Harley Crankcases and Parts
Harley Bike Crankcases & Parts at JJ Motorsports
Rebuild or upgrade your Harley’s bottom end with premium crankcase components from JJ Motorsports, featuring lock kits, breather filters, and precision pinion shafts for reliable performance on Big Twin, Evo, Twin Cam, and Shovelhead engines. These high-quality parts ensure proper alignment, breathing, and durability.
Shop Eastern Motorcycle Parts, EMGO, and JIMS crankcase parts for proven reliability. Explore related categories such as Harley engine for bearings and flywheels, or Harley for oil pumps and cams to complete your bottom-end rebuild.
Top Harley Crankcase & Parts
- Eastern Motorcycle Parts Crankpin Nut Lock Kit A-23966-78 – Complete lock kit for crankpin nuts; essential for flywheel assembly on Evo and Twin Cam.
- EMGO Crankcase Filter Kit 14-20910 – Breather filter kit with mounting hardware; improves crankcase ventilation on Sportster and Big Twin.
- JIMS Pinion Gear Shaft Big Twin 24006-54A – Precision pinion shaft for 1954-1999 Big Twin; heat-treated for maximum strength and perfect gear mesh.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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DRAG SPECIALTIES Crankcase Vent Replacement Filter 35-0319-BC142
DRAG SPECIALTIES
$21.58Replacement filters sold separatelyDS289519- SKU:
- DS289519
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- VENT FILTER
- TYPE:
- BOLT
- UNITS:
- EACH
- BASE COLOR:
- SILVER
- TYPE:
- BUTTON-HEAD
$21.58 -
On Sale
S&S CYCLE REED VALVE, 93-99 STD 31-2096
S&S CYCLE
MSRP: $165.95Now: $149.36Was: $165.95New-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, reeds open when pressure in the crankcase becomes greater than pressure in the cam chest, and close when pressure in the cam chest is equal to or...09200008- SKU:
- 09200008
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- COLOR/FINISH:
- SILVER
- DIAMETER - THREAD SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- BREATHER VALVE
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
- BASE COLOR:
- SILVER
MSRP: $165.95Now: $149.36Was: $165.95Qty in Cart: 0Quantity:Price:MSRP: $165.95Now: $149.36Was: $165.95Subtotal: -
On Sale
S&S CYCLE REED VALVE, 84-99 +.030 31-2100
S&S CYCLE
MSRP: $171.95Now: $154.76Was: $171.95New-style breather is not dependent on the rotation of the crankshaft to make it open and close. Instead, reeds open when pressure in the crankcase becomes greater than pressure in the cam chest, and close when pressure in the cam chest is equal to or...09200009- SKU:
- 09200009
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- BREATHER VALVE
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
- DIAMETER - THREAD SIZE IMPERIAL:
- +0.030'
- BASE COLOR:
- SILVER
MSRP: $171.95Now: $154.76Was: $171.95 -
On Sale
S&S CYCLE Engine Case - Twin Cam 310-0369
S&S CYCLE
MSRP: $2,155.95Now: $1,940.36Was: $2,155.95Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI), Feature greater overall strength than stock crankcases, Strong, dependable Timken®-style sprocket shaft bearings, Clearanced for strokes up to and including 5", All passages...09200093- SKU:
- 09200093
- Availability:
- Ships Same Business Day
- Weight:
- 35.80 LBS
- BASE COLOR:
- BLACK
- BASE FINISH:
- POWDER-COATED
- BORE SIZE IMPERIAL:
- 4.125'
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- PRODUCT NAME:
- ENGINE CASE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $2,155.95Now: $1,940.36Was: $2,155.95Qty in Cart: 0Quantity:Price:MSRP: $2,155.95Now: $1,940.36Was: $2,155.95Subtotal: -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0055
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Cast from A356 T-6 heat-treated aluminum alloy, Machined to accept an oil filter assembly that mounts on the front of stock motor cases, All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil...09200063- SKU:
- 09200063
- Availability:
- Ships Same Business Day
- Weight:
- 29.38 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK®
- PRODUCT NAME:
- ENGINE CASE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0078
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Cast from A356 T-6 heat-treated aluminum alloy, Machined to accept an oil filter assembly that mounts on the front of stock motor cases, All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil...09200064- SKU:
- 09200064
- Availability:
- Ships Same Business Day
- Weight:
- 29.00 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- ENGINE CASE
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- 3.625'
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK®
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Crankcase - Black 310-0878
S&S CYCLE
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95Stock or 4-1/8" bore crankcases to be used as a foundation for a custom engine or replacement for T111, T124, or T143, Stock looking, but stronger; thicker wall sections and superior 356-T6 aircraft grade aluminum, Tough powder coat finishes, Reinforced...09200155- SKU:
- 09200155
- Availability:
- Ships Same Business Day
- Weight:
- 35.80 LBS
- MATERIAL:
- 356 T-6 ALUMINUM
- BASE COLOR:
- BLACK
- BORE SIZE IMPERIAL:
- STANDARD
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- PRODUCT NAME:
- CRANKCASE
