YAMAHA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
YZ 450 F
2005
8647DA
13.0:1
12.5:1
94.95
STD
RIK95.00/2
8630DA
94.96
STD
RIK95.00/2
8630DB
94.97
+0.01
RIK95.00/2
YZ 450 F
2006-2009
8630DC
12.5:1
12.5:1
94.98
+0.02
RIK95.00/2
8631DA
94.96
STD
RIK95.00/2
8631DB
94.97
+0.01
RIK95.00/2
YZ 450 F
2006-2009
8631DC
13.5:1
12.5:1
94.98
+0.02
RIK95.00/2
8776DA
96.96
STD
RIK97.00/2
8776DB
96.97
+0.01
RIK97.00/2
YZ 450 F
2010-2013
8776DC
12.5:1
12.5:1
96.98
+0.02
RIK97.00/2
8783DA
96.96
STD
RIK97.00/2
8783DB
96.97
+0.01
RIK97.00/2
YZ 450 F
2010-2013
13.5:1
12.5:1
292
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