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CYCLE PRO PISTONS FOR TWIN CAM

CYCLE PRO PISTONS FOR TWIN CAM

KEITH BLACK PISTONS

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KEITH BLACK FORGED ALLOY PISTONS

KEITH BLACK FORGED ALLOY PISTONS

Keith Black is one of America's most respected Drag-Race engine designers and builders. He was the first to build 4000 plus horsepower V-8 race engines. Keith now has put all his knowledge and experience into the manufacturing of aftermarket Harley-Davidson pistons. The use of the special hypereutectic aluminum alloy, developed and race tested by Keith himself, makes a piston that is light-weight and has more features than an expensive forged piston. These features include reduced wear and decreased fuel and oil consumption. Tighter running tolerances result in an engine that runs quietly and provides more power. The low heat transfer of the hypereutectic aluminum alloy keeps the skirts cool so piston expansion is minimal. Test engines have been run with as little as 0.0005" (1/2 thousands) piston-to-wall clearance. The high ring placement reduces detonation and increases the top ring temperature. Keith Black pistons will make maximum power at 2 to 4 degrees less total timing than conventional pistons. Available in standard and over sizes for Knucklehead, Panhead, Shovelhead and Evolution Big Twin models from 1941 to present and Sportster 1200. Also available in various Big-Bore and High-compression versions as well as a Big Bore kit that will convert your 883 Sportster into a High-Torque 1200 model. Pistons are competitively priced.

Note 1:
Complete piston kits contains 2 pistons with Hastings chrome moly rings, piston pins and circlips.

Note 2:
A limited number of KB pistons have the ring grooves crossing the piston pin hole. In order to have the piston rings properly supported these pistons come with piston ring support rings. As support rings do not have a sealing function they do not have to be replaced when you install new piston rings, but sometimes new ones are needed because a ring is lost or broken.


