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JE's single piston for the Yamaha R1 is specified at 13.8:1 and intended as a direct-replacement piston for rebuilds and repairs on R1 engines. Supplied individually, this piston matches the R1 compression specification from the source description and gives technicians and owners a straightforward replacement when addressing piston wear or engine servicing needs.
JE Pistons Yamaha R1 13.8 to 1 Piston Single
