ENGINE
HIGH-PERFORMANCE PISTONS (CONT)
BORE (MM)
BORE OVER
WISECO
REPL.
REPL.
TOP-END
X STROKE
DISPL. SIZE
SIZES
PK KIT
PISTON
REPL. RING CIRCLIPS
WRIST PIN
BEARING
FITS MODEL
(MM)
(CC)
(MM) (MM)
PART #
PART #
SET PART # PART #
PART #
PART #
YZ250F 08-11
77
250
77.0
STD
-
0910-2952
-
CW16
-
-
RACER’S CHOICE SERIES
x
14:1 High Compression
53.6
Titanium Nitride Rings
ArmorGlide skirt coated
YZ250F 12-13
77
-
77
STD
0903-1146 -
-
-
-
-
x
53.6
YZ250F 12-13
77
-
77
0903-1147 -
-
-
14:1 Stock Compression
x
53.6
YZ250F 14-15
77
-
77
STD
0903-1143 -
0912-0140
CW16
-
-
YZ250FX 15-16
x
WR250F 15-17
53.6
13.5:1 Stock Compression
Nikasil bore
YZ250F 14-15
77
-
77
-
-
0910-3917
-
CW16
YZ250FX 15-16
x
WR250F 15-17
53.6
14:1 High Compression
YZ250F 14-15
77
-
77
-
-
0910-3968
-
CW16
x
WR250F 15-17
53.6
Racer’s Choice
14:1 High Compression
86
346
86.0
STD
-
0910-2916
3386XC
CW19
-
-
XT350 85-00
x
87
1.0
-
0910-1661
3425XC
9:1 Compression
59.6
1.5
-
0910-2917
-
Cylinder boring and replating required for oversizes
92
399
92.0
STD
-
4649M09200 -
CW18
-
-
WR400F 98-00
x
12.5:1 Compression
60.1
-8cc Dome Volume
YZ400F 98-99
92
399
92.0
STD
-
4650M09200 -
CW18
-
-
x
13.5:1 Compression -6.7cc Dome Volume
60.1
YZ426F 00-02
95
426
95.0
STD
-
4693M09500 -
CW19
-
-
WR426F 01-02
x
97.0
2.00
-
0910-2918
-
60.1
95
426
95.0
STD
-
0910-2919
-
CW19
-
-
WR426F 01-02
x
97.0
2.00
-
0910-2920
-
13.5:1 High Compression
60.1
YZ450F 03-05
95
449
95.0
STD
0903-0563 0910-0373
-
CW18
-
-
x
97.0
2.00
-
0910-0374
-
12.5:1 Standard Compression.
63
Nikasil Bore.
Cylinder sleeving or replating required for oversizes
95
449
95.0
STD
0903-0565 0910-0375
-
CW18
-
-
WR450F 03-06
x
97.0
2.00
-
-
13.5:1 Hi-Compression.
63.4
Nikasil Bore.
Cylinder sleeving or replating required for oversizes.
ArmorGlide skirt coated
95
449
95.0
STD
0903-0564 0910-0373
-
CW18
-
-
WR450F 07-15
x
97.0
2.00
0910-0374
-
12.5:1 Standard Compression.
63
Nikasil Bore.
ArmorGlide skirt coated
YZ450F 06-09
95
449
95.0
STD
0903-0566 0910-0375
-
CW18
-
-
WR450F 07-15
x
63.4
Nikasil Bore.
ArmorGlide skirt coated
YZ450F 10-13
97
449
97
STD
-
0910-2884
-
CW18
-
-
x
60.8
YZ450F 10-13
97
449
97
STD
-
0910-2885
-
CW18
-
-
13.5:1 High Compression
x
Nikasil Bore-ArmorGlide skirt coated
60.8
DISCLAIMER: NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES.
SEE PAGE 4 FOR IMPORTANT EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND WARRANTY INFORMATION.
2017 PARTS UNLIMITED OFFROAD