YAMAHA 2-STROKE
MODEL
YEARS
PISTON PART #
PISTON SIZE
OVERSIZE
RING SET
STROKE
COMPRESSION HEIGHT
YZ 250
1999-2025
8216DA
66.35
STD
RSB6640
YZ 250 X
2016-2025
8216DB
66.36
+0.01
RSB6640
8216DC
66.37
+0.02
RSB6640
8216D060
66.95
+0.60
RSB6700
68.00
38.00
8216D110
67.45
+1.10
RSB6750
8216D210
68.45
+2.10
RSB6850
8216D560
71.95
+5.60
RSB7200
YZ 250
1999-2025
8217DA
66.35
STD
RSB6640
YZ 250 X
2016-2025
8217DB
66.36
+0.01
RSB6640
8217D210
68.45
+2.10
RSB6850
68.00
38.00
DT 400
1975-1978
8263D050
85.42
+0.50
RSC8550
MX 400
1975-1976
8263D100
85.92
+1.00
RSC8600
70.00
40.00
8263D150
86.42
+1.50
RSC8650
YZ 400
8264DA
84.92
STD
RSC8500
IT 400
8264D050
85.42
+0.50
RSC8550
1977-1978
70.00
40.00
8264D100
85.92
+1.00
RSC8600
8264D150
86.42
+1.50
RSC8650
8264D200
86.92
+2.00
RSC8700
YZ 465
1981-1982
8265DA
84.92
STD
RSC8500
IT 465
1980-1981
8265D050
85.42
+0.50
RSC8550
82.00
40.00
8265D100
85.92
+1.00
RSC8600
8265D150
86.42
+1.50
RSC8650
8265D200
86.92
+2.00
RSC8700
278
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