ENGINE
PISTON KITS, RINGS,
WRIST PINS AND CIRCLIPS
  • All pistons are heat-treated with a T-5 hardening and tempering cycle
  • All piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster
  • Cast piston kits are gravity-cast aluminum alloy (not forged) with 18% silicone content,
  • which produces an extremely light but very strong piston
  • Forged pistons are forged from 2618 aluminum for superior strength and durability
  • Big Bore pistons increase engine’s displacement, torque, and peak horsepower
  • Forged Replica pistons are forged OE replacements
  • 0910-0976
    0910-1045
  • Replica pistons and all rings are OEM replacements
  • Kits include piston, rings, wrist pin and circlips
  • PISTON VERSIONS
    Cast Big Bore – Big bore stock compression cast piston
    Forged Replica – Forged OE stock compression piston
    Forged Big Bore – Forged OE stock compression big bore piston
    Forged Race – Unique forged GP style race piston with only one compression ring
    0910-1062
    DIAMETER PISTON
    PISTON
    RING SET
    WRIST PIN CIRCLIP
    DIAMETER PISTON
    PISTON
    RING SET
    WRIST PIN CIRCLIP
    FITS MODEL
    (MM)
    VERSION
    P ART  #
    P ART  #
    P ART  #
    P ART  #
    FITS MODEL
    (MM)
    VERSION
    P ART  #
    P ART  #
    P ART  #
    P ART  #
    COBRA
    HONDA (CONT)
    Cast Replica
    0910-4134
    -
    -
    -
    CRF250R 04-09/
    78.96
    Forged Big Bore
    0910-1943 1 0912-0307
    0913-0159 0913-0049
    Cast Replica
    0910-4135
    -
    -
    -
    CRF250X 04-17
    78.98
    Forged Big Bore
    0910-1945 1 0912-0307
    0913-0159 0913-0049
    Cast Replica
    0910-4136
    -
    -
    -
    (Big Bore)
    80.96
    Forged Big Bore
    0910-1946 1 0912-0309
    0913-0159 0913-0049
    CX 65 10-11
    Cast Replica
    0910-4139
    -
    -
    -
    (compression
    80.97
    Forged Big Bore
    0910-1947 1 0912-0309
    0913-0159 0913-0049
    Cast Replica
    0910-4140
    -
    -
    -
    13.0:1)
    80.98
    Forged Big Bore
    0910-1948 1 0912-0309
    0913-0159 0913-0049
    Cast Replica
    0910-4137
    -
    -
    -
    80.99
    Forged Big Bore
    0910-2565
    0912-0309
    0913-0159 0913-0049
    Cast Replica
    0910-4138
    -
    -
    -
    CRF250R 08-09
    77.95
    Forged Replica
    0910-1753
    0912-0213
    0913-0042 0913-0049
    GAS GAS
    (compression
    EC250 02-07
    66.34
    Cast Replica
    0910-2553
    0912-0175
    0913-0038 0913-0056
    13.0:1)
    77.97
    Forged Replica
    0910-1755
    0912-0213
    0913-0042 0913-0049
    EC300 02-17
    71.95
    Cast Replica
    0910-3186
    0912-0177
    0913-0038 0913-0056
    CRF250R 08-09
    HONDA
    (compression
    13.5:1)
    77.96
    Forged High Comp 0910-1758
    0912-0213
    0913-0042 0913-0049
    CR80R 90-02
    46.95
    Cast Replica
    0910-1023
    0912-0163
    0913-0027 0913-0048
    CRF250R 10-11
    82.96
    Forged Big Bore
    0910-2590
    0912-0310
    0913-0042 0913-0049
    CR85R/RB 03-07
    47.45
    Cast Replica
    0910-1024
    0912-0166
    0913-0027 0913-0048
    CR85R/RB 03-07
    (Big Bore)
    82.97
    Forged Big Bore
    0910-2591
    0912-0310
    0913-0042 0913-0049
    Forged Big Bore
    0910-1025
    0912-0201
    0913-0027 0913-0048
    (compression
    CR125R 90-91
    53.94
    Cast Replica
    0910-1026
    0912-0170
    0913-0019 0913-0054
    13.2:1)
    82.98
    Forged Big Bore
    0910-2592
    0912-0310
    0913-0042 0913-0049
    CR125R 92-99
    53.94
    Cast Replica
    0910-1027
    0912-0170
    0913-0019 0913-0054
    CRF250R 10-13
    76.76
    Forged Replica
    0910-1765
    -
    0913-0159 0913-0049
    CR125R 00-03
    53.94
    Cast Replica
    0910-1028
    0912-0170
    0913-0019 0913-0054
    (compression
    76.77
    Forged Replica
    0910-1766
    -
    0913-0159 0913-0049
    CR125R 04
    53.93
    Cast Replica
    0910-2034
    0912-0170
    0913-0019 0913-0054
    13.2:1)
    76.78
    Forged Replica
    0910-1767
    -
    0913-0159 0913-0049
    53.93
    Cast Race
    0910-2127
    0912-0170
    0913-0019 0913-0054
    CRF250R 10-17
    79.96
    Forged Big Bore
    0910-2039
    0912-0308
    0913-0042 0913-0049
    53.94
    Cast Replica
    0910-1029
    0912-0170
    0913-0019 0913-0054
    (Big Bore)
    79.97
    Forged Big Bore
    0910-2040
    0912-0308
    0913-0042 0913-0049
    CR125R 04-07
    (compression
    (+3mm 144cc
    13.2:1)
    79.98
    Forged Big Bore
    0910-2041
    0912-0308
    0913-0042 0913-0049
    Big Bore)
    56.95
    Forged Big Bore
