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Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 107" M8 engines. Works with stock 4.375" stroke and stock unmodified heads. Aftermarket 4.25" bore cylinders are required.
- 11.4:1 CR
- Piston weight: OEM
- Engine displacement: 124"
- Bore: 4.25"
- Stroke: 4.375" (stock 107" engine)
- Ring pack: 1.5mm, 1.5mm, 3.0mm
- Top land: .230
- Pin number: .9270x2.250x.180-SCR415H
- Pin type: Floating
- Pin diameter: .927"
- Compression height: 1.155"
- Crown Type: Dome
- Crown (cc): -2cc
- Alloy: Forged 4032 Alloy

KB, M8 107" to 124" big bore conversion piston kit. +.005

#993661

Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 107" M8 engines. Works with stock 4.375" stroke and stock unmodified heads. Aftermarket 4.25" bore cylinders are required.
- 11.4:1 CR
- Piston weight: OEM
- Engine displacement: 124"
- Bore: 4.25"
- Stroke: 4.375" (stock 107" engine)
- Ring pack: 1.5mm, 1.5mm, 3.0mm
- Top land: .230
- Pin number: .9270x2.250x.180-SCR415H
- Pin type: Floating
- Pin diameter: .927"
- Compression height: 1.155"
- Crown Type: Dome
- Crown (cc): -2cc
- Alloy: Forged 4032 Alloy

KB, M8 107" to 124" big bore conversion piston kit. STD

#993660

Forged Super Duty series for the Milwaukee Eight 114" and 117" engine for a 128" big bore conversion. Designed to work with both oil/water cooled engines and up to 3mm larger valves. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 114/117" M8 engines with stock 4.5" stroke. Aftermarket 4.25" bore cylinders are required. For up to 3mm larger valves.
- Compression ratio: 11.7:1
- Engine displacement: 128"
- Bore: 4.25"
- Stroke: 4.5"
- Ring Pack: 1.5mm, 1.5mm, 3.0mm
- Top land: 0.23
- Pin Number: .927x2.250x.180c-SCR415H
- Pin type: Floating
- Pin Diameter: 0.927"
- Lock: BR8894-1
- Compression height: 1.083"
- Crown type: Dome
- Crown (cc): -2.5
- Alloy: Forged 4032 alloy

KB, M8 114"/117" to 128" big bore conv. piston kit. +.005"

#993663

Forged Super Duty series for the Milwaukee Eight 114" and 117" engine for a 128" big bore conversion. Designed to work with both oil/water cooled engines and up to 3mm larger valves. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 114/117" M8 engines with stock 4.5" stroke. Aftermarket 4.25" bore cylinders are required. For up to 3mm larger valves.
- Compression ratio: 11.7:1
- Engine displacement: 128"
- Bore: 4.25"
- Stroke: 4.5"
- Ring Pack: 1.5mm, 1.5mm, 3.0mm
- Top land: 0.23
- Pin Number: .927x2.250x.180c-SCR415H
- Pin type: Floating
- Pin Diameter: 0.927"
- Lock: BR8894-1
- Compression height: 1.083"
- Crown type: Dome
- Crown (cc): -2.5
- Alloy: Forged 4032 alloy

KB, M8 114"/117" to 128" big bore conversion piston kit. STD

#993662

Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 114/117" M8 engines, cylinder must be bored to 4.125" big bore size. Case boring is not required, OEM weight so rebalancing is not required and works with stock 4.500" stroke.
10.9:1 CR. (with 88.6cc head volume).
Piston weight: OEM.
Piston pin weight 115gr., offset: 0.025".
Piston: +1.9cc/Flat top.
Compression height: 1.083".
Ring pack: 1.2mm 1.2mm 3.0mm.
Bore 4 1/8" / Stroke stock 4.500".

KB, M8 114/117 to 120" big bore conv. piston set. +.030"

#574106

Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 114/117" M8 engines, cylinder must be bored to 4.125" big bore size. Case boring is not required, OEM weight so rebalancing is not required and works with stock 4.500" stroke.
10.9:1 CR. (with 88.6cc head volume).
Piston weight: OEM.
Piston pin weight 115gr., offset: 0.025".
Piston: +1.9cc/Flat top.
Compression height: 1.083".
Ring pack: 1.2mm 1.2mm 3.0mm.
Bore 4 1/8" / Stroke stock 4.500".

KB, M8 114/117 to 120" big bore conv. piston set. +.010"

#574104

Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 114/117" M8 engines, cylinder must be bored to 4.125" big bore size. Case boring is not required, OEM weight so rebalancing is not required and works with stock 4.500" stroke.
10.9:1 CR. (with 88.6cc head volume).
Piston weight: OEM.
Piston pin weight 115gr., offset: 0.025".
Piston: +1.9cc/Flat top.
Compression height: 1.083".
Ring pack: 1.2mm 1.2mm 3.0mm.
Bore 4 1/8" / Stroke stock 4.500".

