ENGINE
HIGH-PERFORMANCE PISTONS (CONT)
STOCK BORE BORE
TOP-END
X STROKE
SIZE
OVERIZE DISPLACEMENT COMPRESSION PISTON
PK KIT
RING SET
CIRCLIP WRIST PIN BEARING
FITS MODEL
(MM)
(MM)
(MM)
(CC)
RATIO
PART #
PART #
PART #
PART # PART #
PART #
HONDA (4-STROKE)
ATC 185/S 80-83
63 x 57.8
65.0
2.00
191.8
10.25:1
4362M06500
0903-0316
2559XC
CW15
S-522
-
+.080 Overbore
65.5
2.50
4156M06550
0903-0346
2579XC
*Cylinder Boring Only
66.0
3.00
4156M06600
0903-0364
2598XC
66.5
3.50
4156M06650
0903-0347
2618XC
67.0
2.00
0910-2827
0903-0501
2638XC
ATC200/ TRX200 81-85
65 x 57.8
65.0
STD
191.8
10.25:1
4362M06500
0903-0316
2559XC
CW15
S-522
-
ATC200S 81-86
65.5
0.50
4156M06550
0903-0346
2579XC
66.0
1.00
4156M06600
0903-0364
2598XC
66.5
1.50
4156M06650
0903-0347
2618XC
67.0
2.00
0910-2827
0903-0501
2638XC
ATC200/ TRX200 81-85
65 x 57.8
65.0
STD
191.8
12.0:1
4289M06500
-
2559XC
CW15
S-522
-
ATC200S 81-86
65.5
0.50
4289M06550
-
2579XC
*Race part only
66.0
1.00
4289M06600
-
2598XC
67.0
2.00
-
2638XC
ATC200X/ TRX200SX 86-88
65 x 60
65.0
STD
199
10.25:1
-
-
2559XC
CW15
S-522
-
Fat Cat 200 86-87
65.5
0.50
4394M06550
-
2579XC
66.0
1.00
-
-
2598XC
TRX250X 87-92 4-Valve
74 x 57.3
74.0
STD
246
12.0:1
4440M07400
0903-0491
2913XC
CW17
S-523
-
74.5
0.50
4440M07450
0903-0504
2933XC
75.0
1.00
4440M07500
0903-0505
2953XC
76.0
2.00
0910-2829
0903-0493
2992XC
TRX250EX 01-08
68.5 x 62.2
68.5
STD
229
10.5:1
0910-0856
0903-0629
-
CW15
-
-
69.0
0.50
0910-0857
0903-0631
-
69.5
1.00
0910-0858
0903-0632
-
TRX250 TE/TM/X Recon 02-17
68.5 x 62.2
68.5
STD
229
10:01
0910-2825
-
-
CW15
-
-
ArmorGlide skirt coated
69.0
0.50
0910-2826
-
-
69.5
1.00
0910-4153
-
-
TRX300 2WD/ 4WD 88-00
74 x 65.5
74.0
STD
282
10.25:1
4629M07400
0903-0318
2913XC
CW17
S-523
-
2-Valve
74.5
0.50
4629M07450
0903-0329
2933XC
75.0
1.00
4629M07500
0903-0321
2953XC
75.5
1.50
-
0903-0330
2973XC
76.0
2.00
-
0903-0494
2992XC
TRX300EX 92-08
74 x 65.5
74.0
STD
282
11:01
4574M07400
0903-0334
2913XC
CW17
S-523
-
4-Valve
74.5
0.50
4574M07450
0903-0348
2933XC
75.0
1.00
4574M07500
0903-0335
2953XC
75.5
1.50
0910-0377
0903-0312
2973XC
76.0
2.00
0910-0378
0903-0313
-
ATC350X/ TRX350 Foreman 85-89
81 x 68
81.0
STD
350.4
10.25:1
4393M08100
0903-0317
3189XG
CW21
S-529
-
81.5
0.50
4393M08150
0903-0328
3208XG
82.0
1.00
4393M08200
0903-0323
3228XG
ATC350X/ TRX350 Foreman 85-89
81 x 68
81.0
STD
350.4
12.0:1
-
-
3189XG
CW21
S-529
-
81.5
0.50
4396M08150
-
3208XG
82.0
1.00
4396M08200
-
3228XG
TRX350 Rancher 00-06
78.5 x 68
78.5
STD
325
8.5:1
0910-0854
0903-0633
-
CW17
-
-
79.0
0.50
0910-0855
0903-0634
-
79.5
1.00
0910-2850
0903-0635
-
TRX400EX 99-08/ TRX400X 09-14
85 x 70
85.0
STD
397
10.0:1
4606M08500
0903-0345
3347XC
CW20
-
-
85.5
0.50
0910-2830
0903-0476
86.0
1.00
4606M08600
0903-0374
3386XC
87.0
2.00
-
0903-0483
3425XC
88.0
3.00
-
0903-0484
3465XC
TRX400EX 99-08/ TRX400X 09-14
85 x 70
85.0
STD
397
11:1
4628M08500
0903-0353
3347XC
CW20
-
-
85.5
0.50
0910-2831
0903-0475
86.0
1.00
-
0903-0471
3386XC
87.0
2.00
-
0903-0473
3425XC
88.0
3.00
-
0903-0485
3465XC
TRX400EX 99-08/ TRX400X 09-14
89 x 70
89.0
4.00
440
11:1
4667M08900
0903-0354
3504XC
CW20
S553
-
Cylinder sleeving and boring required,
order PART #0931-0054 (88mm sleeve)
TRX400 Foreman 4x4 95-03
86 x 68
86.0
STD
394.9
8.2:1
4669M08600
-
3386XC
CW19
-
-
87.0
1.00
4669M08700
-
3425XC
TRX420 Rancher 07-15
86.5 x 71.5
86.5
STD
420
Stock
0910-2820
-
-
CW19
-
-
ArmorGlide skirt coated
87.0
0.50
0910-2821
-
-
* Sleeve required for 87.5-88.5mm
87.5
1.00
0910-2822
-
-
88.0
1.50
0910-2823
-
-
88.5
2.00
0910-2824
-
-
TRX450 Foreman ES/S 4x4 98-04
90 x 68
90.0
STD
432
9.5:1
0910-2833
0903-0648
3544XC
CW19
-
-
90.5
0.50
0910-2834
0903-0649
-
91.0
1.00
0910-2835
0903-0650
-
91.5
1.50
0910-2836
0903-0651
-
92.0
2.00
-
0903-0652
3622XC
TRX450R 04-05
94 x 64.8
94.0
STD
450
10.5:1
0910-0665
0903-0477
-
-
-
-
ArmorGlide skirt coated
TRX450R 04-05
94 x 64.8
94.0
STD
450
11.5:1
0910-0666
0903-0472
-
CW21
-
-
ArmorGlide skirt coated
HIGH-PERFORMANCE PISTONS continued on next page.
2017 PARTS UNLIMITED ATV/UTV