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=== W-series Piston and Piston Pin Differences === In the W-series motors, the piston and piston pin have been changed to a full-floating type, with two snap rings to locate the piston pin. The piston pin outer diameter has also been decreased. The modified piston can be identified by a 'W' mark on the piston skirt (see image below). NOTE: A "W" piston requires a modified connecting rod, wrist pin, and piston rings. https://dev.z31library.com/xenonzcar_archive/z31/images/Raredare1/Wserieschanges2.jpg
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