1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 474Get this manual
DF4050 "K5" ('05) MODEL
BRUSH SPRING Inspect brush spring for wear, damage or other abnormal conditionsCheck the brush spring tensionReplace if necessaryBrush spring tension Standard: 15 18 (1.5 1.8 kg, 3.3 4.0 lb)