2006-2009 Suzuki LT-R450 Service Manual, Page 87Get this manual
PISTON PIN AND PIN BORE Measure the piston pin bore diameter using the small bore gaugeIf the measurement is out of specifications replace the piston_ Piston pin bore 1.0 Service Limit: 19.030 mm (0.7492 in) Dial gauge (111000 mm) 09900-22403: Small bore gauge (1835 mm)
iT 09900-20602: Voh
Measure the piston pin outside diameter at three pOSitions using the micrometerIf any of the measurements are out of specificationreplace the piston pin Piston pin 0.0 Service Limit: 18.980 mm (0.7472 in) Micrometer (025 mm)