YAMAHA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
YZ 450 F
2020-2022
8964DA
96.96
STD
RIK97.00
YZ 450 FX
2021-2023
8964DB
96.97
+0.01
RIK97.00
13.2:1
13.0:1
WR 450 F
2021-2023
8964DC
96.98
+0.02
RIK97.00
YZ 450 F
2020-2022
4066DA
96.96
STD
RIK97.00/2
YZ 450 FX
2021-2023
4066DB
96.97
+0.01
RIK97.00/2
13.7:1
13.0:1
WR 450 F
2021-2023
4066DC
96.98
+0.02
RIK97.00/2
YZ 450 F
2020-2022
3507DA
96.96
STD
RIK97.00/2
YZ 450 FX
2021-2023
3507DB
96.97
+0.01
RIK97.00/2
WR 450 F
2021-2023
14.0:1
13.0:1
4085DA
96.96
STD
RIK97.00
4085DB
96.97
+0.01
RIK97.00
YZ 450 F
2023-2025
4085DC
13.0:1
13.0:1
96.98
+0.02
RIK97.00
4086DA
96.96
STD
RIK97.00
4086DB
96.97
+0.01
RIK97.00
YZ 450 F
2023-2025
4086DC
13.5:1
13.0:1
96.98
+0.02
RIK97.00
296
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