Yamaha WR450FR Owner's Service Manual page 306

ELECTRIC STARTING SYSTEM
5. Measure:
6. Measure:
ASSEMBLY
1. Install:
2. Install:
CAUTION:
Be careful not to damage the brush during
installation.
6 - 15
Brush length a
G
Out of specification → Replace the
brushes as a set.
Min. brush length
3.5 mm (0.14 in)
Brush spring force
G
Out of specification → Replace the
brush springs as a set.
Brush spring force
3.92 ~ 5.88 N
(400 ~ 600 gf, 14.1 ~ 21.2 oz)
Brush spring 1
G
Brush 2
G
Armature assembly 1
G
Install while holding down the brush
using a thin screw driver.
– +
ELEC