1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 267Get this manual
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STARTER SYSTEM Inspect the brushes for damage and measure the brush length SERVICE LIMIT: 5.5 mm (0.22 in) Measure brush spring tension with spring scale SERVICE LIMIT: 740 (26 oz) (1) BRUSH