru)
