YAMAHA 2-STROKE
MODEL
YEARS
PISTON PART #
PISTON SIZE
OVERSIZE
RING SET
STROKE
COMPRESSION HEIGHT
YZ 490
1982-1983
8266DA
86.92
STD
RSC8700
IT 490
1983-1984
8266D050
87.42
+0.50
RSC8750
82.00
40.00
8266D100
87.92
+1.00
RSC8800
8266D150
88.42
+1.50
RSC8850
8266D200
88.92
+2.00
RSC8900
YZ 490
1984-1990
8317DA
86.92
STD
RSC8700
WR 500
1992-1993
8317D050
87.42
+0.50
RSC8750
82.00
40.00
8317D100
87.92
+1.00
RSC8800
8317D150
88.42
+1.50
RSC8850
8317D200
88.92
+2.00
RSC8900
280
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