YAMAHA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
YZ 250 F
2001-2004
8572DA
76.96
STD
RIK77.00D
WR 250 F
2001-2013
8572DB
76.97
+0.01
RIK77.00D
13.3:1
12.5:1
8572DC
76.98
+0.02
RIK77.00D
8572D600
82.96
+6.00
RIK83.00A
YZ 250 F
2001-2004
8559DA
76.96
STD
RIK77.00D3
WR 250 F
2001-2013
8559DB
76.97
+0.01
RIK77.00D3
12.5:1
12.5:1
8559DC
76.98
+0.02
RIK77.00D3
8614DA
76.96
STD
RIK77.00D3
8614DB
76.97
+0.01
RIK77.00D3
YZ 250 F
2005-2007
8614DC
12.5:1
12.5:1
76.98
+0.02
RIK77.00D3
8614D200
78.96
RIK79.00D
8612DA
76.96
STD
RIK77.00D
8612DB
76.97
+0.01
RIK77.00D
YZ 250 F
2005-2007
8612DC
13.5:1
12.5:1
76.98
+0.02
RIK77.00D
8712DA
76.96
STD
RIK77.00D3
8712DB
76.97
+0.01
RIK77.00D3
YZ 250 F
2008-2013
8712DC
13.5:1
13.5:1
76.98
+0.02
RIK77.00D3
284
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