SHERCO 4-STROKE
MODEL
YEARS
PISTON PART # WÖSSNER COMPR. RATIO OEM COMPR. RATIO
PISTON SIZE
OVERSIZE
RING SET
SE 2.5 I-FR
2008-2013
8905DA
77.94
STD
TPR78.00/2
250 SEF
2008-2013
8905DB
77.95
+0.01
TPR78.00/2
13.2:1
13.2:1
250 SE F-R
2008-2013
8905DC
77.96
+0.02
TPR78.00/2
SE 2.5 I-FR
2014-2018
8959DA
75.96
STD
TPR76.00/2
250 SEF
2014-2018
8959DB
75.97
+0.01
TPR76.00/2
250 SE F-R
2014-2018
8959DC
75.98
+0.02
TPR76.00/2
13.4:1
OEM
8988DA
77.96
STD
TPR78.00/2
8988DB
77.97
+0.01
TPR78.00/2
8988DC
77.98
+0.02
TPR78.00/2
250 SC-F
2019-2022
13.2:1
13.0:1
SE 300 I-FR
2014-2018
8906DA
83.94
STD
840XDS
300 SEF
2014-2018
8906DB
83.95
+0.01
840XDS
12.85:1
12.85:1
300 SE F-R
2014-2018
8906DC
83.96
+0.02
840XDS
8991DA
83.95
STD
RIK84.00B
8991DB
83.96
+0.01
RIK84.00B
300 SC-F
2019-2022
8991DC
12.6:1
12.6:1
83.97
+0.02
RIK84.00B
220
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