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2222cc kit. Black powder coated wrinkle finish cylinders with clear (highlighted) fins. Kit includes a forged 4.320" big bore piston kit, black wrinkle 4.320" big bore cylinders, 2 multi-Layer-Steel .030" head gaskets, 2 cylinder base gaskets, 4 cylinder dowels, 2 exhaust gaskets and a S&S cubic inch cam cover batch. Works with stock crankcases, case boring is not required. 4-5/8" stroker flywheels are required, these must be purchased separately as 923270 or 923271. Note: S&S measured 150.5HP and 147.5TQ with a 590 cam, CNC heads, Big Bore throttle body and a high flow Stealth air cleaner kit. Note: Fully assembled 4-5/8" stroke stroker flywheel assemblies are required for installation of this big bore kit. Available as 923270 (with balancer gear installed) or 923271 (without balancer gear). Both come with full width wrist pin connecting rods, which is required for S&S pistons. Note: S&S 576972 extra strong head bolt kit or similar must be purchased separately. Note: Tuning of fuel injection and ignition is required. Note: S&S does not advise this kit for use on any Tri-Glide or other three wheelers, including conversions, due to the lugging nature of these bikes.
S&S
New

S&S, M8 136" big bore cylinder & piston kit. Clear fins

#994437

Stock:Yes

2222cc kit. Black powder coated wrinkle finish cylinders with black (non-highlighted) fins. Kit includes a forged 4.320" big bore piston kit, black wrinkle 4.320" big bore cylinders, 2 multi-Layer-Steel .030" head gaskets, 2 cylinder base gaskets, 4 cylinder dowels, 2 exhaust gaskets and an S&S cubic inch cam cover batch. Works with stock crankcases, case boring is not required. 4-5/8" stroker flywheels are required, these must be purchased separately as 923270 or 923271. Note: S&S measured 150.5HP and 147.5TQ with a 590 cam, CNC heads, Big Bore throttle body and a high flow Stealth air cleaner kit. Note: Fully assembled 4-5/8" stroke stroker flywheel assemblies are required for installation of this big bore kit. Available as 923270 (with balancer gear installed) or 923271 (without balancer gear). Both come with full width wrist pin connecting rods, which is required for S&S pistons. Note: S&S 576972 extra strong head bolt kit or similar must be purchased separately. Note: Tuning of fuel injection and ignition is required. Note: S&S does not advise this kit for use on any Tri-Glide or other three wheelers, including conversions, due to the lugging nature of these bikes.
S&S
New

S&S, M8 136" big bore cylinder & piston kit. Black fins

#994438

Stock:No

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 Performance Piston

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

#574106

Stock:Yes

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 Performance Piston

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

#574104

Stock:No

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 Performance Piston

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

#574105

Stock:No

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 Performance Piston

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

#574107

Stock:Yes

Forged high compression Wiseco piston kit. 9.5:1 compression ration (stock is around 8:1). Includes wrist pins, circlips and Hastings rings. Note: These Wiseco pistons will fit stock style Hastings rings with 1.2mm (0.047") top & middle ringlands and a 4.75mm oil ring.
Wiseco

Wiseco, 1340cc Shovel piston kit. +.010"

#913008

Stock:Yes

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 Piston

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

#944761

Stock:Yes

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 Piston

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

#944776

Stock:No

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 Piston

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

#944807

Stock:Yes

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 Piston

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

#944817

Stock:Yes

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 Piston

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

#944823

Stock:Yes

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 Piston

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

#944657

Stock:Yes

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 Piston

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

#944774

Stock:Yes

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

KB Performance, piston set +.030

#944784

Stock:Yes

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 Piston

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

#944755

Stock:Yes

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 Piston

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

#944777

Stock:No

Forged piston set. 9.0:1 CR with 112cc head. Piston weight 416gr. Piston pin weight 97gr. Piston pin dia. .791" / offset. Head type: Dome with -52.7cc. Compression height 1.285". Bore 3.498". Stroke 4.250". Rod length 7.440". Cyl. length 5.330". 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 Piston

KB Performance, 1340 Shovel forged piston kit. +.030"

#944800

Stock:Yes

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 Piston

KB Performance, 3-5/8 big bore forged piston kit. +.030"

#944806

Stock:Yes

Forged piston set. 8.5:1 CR with 112cc head. Standard replacement. Piston weight 456gr. Piston pin weight 97gr. Piston pin dia. .791" / offset. Head type: Dome with -47.6cc. Compression height 1.450". Bore 3.437". Stroke 3.969". Rod length 7.440". Cyl. length 5.330". 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.
KB Performance Piston

KB Performance, 1200cc B.T. forged piston kit. STD

#944786

Stock:Yes