    0910-2554
    0912-0172
    0913-0019 0913-0054
    CRF250R 10-12
    (Big Bore)
    (+3mm 144cc
    (compression
    Big Bore)
    56.95
    Forged Race
    -
    0912-0172
    0913-0045 0913-0054
    13.5:1)
    78.98
    Forged Big Bore
    0910-2038
    0912-0307
    0913-0159 0913-0049
    CRF150R/RB 12-17
    65.97
    Forged Replica
    0910-1041
    0912-0207
    0913-0029 0913-0061
    CRF250R 10-13
    76.76
    Forged High Comp 0910-1769
    0912-0386
    0913-0159 0913-0049
    65.98
    Forged Replica
    0910-1743
    0912-0207
    0913-0029 0913-0061
    (high
    76.77
    Forged High Comp 0910-1770
    0912-0386
    0913-0159 0913-0049
    65.99
    Forged Replica
    0910-1744
    0912-0207
    0913-0029 0913-0061
    compression,
    76.78
    Forged High Comp 0910-1771
    0912-0386
    0913-0159 0913-0049
    Forged High Comp 0910-1042
    0912-0207
    0913-0029 0913-0061
    14.1:1)
    76.79
    Forged High Comp -
    -
    0913-0159 0913-0049
    12-16 (high
    65.98
    Forged High Comp 0910-1745
    0912-0207
    0913-0029 0913-0061
    CRF250R 10-13 (high 76.76
    Forged High Comp 0910-2596 4 0912-0386
    0913-0104 -
    compression 12.2:1) 65.99
    Forged High Comp 0910-1746
    0912-0207
    0913-0029 0913-0061
    compression,
    CRF150R/RB
    67.97
    Forged Big Bore
    0910-1940 1 0912-0304
    0913-0029 0913-0061
    14.6:1)
    76.78
    Forged High Comp 0910-2598 4 0912-0386
    0913-0104 -
    Forged Big Bore
    0910-1941 1 0912-0304
    0913-0029 0913-0061
    CRF250R 14-15
    76.76
    Forged Replica
    0910-3405
    0912-0386
    -
    0913-0049
    (compression
    67.99
    Forged Big Bore
    0910-1942 1 0912-0304
    0913-0029 0913-0061
    76.77
    Forged Replica
    0910-3406
    0912-0386
    -
    0913-0049
    11.7:1)
    71.97
    Forged Big Bore
    -
    0912-0306
    0913-0030 0913-0061
    76.78
    Forged Replica
    0910-3407
    0912-0386
    -
    0913-0049
    CR250R 89-94
    66.35
    Cast Replica
    0910-1031
    0912-0175 2 0913-0038 0913-0056
    76.76
    Forged High Comp 0910-3408
    0912-0386
    -
    0913-0049
    66.35
    Cast Replica
    0910-1032
    0912-0175 2 0913-0038 0913-0056
    76.77
    Forged High Comp 0910-3409
    0912-0386
    -
    0913-0049
    CR250R 97-01
    66.35
    Cast Replica
    0910-1033
    0912-0175 2 0913-0038 0913-0056
    76.78
    Forged High Comp 0910-3410
    0912-0386
    -
    0913-0049
    CR250R 02-04
    66.35
    Cast Replica
    0910-1034
    0912-0175 2 0913-0038 0913-0056
    76.76
    Forged High Comp 0910-3411
    0912-0386
    0912-0470 0913-0049
    CR250R 05-07
    66.35
    Cast Replica
    0910-1035
    0912-0175
    0913-0038 0913-0056
    76.77
    Forged High Comp 0910-3412
    0912-0386
    0912-0470 0913-0049
    77.95
    Forged Replica
    0910-1747
    0912-0213
    0913-0042 0913-0049
    76.78
    Forged High Comp 0910-3413
    0912-0386
    0912-0470 0913-0049
    CRF250X 04-17
    77.96
    Forged Replica
    0910-1043
    0912-0213
    0913-0042 0913-0049
    CRF250R 16-17
    76.76
    Forged Replica
    0910-4083
    -
    -
    -
    (compression
    77.97
    Forged Replica
    0910-1748
    0912-0213
    0913-0042 0913-0049
    76.77
    Forged Replica
    0910-4084
    -
    -
    -
    12.9:1)
    77.98
    Forged Replica
    0910-1749
    0912-0213
    0913-0042 0913-0049
    76.78
    Forged Replica
    0910-4085
    -
    -
    -
    CRF250R 04-09,
    77.95
    Forged High Comp 0910-1750
    0912-0213
    0913-0042 0913-0049
    CRF250R 16-17
    76.76
    Forged High Comp 0910-4097
    -
    -
    -
    77.96
    Forged High Comp 0910-1044
    0912-0213
    0913-0042 0913-0049
    (high
    76.77
    Forged High Comp 0910-4098
    -
    -
    -
    77.97
    Forged High Comp 0910-1751
    0912-0213
    0913-0042 0913-0049
    compression)
    76.78
    Forged High Comp 0910-4099
    -
    -
    -
    13.4:1)
    77.98
    Forged High Comp 0910-1752
    0912-0213
    0913-0042 0913-0049
    1 Replacement Cylinder Works Big Bore pistons.
    CRF250R 04-09/
    79.96
    Forged Big Bore
    0910-1774
    0912-0308
    0913-0042 0913-0049
    2 Require two rings per piston.
    83.96
    Forged Big Bore
    0910-1776
    0912-0311
    0913-0042 0913-0049
    4 Features new T -box forgings and DLC coated wrist pins on forged pistons with highest
    (Big Bore)
    84.96
    Forged Big Bore
    0910-1777
    0912-0312
    0913-0042 0913-0049
    compression ratios for increased strength and performance.
    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