Honda Hybridizing
It’s easy. If the engine is torn down, you can look at the stamp on top of the piston dome. The general part number for the Type R is “P73.” The stamping says “P73-A0,” which means that it is a U.S. piston with a compression of 10:6. The Japanese piston will say “P73-00” with a compression of 11:1. View Related Article
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