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- BLACK
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95 -
On Sale
S&S CYCLE Crankcase - Black 310-0856
S&S CYCLE
MSRP: $2,245.95Now: $2,021.36Was: $2,245.95Stock or 4-1/8" bore crankcases to be used as a foundation for a custom engine or replacement for T111, T124, or T143, Stock looking, but stronger; thicker wall sections and superior 356-T6 aircraft grade aluminum, Tough powder coat finishes, Reinforced...09200157- SKU:
- 09200157
- Availability:
- Ships Same Business Day
- Weight:
- 35.40 LBS
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- CRANKCASE
- MATERIAL:
- 356 T-6 ALUMINUM
- BASE FINISH:
- POWDER-COATED
- BORE SIZE IMPERIAL:
- 4.125'
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPER STOCK
- RIDING STYLE:
- STREET
- UNITS:
- EACH
MSRP: $2,245.95Now: $2,021.36Was: $2,245.95 -
On Sale
S&S CYCLE Special Application Crankcase 31-0047
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Cam chest is moved outward .250" to allow crankcases to handle large cylinder bore sizes, Relocated cam chest oil pick-up increases gear case scavenging and virtually eliminates oil carry-over at sustained high rpm, Machined to accept the stock oil...09200158- SKU:
- 09200158
- Availability:
- Ships Same Business Day
- Weight:
- 34.20 LBS
- PRODUCT NAME:
- CRANKCASE
- RIDING STYLE:
- STREET
- UNITS:
- KIT
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Crankcase - Natural 31-0008
S&S CYCLE
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95Cast from A356 T-6 heat-treated aluminum alloy, Include crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, top end oil screen spring and plug, sprocket shaft Timken®...09200124- SKU:
- 09200124
- Availability:
- Ships Same Business Day
- Weight:
- 31.40 LBS
- COLOR/FINISH:
- NATURAL
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- MODEL:
- SUPER STOCK®
- PRODUCT NAME:
- ENGINE CASE
- RIDING STYLE:
- STREET
- TYPE:
- GENERATOR
- UNITS:
- KIT
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95 -
On Sale
S&S CYCLE Crankcase - Black 31-0052
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Cast from A356 T-6 heat-treated aluminum alloy, Include crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, top end oil screen spring and plug, sprocket shaft Timken®...09200132- SKU:
- 09200132
- Availability:
- Ships Same Business Day
- Weight:
- 29.65 LBS
- BORE SIZE IMPERIAL:
- 3.500'
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPER STOCK®
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- ENGINE CASE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Breather Valve - Twin Cam 310-0742
S&S CYCLE
MSRP: $152.95Now: $137.66Was: $152.95Solves the problem of oil carryover in Twin Cam "A" motors with stock oil pump, Oil carryover is oil that comes out of your breather and all over your bike, Easy-to-install when changing cams or servicing the oil pump, Made in the U.S.A., Not for use...09200136- SKU:
- 09200136
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- BREATHER VALVE
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
MSRP: $152.95Now: $137.66Was: $152.95 -
On Sale
S&S CYCLE Magnetic Oil Drain Plug 50-8335
S&S CYCLE
MSRP: $19.95Now: $17.96Was: $19.95Made in the U.S.A.09200141- SKU:
- 09200141
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- FEATURES:
- MAGNETIC
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- DIAMETER - THREAD SIZE IMPERIAL:
- 1/2-20
- TYPE:
- OIL DRAIN
MSRP: $19.95Now: $17.96Was: $19.95 -
On Sale
S&S CYCLE Engine Case 310-0367A
S&S CYCLE
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI), Feature greater overall strength than stock crankcases, Strong, dependable Timken®-style sprocket shaft bearings, Clearanced for strokes up to and including 5", All passages...09200142- SKU:
- 09200142
- Availability:
- Ships Same Business Day
- Weight:
- 35.80 LBS
- PRODUCT NAME:
- ENGINE CASE
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- POWDER-COATED
- UNITS:
- EACH
- BASE FINISH:
- POWDER-COATED
- BORE SIZE IMPERIAL:
- 3.750'
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95 -
On Sale
S&S CYCLE Engine Case 31-0172A
S&S CYCLE
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI), Feature greater overall strength than stock crankcases, Strong, dependable Timken®-style sprocket shaft bearings, Clearanced for strokes up to and including 5", All passages...09200187- SKU:
- 09200187
- Availability:
- Ships Same Business Day
- Weight:
- 33.80 LBS
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- ENGINE CASE
- RIDING STYLE:
- STREET
- BORE SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95 -
On Sale
S&S CYCLE Engine Case 31-0181A
S&S CYCLE
MSRP: $2,155.95Now: $1,940.36Was: $2,155.95Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI), Feature greater overall strength than stock crankcases, Strong, dependable Timken®-style sprocket shaft bearings, Clearanced for strokes up to and including 5", All passages...09200188- SKU:
- 09200188
- Availability:
- Ships Same Business Day
- Weight:
- 33.30 LBS
- BASE FINISH:
- WRINKLE BLACK
- BORE SIZE IMPERIAL:
- 4.125'
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- CRANKCASE
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- UNITS:
- EACH
