2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 109Get this manual
Engine Mechanical: Piston Ring-to-groove Clearance Using the thickness gauge, measure the side clearances of the 1st and 2nd piston ringsIf any of the clearances exceeds the limit, replace both piston and piston ringsSpecial tool0990020803 (Thickness gauge)0990020205 (Micrometer (0 25 mm)) Piston ring-to-groove clearance Service limit: (1st): 0.18 mm (0.0071 in) Service limit: (2nd): 0.15 mm (0.0059 in) Piston ring groove width Standard: (1st): 1.01 1.03 mm (0.0398 0.0406 in) Standard: (2nd): 1.01 1.03 mm (0.0398 0.0406 in) Standard: (Oil): 2.01 2.03 mm (0.0791 0.0799 in) Piston ring thickness Standard: (1st): 0.97 0.99 mm (0.0382 0.0390 in) Standard: (2nd): 0.97 0.99 mm (0.0382 0.0390 in)