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 35-0313-BC104
DRAG SPECIALTIES
$21.15A properly functioning crankcase ventilation system is essential for engine longevity and reliable performance. This DRAG SPECIALTIES replacement filter prevents oil vapor and contaminants from entering your intake manifold, protecting critical engine...DS289517- SKU:
- DS289517
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- COLOR/FINISH:
- ALUMINUM
- BASE COLOR:
- BLACK
- BASE COLOR:
- SILVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- VENT FILTER
- TYPE:
- RUBBER TOP
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
$21.15 -
DRAG SPECIALTIES Crankcase Vent Replacement Filter 35-0319-BC142
DRAG SPECIALTIES
$22.21A clogged crankcase vent filter forces your engine to work harder, increasing pressure buildup and risking oil leaks, seal degradation, and performance loss. This DRAG SPECIALTIES replacement filter maintains optimal crankcase ventilation, protecting...DS289519- 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
$22.21 -
On Sale
S&S CYCLE REED VALVE, 93-99 STD 31-2096
S&S CYCLE
MSRP: $165.95Now: $149.36Was: $165.95High-RPM oil carryover kills engine efficiency and creates maintenance headaches—especially in modified or hard-driven engines with marginal ring seal. The S&S Cycle reed valve solves this problem with pressure-responsive technology that works...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: $165.95 -
On Sale
S&S CYCLE REED VALVE, 84-99 +.030 31-2100
S&S CYCLE
MSRP: $171.95Now: $154.76Was: $171.95If you're running a high-rpm engine with marginal piston ring seal, oil carryover into your cam chest is costing you performance and creating maintenance headaches. The S&S Cycle reed valve solves this problem by automatically compensating for air mass...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: $2,155.95If you're building a high-displacement Twin Cam engine or pushing your H-D beyond stock limits, OEM crankcases will become your limiting factor. S&S Cycle's replacement engine cases deliver the structural integrity and internal clearances you need to...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: $2,155.95 -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0055
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95A proper engine case is the foundation of any reliable high-performance build, and the S&S Cycle Super Stock case delivers the precision machining and OEM-quality construction that serious builders demand. This A356 T-6 aluminum casting is line-honed,...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: $1,995.95If you're building a high-performance Harley engine, your crankcase is the foundation of everything. The S&S Cycle Super Stock Engine Case gives you a precision-machined platform that optimizes oil flow, scavenging, and cooling—critical factors that...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: $2,195.95If you're building a high-performance engine or replacing a worn crankcase on a Harley-Davidson big twin, the S&S CYCLE Crankcase gives you the strength and precision you need without compromising the classic look of your machine. Built from 356-T6...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: $2,245.95Building a high-performance Harley-Davidson engine demands a foundation that can handle extreme compression, aggressive cams, and extended stroke lengths without compromise. The S&S CYCLE Crankcase combines stock aesthetics with aircraft-grade...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: $1,995.95If you're building a big-displacement Harley engine with serious cylinder bore sizes, stock crankcases simply won't cut it. The S&S Special Application Crankcase relocates critical internal passages to handle the demands of large-bore, high-RPM...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: $2,195.95A quality crankcase is the foundation of a reliable, high-performance engine—it houses your bearings, manages oil delivery, and sets the standard for longevity. The S&S Cycle crankcase delivers precision engineering with A356 T-6 aluminum construction...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: $1,995.95A quality crankcase is the foundation of any reliable Harley-Davidson engine build. The S&S Cycle crankcase delivers precision-machined construction with optimized oil scavenging and proven Timken bearing assemblies, giving you the durability and...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: $152.95Oil carryover from your breather is more than just a mess—it's a sign your crankcase ventilation can't keep pace with your Twin Cam engine. The S&S CYCLE Breather Valve eliminates this problem at the source, allowing your stock oil pump to breathe...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: $19.95Engine debris and ferrous particles circulate through your oil system every time you start your bike—they're inevitable byproducts of normal wear. A magnetic drain plug captures these contaminants before they can cause premature bearing wear or...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: $2,195.95If you're building a high-performance Twin Cam engine and need a foundation that won't compromise reliability, S&S Cycle's replacement engine cases deliver the strength and precision you demand. These cases are engineered to handle aggressive cam...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: $2,195.95Qty in Cart: 0Quantity:Price:MSRP: $2,195.95Now: $1,976.36Was: $2,195.95Subtotal: -
On Sale
S&S CYCLE Engine Case 31-0172A
S&S CYCLE
MSRP: $2,195.95Now: $1,976.36Was: $2,195.95If you're pushing your Twin Cam past stock limits, your factory cases are holding you back. S&S Cycle engine cases deliver the structural integrity you need for higher-displacement builds, stronger bearing support, and reliable operation at elevated...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: $2,195.95Qty in Cart: 0Quantity:Price:MSRP: $2,195.95Now: $1,976.36Was: $2,195.95Subtotal: -
On Sale
S&S CYCLE Engine Case 31-0181A
S&S CYCLE
MSRP: $2,155.95Now: $1,940.36Was: $2,155.95If you're building a high-performance Twin Cam engine and need cases that can handle increased displacement and aggressive cam profiles, S&S Cycle's 31-0181A offers the strength and clearance you demand. These CNC-ported replacement cases eliminate weak...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: $1,895.95The foundation of any high-performance Evolution engine starts with a quality case, and the S&S Cycle Super Stock case delivers the precision engineering required for reliability under sustained load. This A356 T-6 aluminum casting is machined to...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: $1,895.95 -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case - Evolution 31-0000
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95A quality engine case is the foundation of any reliable high-performance build. The S&S Cycle Super Stock case combines precision engineering with comprehensive hardware inclusion, eliminating the guesswork of sourcing individual components...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: $1,995.95The S&S Cycle Super Stock Engine Case is built for builders and racers who demand precision-engineered components that deliver consistent performance without compromise. This A356 T-6 aluminum casting provides the structural foundation for high-output...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: $1,995.95
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.
