Suzuki DF25/DF30 Four Stroke Service Manual, Page 146Get this manual

Suzuki DF25/DF30 Four Stroke Service Manual, Page 146

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POWER UNIT 7-29 Valve seat contact width Measure valve seat contact width as follows: (1) Remove all carbon from valve and seat(2) Coat valve seat evenly with Prussian blue (orequivalent) (3) Install