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GX160 Tier 3 Engine Part Numbers
Piston  #13101-ZH8-020
Ring Set #13010-Z4K-004

GX120 Tier 3 Engine Part Numbers
posted by QMA on 1/24/08 from National Tech
Piston #13101-ZH7-020
Ring # 13010-Z4F004
Flywheel # 311-ZEO-021

Tier 3 Engines 
posted by National Tech: Dave Preston on 1/16/08
Deadline for the offset keys has been extended to 02/01/08.

You can use the new GX120 Tier 3 engine parts to interchange with the older engines.  If you use the old style flywheel you must use offset key.

You can use the new GX160 Tier 3 engine parts to interchange with the older engines.

Installation of the New Key
Photo included - click on above

posted by QMA on 01/14/08