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 (CONT)
CT-2 175 thru 77
66
172
66.0
STD
-
471M06600 2598CD
CW16
S-259
B1021
CT-3 175 thru 77
x
66.5
0.5
-
471M06650 2618CD
-
-
-
DT175 79-81
50
67.0
1.0
-
471M06700 2638CD
-
-
-
MX175 79-82
67.5
1.5
-
-
2658CD
-
-
-
YZ175 76-81
66
172
66.0
STD
-
-
2598CD
CW16
S-259
B1021
IT175 76-81
x
66.5
0.5
-
374M06650 2618CD
-
-
-
50
67.0
1.0
-
374M06700 2638CD
-
-
-
67.5
1.5
-
374M06750 2658CD
-
-
-
68.0
2.0
-
-
2677CD
-
-
-
RT180 90-98
64.5
176
64.5
STD
-
0910-2875
2539CD
CW16
S-486
-
x
0.5
-
0910-2876
2559CD
-
-
-
54
1.0
-
0910-2877
2579CD
-
-
-
IT200 84-86
66
195
66.0
STD
-
522M06600 2598CD
CW16
S-259
B1005
x
66.5
0.5
-
-
2618CD
-
-
-
57
67.0
1.0
-
522M06700 2638CD
-
-
-
67.5
1.5
-
-
2658CD
-
-
-
68.0
2.0
-
522M06800 2677CD
-
-
-
WR200 92-98 (Euro only)
66.8
199
66.8
STD
-
0910-0801
2628CD
CW16
-
-
x
67.0
0.20
-
-
2638CD
-
-
-
57
67.5
0.70
-
-
2658CD
-
-
-
68.0
1.20
-
-
2677CD
-
-
-
68.5
1.70
-
0910-0805
2697CD
-
-
-
YZ250 76-79
70
246
70.0
STD
-
234M07000 2756CD
CW18
S-343
B1003
IT250 78-80
x
70.5
0.5
-
234M07050 2776CD
-
-
-
DT250 74-79
64
71.0
1.0
-
234M07100 2795CD
-
-
-
MX250 73-75
71.5
1.5
-
-
2815CD
-
-
-
72.0
2.0
-
234M07200 2835CD
-
-
-
YZ250 80-82
70
246
70.0
STD
-
452M07000 2756CD
CW18
S-343
B1003 10
IT250 81-82
x
70.5
0.5
-
-
2776CD
-
-
B1014 11
64
70.75
0.75
-
-
2786CD
-
-
-
71.0
1.0
-
452M07100 2795CD
-
-
-
71.5
1.5
-
452M07150 2815CD
-
-
-
72.0
2.0
-
452M07200 2835CD
-
-
-
IT250 83
68
246.8
68.0
STD
-
515M06800 2677CD
CW18
S-511X
B1014
Pro-Lite
x
68.25
0.25
-
-
2687CD
-
-
-
68
68.5
0.5
-
515M06850 2697CD
-
-
-
68.75
0.75
-
-
2707CD
-
-
-
69.0
1.0
-
515M06900 2717CD
-
-
-
69.5
1.5
-
-
2736CD
-
-
-
70.0
2.0
-
515M07000 2756CD
-
-
-
YZ250 83-87
68
246.8
68.0
STD
-
560M06800 2677CD
CW18
S-511X
B1014
Pro-Lite
x
68.25
0.25
-
-
2687CD
-
-
-
*Power Valve must be modified
68
68.5
0.5
-
560M06850 2697CD
-
-
-
for .040 and larger
69.0
1.0
-
560M06900 2717CD
-
-
-
69.5
1.5
-
560M06950 2736CD
-
-
-
70.0
2.0
-
560M07000 2756CD
-
-
-
YZ250 88-91
68
246.8
68.0
STD
-
605M06800 2677CD
CW18
S-508
B1014
WR250 91
x
68.5
0.5
-
605M06850 2697CD
-
-
-
Pro-Lite
68
69.0
1.0
-
605M06900 2717CD
-
-
-
*Power Valve must be
69.5
1.5
-
605M06950 2736CD
-
-
-
modified for .040 and larger
70.0
2.0
-
605M07000 2756CD
-
-
-
*1991 model is Ceramic -
-
-
-
-
-
-
Composite Cylinder sleeving
-
-
-
-
-
-
or replating required for oversizes
-
-
-
-
-
-
YZ250 92-94
68
246.8
68.0
STD
0903-0716 677M06800 2677CD
CW18
S-508
B1014
WR250 92-94
x
68.5
0.5
0903-0717 677M06850 2697CD
-
-
-
Pro-Lite
68
69.0
1.0
-
677M06900 2717CD
-
-
-
*Ceramic Composite -
70.0
2.0
-
0910-1231
2756CD
-
-
-
Cylinder sleeving or
-
-
-
-
-
-
replating required for oversizes
-
-
-
-
-
-
YZ250 92-98
68
246.8
68.0
STD
-
0910-1233
2677CS
CW18
S-508
B1014
Racer’s Choice
x
-
-
-
-
-
-
250cc Single Ring
68
-
-
-
-
-
-
YZ250 95-98
68
246.8
68.0
STD
0903-0720 677M06800 2677CD
CW18
S-508
B1014
WR250 95-98
x
68.5
0.5
-
677M06850 2697CD
-
-
-
Pro-Lite
68
69.0
1.0
0903-0722 677M06900 2717CD
-
-
-
*Ceramic Composite -
70.0
2.0
0903-0723 0910-1231
2756CD
-
-
-
Cylinder sleeving or
-
-
-
-
-
-
replating required for oversizes
-
-
-
-
-
-
10 For IT250 81-82, YZ250 80-81.
11 For YZ250 82.
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