YAMAHA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
YZ 250 F
2019-2024
8957DA
76.96
STD
RIK77.00D
YZ 250 FX
2020-2024
8957DB
76.97
+0.01
RIK77.00D
14.0:1
13.8:1
WR 250 F
2020-2023
8957DC
76.98
+0.02
RIK77.00D
YZ 250 F
2019-2024
8963DA
76.96
STD
RIK77.00D
YZ 250 FX
2020-2024
8963DB
76.97
+0.01
RIK77.00D
14.2:1
13.8:1
WR 250 F
2020-2023
8963DC
76.98
+0.02
RIK77.00D
YZ 250 F
2019-2024
4095DA
76.96
STD
OEM
YZ 250 FX
2020-2024
4095DB
76.97
+0.01
OEM
WR 250 F
2020-2023
14.4:1
13.8:1
WR 250 R
2008 - 2020
WR 250 X
2008 - 2011
8729DA
11.8:1
11.8:1
76.96
STD
RIK77.00D3
TT 350
1985-1988
8502DA
85.93
STD
GNH86.00
XT 350
1985-2000
8502D050
86.43
+0.50
GNH86.50
8502D100
86.93
+1.00
GNH87.00
9.0:1
9.0:1
8502D150
87.43
+1.50
GNH87.50
8502D200
87.93
+2.00
GNH88.00
8502D250
88.43
+2.50
GNH88.50
288
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