Parts - Engine - Top-end - Pistons

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.042 x .042 x 3mm.
Stock replacement ring set for 576555 107" to 124" big bore conversion piston kit

Wiseco, piston ring set. 4.250" big bore

#701087

Stock:Yes

Replacement for 3-3/4" bore Twin Cam models that are equipped with the 3-7/8" (3.875") Wiseco pistons used in 95" (1550cc / 4.00" stroke) and 103" (1690cc / 4-3/8" stroke)) engine with Wiseco pistons.

Wiseco, piston ring set 3.875" bore

#701345

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 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

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 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

Stock:Yes

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

Stock:Yes

Fits both standard 99-17 OEM Twin Cam and most stroker Twin Cams.
Provides an additional .150" clearance for stroked motors.
Complete kit.
Can replace OEM 22371-99 + 22307-99.
These S&S Twin Cam piston oilers are now updated to 'Dual Spray', which provides a spray pattern that cools both sides of the pistons more uniformly. They do so while using the stock amount of oil flow. Milled from Billet Aluminum 6061-T6 and shorter than stock. Less height provides an additional .150" rod clearance, perfect for those stroked motors. Includes required gaskets and hardware.
- Machined from Billet Aluminum 6061-T6
- Revised spray locations for more effective cooling
- Dual jets for uniform piston cooling
- Shorter than OEM for greater rod clearance
- Includes gaskets and hardware
- Equivalent oil flow to stock
- Replacement reference 22371-99 + 22307-99 oiler jets

S&S, Twin Cam piston cooling jet kit. 'Dual Spray'

#701030

Stock:Yes

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

Stock:Yes

Improved version and direct replacement the OEM 62700089 (front) and 62700117 (rear) oiler jets.
- Machined from Billet Aluminum 6061-T6
- Revised spray locations for more effective cooling
- Dual jets for uniform piston cooling
- Shorter than OEM for greater rod clearance
- Includes gaskets and hardware
- Equivalent oil flow to stock
- Replacement reference 62700089 and 62700117 oiler jets

S&S, piston cooling jet kit. M8

#993582

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 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 923271 (without balancer gear). Comes 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 is advised.
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, M8 136" big bore cylinder & piston kit. Black fins

#994438

Stock:No

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 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 923271 (without balancer gear). Comes 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 is advised.
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, M8 136" big bore cylinder & piston kit. Clear fins

#994437

Stock:Yes

Standard 9:1CR. Perfect for a stock rebuild. Cast type pistons are well know for their low expansion rate. They have a substantial lower price than OEM forged pistons. Kit incl. cast pistons, wirstpins, wristpin clips and Hastings piston rings.

Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.

Replacement XL883 cast piston kit. +.005"

#504555

Stock:Yes

Std cyl. bore: 3.00" (76.20mm). 1st ring: 1.5mm. 2nd ring: 1.5mm. oil ring: 2.75mm.

Tech tip: Piston grooves vs piston rings.
It's not difficult to determine if a Hastings piston ring set will fit a certain piston. You should measure the height of the piston groove in the piston itself. The 2 top grooves will be for compression rings, the lower groove will be for the oil ring. In most cases Hastings oil rings are of the low tension 3-piece flex vent type. Ring heights are listed for reference.
Tech tip: Piston oversizes.
For each oversize cylinder diameter will increase with .010" (0.254mm). The standard bore of the cylinder is listed for reference.
(Tech tip information provided by Hastings Manufacturing Company, Inc.)

Hastings, 3" bore chromoly piston ring set. +.010"

#507795

Stock:Yes

Standard 9:1CR. Perfect for a stock rebuild. Cast type pistons are well know for their low expansion rate. They have a substantial lower price than OEM forged pistons. Kit incl. cast pistons, wirstpins, wristpin clips and Hastings piston rings.

Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.

Replacement XL883 cast piston kit. +.020"

#504565

Stock:Yes

S&S, forged 3-5/8" big bore piston kit. +.060"

#531786

Stock:Yes

Replacement forged piston set. Incl. pistons, wrist pins, wristpin clips and piston rings.

Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.

S&S, 116" 4" bore piston kit. Std

#916636

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

#574107

Stock:Yes

Standard 9:1 compression ratio. Perfect for a stock rebuild. Piston includes the wristpin and wristpin clips.

Note: Piston rings must be purchased separately.
Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components, prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.

Replacement XL 900cc cast piston. +.020"

#905283

Stock:Yes