HONDA 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
CRF 250 R
2004-2005
8590DA
77.95
STD
TPR78.00
CRF 250 X
2004-2017
8590DB
77.96
+0.01
TPR78.00
13.9:1
12.9:1
8590DC
77.97
+0.02
TPR78.00
CRF 250 R
2006-2009
8656DA
77.96
STD
TPR78.00
CRF 250 X
2004-2017
8656DB
77.97
+0.01
TPR78.00
13.5:1
12.9:1
8656DC
77.98
+0.02
TPR78.00
8775DA
14.2:1
76.76
STD
RIK76.80
8775DB
76.77
+0.01
RIK76.80
CRF 250 R
2010-2013
8775DC
13.2:1
76.78
+0.02
RIK76.80
8775D220
14.97:1
78.96
+2.20
RIK79.00
8912DA
76.76
STD
RIK76.80
8912DB
76.77
+0.01
RIK76.80
CRF 250 R
2014-2015
8912DC
14.5:1
13.5:1
76.78
+0.02
RIK76.80
8938DA
76.75
STD
RIK76.80
8938DB
76.76
+0.01
RIK76.80
CRF 250 R
2016-2017
14.8:1
13.5:1
74
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