2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 182Get this manual
Engine Mechanical:
Piston ring-to-groove clearance Measure the side clearances of the 1st and 2nd piston rings using the thickness gaugeIf any of the clearances exceed the limit, replace both the piston and piston ringsSpecial tool (A): 0990020803 (Thickness gauge) (B): 0990020205 (Micrometer (0 25 mm))
I933H1140146-01
"C": 2nd ring and lower side rail "D": Upper side rail "E": 1st ring and spacer
Piston ring-to-groove clearance Service limit: (1st): 0.180 mm (0.007 in) Service limit: (2nd): 0.150 mm (0.006 in) Piston ring groove width "a": Standard: (1st): 0.78 0.80 mm (0.0307 0.0315 in) "b": Standard: (1st): 1.30 1.32 mm (0.0512 0.0520 in) Standard: (2nd): 0.81 0.83 mm (0.0319 0.0327 in) Standard: (Oil): 2.01 2.03 mm (0.0791 0.0799 in) Piston ring thickness Standard: (1st):0.71 0.76 mm (0.0280 0.0299) Standard: (1st):1.08 1.10 mm (0.0425 0.0433) Standard: (2nd): 0.77 0.79 mm (0.0303 0.0311 in)