Suzuki DF25/DF30 Four Stroke Service Manual, Page 142Get this manual
POWER UNIT 7-25 ROCKER ARMSHAFT Rocker arm and adjusting screw If the tip of adjusting screw shows excessive wear, replace the screw The arm must be replaced if its cam-riding face is badly worn Rocker arm shaft runout Using set of V-blocks, support the rocker arm shaft on surface plateMeasure runout using dial gauge09900-20602Dial gauge 09900-20701Magnetic stand 09900-21304Steel "V" block set Rocker arm shaft runout Service limit0.12 mm0.005 in If measurement exceeds service limit, replace rocker arm shaft