YAMAHA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
YZ 400 F
1998-1999
8603DA
91.95
STD
GNH92.00
WR 400 F
1998-2000
8603DB
91.96
+0.01
GNH92.00
12.5:1
12.5:1
8603DC
91.97
+0.02
GNH92.00
8603D200
93.95
+2.00
GNH94.00
YZ 426 F
2000-2002
8525DA
94.96
STD
RIK95.00
WR 426 F
2001-2002
8525DB
94.97
+0.01
RIK95.00
12.5:1
12.5:1
8525DC
94.98
+0.02
RIK95.00
YZ 450 F
2003-2004
8562DA
94.96
STD
RIK95.00/2
WR 450 F
2003-2015
8562DB
94.97
+0.01
RIK95.00/2
8562DC
94.98
+0.02
RIK95.00/2
8562D300
97.96
+3.00
980ADS-2
12.5:1
12.5:1
8570DA
94.96
STD
RIK95.00/2
8570DB
94.97
+0.01
RIK95.00/2
YZ 450 F
2003-2004
13.0:1
12.5:1
8613DA
94.95
STD
RIK95.00/2
8613DB
94.96
+0.01
RIK95.00/2
YZ 450 F
2005
8613DC
12.5:1
12.5:1
94.97
+0.02
RIK95.00/2
290
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