ENGINE
HIGH-PERFORMANCE PISTONS (CONT)
OVER
REPL.
BORE (MM)
DISPL. BORE
SIZES PK KIT
PISTON
REPL. RING CIRCLIPS
REPL. WRIST
TOP-END
FITS MODEL
X STROKE (MM) (CC)
SIZE (MM) (MM) PART #
PART #
SET PART # PART #
PIN PART #
BEARING PART #
YAMAHA 2-STROKE
PW50 85-87/90-15
40
49
40
STD
0903-0275 653M04000 1574CD
-
-
-
x
40.5
0.5
0903-0281 653M04050 1594CD
-
-
-
39.2
41.0
1.0
0903-0269 653M04100 1614CD
-
-
-
41.5
1.5
0903-0197 653M04150 0912-0136
-
-
-
42.0
2.0
0903-0456 0910-2871
-
-
-
-
YZ80 74-75
47
72
47.0
STD
-
222M04700 1850CS
CW12
S538
B1042
MX80 80-82
x
47.5
0.5
-
-
1869CS
-
-
-
TY80 74-75
42
48.0
1.0
-
222M04800 1890CS
-
-
-
GT1 73-75
48.5
1.5
-
-
1909CS
-
-
-
PW80 thru 06
47
72
47.0
STD
-
649M04700 1850CD
CW12
S538
B1042
BW80 thru 00
x
47.5
0.5
-
649M04750 1869CD
-
-
-
42
48.0
1.0
-
649M04800 1890CD
-
-
-
48.5
1.5
-
649M04850 1909CD
-
-
-
49.0
2.0
-
0910-1225
1929CD
-
-
-
YZ80 76-80
49
79
49.0
STD
-
-
1929CD
CW12
S538
B1042
x
50.0
1.0
-
457M05000 1969CD
-
-
-
42
50.5
1.5
-
-
1988CD
-
-
-
51.0
2.00
-
457M05100 2008CD
-
-
-
YZ80 82-83
47
79
47
STD
-
-
1850CD
CW12
S538
0924-0125
x
47.5
0.5
-
-
1869CD
-
-
-
45.6
48.0
1.0
-
477M04800 1890CD
-
-
-
48.5
1.5
-
-
1909CD
-
-
-
49.0
2.0
-
477M04900 1929CD
-
-
-
YZ80 84
48
82
48.0
STD
-
-
1890CS
CW12
S538
B1015
x
48.5
0.5
-
-
1909CS
-
-
-
45.6
49.0
1.0
-
-
1929CS
-
-
-
49.5
1.5
-
-
1949CS
-
-
-
50.0
2.0
-
508M05000 1969CS
-
-
-
YZ80 85-87
48
82
48
STD
-
520M04800 1890CS
CW12
S538
B1015
x
48.5
0.5
-
520M04850 1909CS
-
-
-
45.6
49
1.0
-
520M04900 1929CS
-
-
-
49.5
1.5
-
520M04950 1949CS
-
-
-
50
2.0
-
520M05000 1969CS
-
-
-
YZ80 88-92
48
82
48
STD
-
569M04800 1890CS
CW12
S538
B1015
x
48.5
0.5
-
569M04850 1909CS
-
-
-
45.6
49
1.0
-
569M04900 1929CS
-
-
-
49.5
1.5
-
569M04950 1949CS
-
-
-
50
2.0
-
569M05000 1969CS
-
-
-
YZ80 93-01
47
82
47.0
STD
0903-0711 646M04700 1850CS
CW14
S-517
B1012
Pro-Lite
x
47.5
0.5
0903-0712 646M04750 1869CS
-
-
-
*Ceramic Composite-Cylinder sleeving or 47.8
48.0
1.0
0903-0713 646M04800 1890CS
-
-
-
replating required for oversizes
49.0
2.0
0903-0715 0910-2868
1929CS
-
-
-
YZ80 93-01
52.5
103.5
52.5
5.5
0903-0213 0910-0366
-
CW14
S-288
B1012
Racer’s Choice Supermini
x
-
-
-
-
-
-
*Ceramic Composite-Cylinder sleeving or 47.8
-
-
-
-
-
-
replating required for oversizes
-
-
-
-
-
-
*Crankcase clearance required for 50mm
and larger bore diameter
-
-
-
-
-
-
YZ80 93-01
46
46.0
79.4
STD
-
-
-
CW14
S-517
B1012
Pro-Lite
x
-
-
-
-
-
-
International bore. Not available in the U.S. 47.8
-
-
-
-
-
-
YZ85 02-17
47.5
85
47.5
STD
0903-0299 805M04750 1869CS
CW14
S-517
B1012
Pro-Lite
x
48.0
.5
0903-0667 0910-1246
1890CS
-
-
-
*Ceramic Composite-Cylinder sleeving or 47.8
48.5
1.00
0903-0528 -
1909CS
-
-
-
replating required for oversizes
49.5
2.00
0903-0194 805M04950 1949CS
-
-
-
YZ85 02-17
52.5
103.5
52.5
5.5
0903-0271 0910-0366
-
CW14
S-288
B1012
Racer’s Choice Supermini
x
-
-
-
-
-
-
CSA Ring is Titanium Nitride coated
47.8
-
-
-
-
-
-
ArmorGlide skirt Coated
-
-
-
-
-
-
*Ceramic Composite-Cylinder sleeving or
-
-
-
-
-
-
replating required for oversizes
-
-
-
-
-
-
*Crankcase clearance required for 50mm
and larger bore diameter
-
-
-
-
-
-
LT100
52
98
52.0
STD
-
235M05200 2047CD
CW14
S-288
B1012
LT100-2/ LT100-3
x
52.5
0.5
-
-
2067CD
-
-
-
MX100
45.6
53.0
1.0
-
235M05300 2087CD
-
-
-
DT100
54.0
2.0
-
-
2126CD
-
-
-
RT100 90-00
52
97
52.0
STD
-
0910-0795
2047CD
CW14
S-288
B1012
x
52.5
0.50
-
0910-0796
2067CD
-
-
-
45.6
53.0
1.00
-
0910-0797
2087CD
-
-
-
HIGH-PERFORMANCE PISTONS continued on next page.
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.
2018 PARTS UNLIMITED OFFROAD