YAMAHA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
8713DA
76.96
STD
RIK77.00D
8713DB
76.97
+0.01
RIK77.00D
YZ 250 F
2008-2013
8713DC
14.1:1
13.5:1
76.98
+0.02
RIK77.00D
YZ 250 F
2014-2015
8893DA
76.95
STD
RIK77.00D
YZ 250 FX
2015-2016
8893DB
76.96
+0.01
RIK77.00D
13.7:1
13.5:1
WR 250 F
2015-2017
8893DC
76.97
+0.02
RIK77.00D
YZ 250 F
2014-2015
8894DA
76.95
STD
RIK77.00D
YZ 250 FX
2015-2016
8894DB
76.96
+0.01
RIK77.00D
14.5:1
13.5:1
WR 250 F
2015-2017
8894DC
76.97
+0.02
RIK77.00D
YZ 250 F
2016-2018
8942DA
76.95
STD
RIK77.00D
YZ 250 FX
2017-2019
8942DB
76.96
+0.01
RIK77.00D
13.7:1
13.5:1
WR 250 F
2018-2019
8942DC
76.97
+0.02
RIK77.00D
YZ 250 F
2016-2018
8946DA
76.95
STD
RIK77.00D
YZ 250 FX
2017-2019
8946DB
76.96
+0.01
RIK77.00D
14.2:1
13.5:1
WR 250 F
2018-2019
8946DC
76.97
+0.02
RIK77.00D
286
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