Specifications

1941-1947 1200cc (74CI) Knucklehead Big Twin
1948-1965 1200cc (74CI) Panhead Big Twin
1966-1979 1200cc (74CI) Shovelhead Big Twin
Piston kit Replacement
8.5:1 compression Ring Set
239800
€ 278,28
231200
€ 28,86
3.437" Std.
239843
€ 240,60
231201
€ 30,29
+.005"
239801
€ 278,12
231201
€ 30,29
+.010"
239802
€ 278,12
231202
€ 28,86
+.020"
239803
€ 278,28
231203
€ 30,29
+.030"
239804
€ 278,26
231204
€ 30,29
+.040"
239805
€ 278,27
231205
€ 30,29
+.050"
239806
€ 278,12
231210
€ 23,22
+.060"
239807
€ 278,12
231211
€ 23,22
+.070"
239808
€ 240,60
231212
€ 23,22
+.080"
Note: Replacement ring set for +.005" pistons must be gapped to size
1978-1984 1340cc (80CI) Shovelhead Big Twin
Maximum oversize in OEM 1340 CC/80 CI cylinders is +.0.20". Oversizes .030" and .040" can be used in aftermarket cylinders ONLY. Check wall thickness before ordering.
Replacement Replacement
Piston kit Piston kit Ring Set with Ring Set with
7.2:1 compression 8.3:1 compression 3/16" oil rings 5/32" oil rings
239835
€ 251,85
720439
€ 246,93
231210
€ 23,22
231250
€ 26,55
3.498" Std.
239844
€ 246,93
720440
€ 246,93
231211
€ 23,22
231254
€ 21,92
+.005"
239836
€ 272,03
720440
€ 246,93
231211
€ 23,22
231251
€ 21,91
+.010"
239837
€ 285,49
720441
€ 251,89
231212
€ 23,22
231252
€ 26,54
+.020"
239838
€ 251,85
720442
€ 246,93
231213
€ 28,12
231253
€ 25,25
+.030"
239839
€ 285,63
720443
€ 246,93 € 176,05
231214
€ 28,13
744021
€ 16,24 € 12,37
+.040"
Note: Pistons produced before 2011 have 3/16" oil rings. Pistons produced after 2012 have 5/32" oil rings
+.005" rings must be gapped to size
3 5/8" Big Bore in 1948-1984 Big Twin, cleared for 4 1/4" thru 4 3/4" stroke
Piston kit Replacement
10:1 compression Ring Set
239809
€ 342,78
049017
€ 56,47
3.625" Std
239810
€ 296,31
049018
€ 40,53
+.010"
239811
€ 302,27
049019
€ 42,94
+.020"
239812
€ 296,31
049023
€ 40,53
+.030"
239813
€ 342,61
049024
€ 40,53
+.040"
Evolution Sportster 883 1986 to present
Piston kit Replacement
9:1 compression Ring Set
745400
€ 253,99
231220
€ 28,56
3.000" Std.
745401
€ 253,88
231221
€ 20,40
+.010"
745402
€ 253,88
231222
€ 22,42
+.020"
745403
€ 219,57 € 156,54
231223
€ 20,40 € 7,77
+.030"
745404
€ 219,57
- +.040"
Evolution Sportster 1200 1988 to present
Piston kit Replacement Replacement oil
9:1 compression Ring Set support ring (each)
239814
€ 232,35
231210
€ 23,22
239856
€ 4,07
3.498" Std.
239845
€ 263,47
231211
€ 23,22
239856
€ 4,07
+.005"
239815
€ 263,35
231211
€ 23,22
239856
€ 4,07
+.010"
239816
€ 250,90
231212
€ 23,22
239856
€ 4,07
+.020"
239817
€ 263,47
231213
€ 28,12
239857
€ 4,49
+.030"
239846
€ 227,78
231214
€ 28,13
239857
€ 4,49
+.040"
XR1200 2008-2010
Buell XB12 2004-2010
9.2:1 compression with 69cc heads
Piston kit
10.1:1 compression with 62cc heads Replacement Replacement oil
11:1 compression with 55cc heads Ring Set support ring (each)
745405
€ 227,78
231210
€ 23,22
239856
€ 4,07
3.498" Std.
745406
€ 263,35
231211
€ 23,22
239856
€ 4,07
+.005"
745407
€ 263,35
231211
€ 23,22
239856
€ 4,07
+.010"
745408
€ 227,78
231212
€ 23,22
239856
€ 4,07
+.020"
745409
€ 227,78
231213
€ 28,12
239857
€ 4,49
+.030"
745410
€ 227,78
231214
€ 28,13
239857
€ 4,49
+.040"
Evolution Big Twin 1984-1999
Piston kit Piston kit Replacement
8.5:1 compression 10.5:1 compression Ring Set
239819
€ 270,76
239823
€ 246,93
231210
€ 23,22
3.498" Std.
239847
€ 270,87
239848
€ 285,63
231211
€ 23,22
+.005"
239820
€ 270,76
239824
€ 285,68
231211
€ 23,22
+.010"
239821
€ 270,76
239825
€ 246,93
231212
€ 23,22
+.020"
239822
€ 270,76
239826
€ 246,93
231213
€ 28,12
+.030"
239849
€ 234,18
239850
€ 246,93
231214
€ 28,13
+.040"
Big Bore conversion kit Evolution Sportster 883 to 1200
Stock XL883 cylinders on 2009 and later models can not be bored to accept 1200cc pistons but require the separate purchase of a pair of 1986 and later XL 1200 cylinders.
Piston kit Replacement Replacement oil
9:1 compression Ring Set support ring (each)
239831
€ 285,64
231210
€ 23,22
239856
€ 4,07
3.498" Std.
239851
€ 285,49
231211
€ 23,22
239856
€ 4,07
+.005"
239832
€ 285,63
231211
€ 23,22
239856
€ 4,07
+.010"
239833
€ 285,48
231212
€ 23,22
239856
€ 4,07
+.020"
239834
€ 251,85
231213
€ 28,12
239857
€ 4,49
+.030"
239852
€ 285,48
231214
€ 28,13
239857
€ 4,49
+.040"
88CI Twin Cam 1999-2006
Piston kit Piston kit Replacement
8.8:1 compression (OEM) 10.6:1 compression Ring Set
721629
€ 333,69
721634
€ 342,61
048372
€ 55,26 € 42,07
3.750" Std.
-
721635
€ 296,31
048373
€ 73,60
+.005"
721630
€ 333,69
721636
€ 296,31
048373
€ 73,60
+.010"
721631
€ 333,53
721637
€ 296,31
048374
€ 38,64
+.020"
721632
€ 333,69
721638
€ 296,31
048375
€ 55,26 € 42,07
+.030"
Note: Rings for +.005" pistons must be gapped to size
3.875" Big Bore kits for Twin Cam 1999-2006, give 95 Cubic Inches with stock 4" stroke
Piston kit Replacement Replacement oil
9.3:1 compression Ring Set support ring (each)
721644
€ 342,61
048386
€ 29,56
240001
€ 2,16 € 1,56
3.875" Std.
721645
€ 342,61
048387
€ 28,17
240001
€ 2,16 € 1,56
+.010"
721646
€ 296,31
-
240001
€ 2,16 € 1,56
+.020"
721647
€ 296,31
048389
€ 21,10 € 16,07
240002
€ 4,41
+.030"
3.875" Big Bore kits for 2007-2017 Twin Cam, give 103 Cubic Inches with stock 4 3/8" stroke
Piston kit Replacement
10:1 compression Ring Set
724221
€ 274,29
744010
€ 51,47
3.875" Std.
724222
€ 237,26
744011
€ 38,40
+.005"
724223
€ 261,37
744012
€ 25,59
+.010"
724224
€ 274,45
744013
€ 40,26
+.020"
724225
€ 237,26
744014
€ 31,70 € 24,13
+.030"
724226
€ 237,26 € 169,15
744015
€ 25,59 € 19,48
+.040"
Replacement pins and clips for Keith Black pistons with .792" pin
239789
€ 3,18
KB Piston pin (each)
239818
€ 1,50
KB Piston circlip (each)
Replacement clips for Keith Black Twin Cam pistons and 4" bore KB pistons with .927" pin
729999
€ 1,50
KB Piston circlip (each)

Recommended Retail Prices excluding sales tax.

Prices exclude shipping, import duties and installation.