2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 182Get this manual

2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 182

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Engine Mechanical:

Piston diameter Measure the piston diameter using the micrometer at 15 mm (0.6 in) "a" from the skirt endIf the piston diameter is less than the service limit, replace