KB, M8 114/117 to 120" big bore conv. piston set. +.020"

#574105

Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove 'micro-welding'. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation, final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in, the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal.
Note: Fits 114/117" M8 engines, cylinder must be bored to 4.125" big bore size. Case boring is not required, OEM weight so rebalancing is not required and works with stock 4.500" stroke.
10.9:1 CR. (with 88.6cc head volume).
Piston weight: OEM.
Piston pin weight 115gr., offset: 0.025".
Piston: +1.9cc/Flat top.
Compression height: 1.083".
Ring pack: 1.2mm 1.2mm 3.0mm.
Bore 4 1/8" / Stroke stock 4.500".

KB, M8 114/117 to 120" big bore conv. piston set. +.040"

#574107

High compression. 883-1200 conversion piston set. Compatible with stock unmodified cylinder heads. 10:1 Compression ratio. Piston weight 335gr. Piston pin diameter .792" and weight 97gr.
Head type: Dish.
Dome +10cc.
Compression height 1.210".
Bore 3.498".
Stroke 3.812".
Rod length 6.926".
Cyl. length 4.650".
Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.

Note: Top compression ring will need additional clearance. See instructions.
Note: 1200cc cylinders must be purchased for 04-up 883 XL models. Stock cylinders liners of 04-up XL models are too thin to bore to 1200 size.

KB Performance, 883-1200 big bore piston kit. +.040"

#944618

For 96" to 103" (3 3/4" to 3 7/8") big bore conversions. Used with stock heads and cylinders. By boring the stock cylinders from 3-3/4" to 3-7/8" big bore size engine capacity will increase from 96" to 103". Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.
10.0:1 CR with 85cc head. Head type: Flat top.
+1.9cc / Compression height 1.076".
Bore 3.875" / Stroke 4.375".
Rod length 7.667".
Note: Top compression ring will need additional clearance. See instructions.

KB Performance, 96" to 103" big bore piston set. +.040"

#944761

Forged piston set. 9.5:1 CR with 80cc head.
Piston weight 365gr.
Piston pin weight 97gr.
Piston pin dia. .792" / offset.
Head type: Dome with -8.5cc.
Compression height 1.375".
Bore 3.4980".
Stroke 4.250".
Rod length 7.440".
Cyl. length 5.550".
All KB forged pistons are made from 4032 alloy, a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level, after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation, or pre-ignition, giving the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.

Note; All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with the piston set, prior to installation.

KB Performance, 1340 Evo B.T. forged piston kit. +.010"

#944776

Forged 3-5/8 big bore piston set. Used with 3-5/8" big bore cylinders with 5.330" (stock) to 5.530" (+.200") length. Must use 4-1/4" (stock) (88"), 4-1/2" (93'"), 4-5/8" (96") to 4-3/4" (98") stroker flywheels.
8.50:1 CR with 117cc head, 4.250" stroke & Std. cyl. length.
9.38:1 CR with 117cc head & 4.750" stroke & Std. cyl. length.
Piston weight 440gr.
Piston pin weight 97gr.
Piston pin dia. .791" / offset.
Head type: Dome with -42.3cc.
Compression height 1.285".
Bore 3.625".
Stroke 1.250" to 4.750".
Rod length 7.440".
Cyl. length 5.530" Std to +.200" higher.
All KB forged pistons are made from 4032 alloy, a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level, after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation, or pre-ignition, giving the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.
Please note that all KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with each piston set, prior to installation.

Note: Stock 5.330" cylinders can be used with stock 4-1/4" stroke. Longer strokes require correct length longer cylinders or stroker plates to achieve the desired compression ratio.

KB Performance, 3-5/8 big bore forged piston kit. +.040"

#944807

Forged piston set. For 96" to 103" big bore conversion.
9.5:1 CR with stock 85cc head.
Piston weight 335gr.
Piston pin weight 89gr.
Piston pin dia. .927" / offset.
Head type: Dish with +6.9cc.
Compression height 1.076".
Bore 3.875".
Stroke 4.375" (4-3/8").
Rod length 7.667".
Cyl. length 4.938".

Note: All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with each piston set, prior to installation.

KB Performance, 96" to 103" Twin Cam piston kit. +.020"

#944817

Forged big bore conversion piston set. Used for converting 96" (3-3/4" bore) and 103" (3-7/8" bore) to 110" (4" bore) big bore. With dished piston domes. Works with all stock cylinder heads, 96" and 103" with 85cc chamber and SE, MVA and CVO with 95cc chambers.
9.5:1 CR with stock 96"/103" 85cc head.
Piston weight 350gr.
Piston pin weight 89gr.
Piston pin dia. .927" / offset.
Head type: Dish with +13.3cc.
Compression height 1.086".
Bore 4.000".
Stroke 4.375" (4-3/8").
Rod length 7.667".
Cyl. length 4.938".

Note: Will not work as bolt-in with OEM H-D 4" big bore conversion cylinders in OEM 96" & 103" crankcases. The cylinders will hit a small step in the crankcase. Also clearance between piston skirt and crankcase must be checked at bottom dead center. Cases with a large cast-in bump, just below the machined area for the cylinder sleeve, must be machined for adequate piston skirt to crankcase clearance. This is on both front & rear cylinder exhaust sides of the crankcase.
Note: Will not fit 110" CVO models.
Note: All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with each piston set, prior to installation.

