2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 183Get this manual
1D-41 Engine Mechanical: Piston ring free end gap and piston ring end gap Measure the piston ring free end gap using vernier calipersNext, fit the piston ring squarely into the cylinder and measure the piston ring end gap using the thickness gaugeIf any of the measurements exceed the service limit, replace the piston ring with new oneSpecial tool (A): 0990020101 (Vernier calipers (115 mm, 150 mm)) Piston ring free end gap Service limit: (1st): 5.5 mm (0.22 in) Service limit: (2nd): 9.2 mm (0.36 in) Special tool (B): 0990020803 (Thickness gauge) Piston ring end gap Service limit: (1st): 0.50 mm (0.020 in) Service limit: (2nd): 0.50 mm (0.020 in)
I933H1140149-01
Measure the piston pin outside diameter at three positions using the micrometerIf any of the measurements are out of specification, replace the piston pinSpecial tool (C): 0990020205 (Micrometer (0 25 mm)) Piston pin O.DService limit: 19.980 mm (0.7866 in)