Brush Spring Inspection

Insert the brush (A) into the brush holder, and bring the brush into contact with the commutator, then attach a spring scale (B) to the spring (C). Measure the spring tension at the moment the spring lifts off the brush. If it is not within the standard, replace the brush holder assembly.
Spring Tension

Standard (New): 22.3-27.3 N

(2.27-2.78 kgf, 5.00-6.13 lbf)

Fig 1: Measuring Spring Tension At Moment Spring Lifts Off Brush
Courtesy of AMERICAN HONDA MOTOR CO., INC.