MSRP: $2,155.95Now: $1,940.36Was: $2,155.95 -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case - Evolution 31-0005
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Cast from A356 T-6 heat-treated aluminum alloy, Machined to accept an oil filter assembly that mounts on the front of stock motor cases, All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil...DS194301- SKU:
- DS194301
- Availability:
- Ships Same Business Day
- Weight:
- 31.75 LBS
- PRODUCT NAME:
- ENGINE CASE
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- COLOR/FINISH:
- RAW
- MODEL:
- SUPER STOCK®
- RIDING STYLE:
- STREET
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Qty in Cart: 0Quantity:Price:MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Subtotal: -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case - Evolution 31-0000
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Cast from A356 T-6 heat-treated aluminum alloy, Machined to accept an oil filter assembly that mounts on the front of stock motor cases, All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil...DS194303- SKU:
- DS194303
- Availability:
- Ships Same Business Day
- Weight:
- 31.88 LBS
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- RAW
- MODEL:
- SUPER STOCK®
- PRODUCT NAME:
- ENGINE CASE
- BORE SIZE IMPERIAL:
- 3.500'
- UNITS:
- KIT
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95 -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case - Evolution 31-0001
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Cast from A356 T-6 heat-treated aluminum alloy, Machined to accept an oil filter assembly that mounts on the front of stock motor cases, All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil...DS194304- SKU:
- DS194304
- Availability:
- Ships Same Business Day
- Weight:
- 31.38 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- COLOR/FINISH:
- RAW
- MODEL:
- SUPER STOCK®
- PRODUCT NAME:
- ENGINE CASE
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Qty in Cart: 0Quantity:Price:MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Subtotal: -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0003
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Cast from A356 T-6 heat-treated aluminum alloy, Machined to accept an oil filter assembly that mounts on the front of stock motor cases, All races are line-honed and breather cavity is precision-machined to optimize breather timing for maximum oil...DS194305- SKU:
- DS194305
- Availability:
- Ships Same Business Day
- Weight:
- 31.19 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- RAW
- MODEL:
- SUPER STOCK®
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- BORE SIZE IMPERIAL:
- 3.500'
- PRODUCT NAME:
- ENGINE CASE
- UNITS:
- KIT
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Qty in Cart: 0Quantity:Price:MSRP: $1,895.95Now: $1,706.36Was: $1,895.95Subtotal:
Buying Guide and FAQs
Buying Guide: Factors to Consider When Choosing Harley Bike Engine Crankcases and Parts
- Compatibility: Ensure crankcases and parts fit your Harley's engine type (e.g., Twin Cam, Evo, Big Twin, M8) and model (e.g., Softail, Dyna, Touring). Use the vehicle selector for year-specific matches (e.g., 1984-1999 Evo, 1999-2017 Twin Cam) to avoid assembly or fit issues.
- Type of Use: For standard rebuilds, opt for OEM-style crankcases; high-performance engines benefit from S&S V-Series for increased displacement (e.g., 100ci to 124ci) and power in demanding riding conditions.
- Components and Upgrades: Select crankcases with pre-installed bearings/seals or parts like snap rings, pinion bearings, and spacers. Upgrade to kits with high-strength materials for better oil flow and durability.
- Brand and Quality: Choose S&S Cycle for premium V-Series crankcases with forged internals or Drag Specialties for affordable bearings and spacers. Prioritize USA-made billet aluminum or steel for heat resistance and longevity.
- Installation and Cost: Crankcases require professional installation; parts like bearings are DIY-friendly. Prices range from $4.95 for snap rings to $3,295.95 for premium crankcases—factor in free shipping over $99 and expert support for value.
Frequently Asked Questions (FAQs)
- What Harley models and engines do these crankcases and parts support? Parts support models like Softail, Dyna, Touring with Evo (1984-1999), Twin Cam (1999-2017), and M8 engines—use the year/make/model filter for exact compatibility.
- How do upgraded crankcases improve performance? Designs like S&S V-Series provide increased displacement, better oil flow, and forged internals for higher horsepower and smoother operation.
- What is typically included in a crankcase kit? Kits include crankcases with pre-installed bearings/seals and hardware; parts like pinion bearings or spacers are sold separately—check details for inclusions.
- Are these parts durable for high-mileage? Yes, with high-strength materials and precision machining, they withstand high loads and extend engine life.
- What if a part doesn't fit my Harley? Verify engine type, bore size, and model before buying. Our returns policy allows exchanges or refunds if it doesn't match.
- Can I find related engine parts? Yes—explore pistons/rings, gaskets, or cams in the Harley engine category to complement your crankcase upgrade for a full rebuild.