KB Performance, 96"/103" to 110" Twin Cam piston kit. +.030"

#944823

High compression pop-up piston set. 9.5:1 CR. Piston weight 388gr. Piston pin weight 97gr.
Head type: Dome / Dome -47cc.
Compression height 1.285" / Bore 3.4980".
Stroke 4.250".
Rod length 7.440" / Cyl. length 5.330".
Comes with T7 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.

Note: Top compression ring will need additional clearance. See instructions.
Note: Around 30% of stock 1340cc Shovel cylinders may present a problem in combination with the location of some of the oil return holes since KB pistons have a wider piston ring pack for better piston stability in the cylinder. In these cases the oil return hole must be re-located (lowered) to avoid excessive oil consumption.

KB Performance, 1340cc Shovel pop-up piston kit. +.030"

#944657

Forged piston set. 9.5:1 CR with 80cc head.
Piston weight 365gr.
Piston pin weight 97gr.
Piston pin dia. .792" / offset.
Head type: Dome with -8.5cc.
Compression height 1.375".
Bore 3.4980".
Stroke 4.250".
Rod length 7.440".
Cyl. length 5.550".
All KB forged pistons are made from 4032 alloy, a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level, after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation, or pre-ignition, giving the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.

Note; All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with the piston set, prior to installation.

KB Performance, 1340 Evo B.T. forged piston kit. STD

#944774

883-1200 conversion forged piston set. 10.1 CR with 51cc head. Works with unmodified 883 heads.
Piston weight 337gr.
Piston pin weight 97gr.
Piston pin dia. .791" / offset.
Head type: Dish with +9.8cc.
Compression height 1.280".
Bore 3.498".
Stroke 3.812".
Rod length 6.926".
Cyl. length 4.650".
All KB forged pistons are made from 4032 alloy, a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level, after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation, or pre-ignition, giving the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.
Please note that all KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with each piston set, prior to installation.

Note: For 04-up XL models 1200cc cylinders must be used. The stock 04-up 883 cylinder liners are too thin for boring to 1200 size.

KB Performance, piston set +.030

#944784

Standard compression. 883-1200 conversion piston set. Compatible with stock unmodified cylinder heads. 9:1 stock compression ratio. Pistons are flat top, .125" below deck height, to achieve a 9:1 CR with a compression height of 1.090".
Piston weight 310gr. Piston pin diameter .792" and weight 97gr.
Head type: Flat top / Dome +0.5cc.
Compression height 1.090".
Bore 3.498" / Stroke 3.812".
Rod length 6.926" / Cyl. length 4.650".
Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.

Note: Top compression ring will need additional clearance. See instructions.
Note: 1200cc cylinders must be purchased for 04-up 883 XL models. Stock cylinders liners of 04-up XL models are too thin to bore to 1200 size.

KB Performance, 883-1200 big bore piston kit. +.040"

#944755

Forged piston set. 9.5:1 CR with 80cc head.
Piston weight 365gr.
Piston pin weight 97gr.
Piston pin dia. .792" / offset.
Head type: Dome with -8.5cc.
Compression height 1.375".
Bore 3.4980".
Stroke 4.250".
Rod length 7.440".
Cyl. length 5.550".
All KB forged pistons are made from 4032 alloy, a 11% silicon alloy that is formed in a forging press. Forging aluminum gives a superior strength and structural integrity on a molecular level, after which it is fully machined. The combination of this alloy and the forging process allows the piston to flex under detonation, or pre-ignition, giving the best resistance to cracking. Although 4032 has a low expansion rate, it is higher than the cast Hypereutectic. Therefore forged KB pistons will require about .001" wider piston to wall clearance. Pistons are sold as sets, complete with wrist pin retaining rings, wrist pins and piston rings.

Note; All KB forged pistons come equipped with offset wrist pins / piston pins. There is a front and rear section on the piston and it is necessary to install it in the correct way. Please refer to the installation instructions, as provided with the piston set, prior to installation.

KB Performance, 1340 Evo B.T. forged piston kit. +.020"

#944777

High compression. 883-1200 conversion piston set. Compatible with stock unmodified cylinder heads. 10:1 Compression ratio. Piston weight 335gr. Piston pin diameter .792" and weight 97gr.
Head type: Dish.
Dome +10cc.
Compression height 1.210".
Bore 3.498".
Stroke 3.812".
Rod length 6.926".
Cyl. length 4.650".
Comes with T6 heat treated 390 Hypereutectic cast pistons with 16% silicone levels which enables running a very tight clearance for longevity and hardly any piston noise.

Note: Top compression ring will need additional clearance. See instructions.
Note: 1200cc cylinders must be purchased for 04-up 883 XL models. Stock cylinders liners of 04-up XL models are too thin to bore to 1200 size.

KB Performance, 883-1200 big bore piston kit. +.030"

#944617

Stock:No

Stock:Yes

Stock:Yes

Stock:Yes

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Stock:No

Stock:No

Stock:Yes

Stock:Yes

Stock:Yes

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Stock:Yes

Stock:Yes

Stock:Yes

Stock:Yes

Stock:Yes

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Stock:Yes