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
-
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0003
S&S CYCLE
MSRP: $1,895.95Now: $1,706.36Was: $1,895.95A quality engine case is the foundation of any reliable high-performance build, and the S&S Cycle Super Stock case delivers the precision machining and durability you need for sustained power output. This A356 T-6 aluminum casting is engineered for...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: $1,895.95 -
On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0004
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95The S&S Cycle Super Stock Engine Case is engineered for builders who demand precision and reliability in high-performance applications. This A356 T-6 aluminum casting delivers the durability required for forced induction and extended engine operation,...DS194306- SKU:
- DS194306
- Availability:
- Ships Same Business Day
- Weight:
- 30.81 LBS
- BORE SIZE IMPERIAL:
- 3.625'
- UNITS:
- KIT
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- COLOR/FINISH:
- RAW
- MODEL:
- SUPER STOCK®
- PRODUCT NAME:
- ENGINE CASE
- RIDING STYLE:
- STREET
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95 -
On Sale
S&S CYCLE Super Stock Motor Case 31-0010
S&S CYCLE
MSRP: $2,195.95Now: $1,937.66Was: $2,195.95The S&S Cycle Super Stock Motor Case is the foundation of a reliable, high-output Harley engine build. This A356 T-6 aluminum casting delivers the precision machining and bearing support you need for consistent performance, whether you're assembling a...310010- SKU:
- 310010
- Availability:
- Ships Same Business Day
- Weight:
- 33.30 LBS
- TYPE:
- GENERATOR
- UNITS:
- KIT
- MODEL:
- SUPER STOCK®
- PRODUCT NAME:
- ENGINE CASE
- RIDING STYLE:
- STREET
- MATERIAL:
- A356 T-6 ALUMINUM ALLOY
- COLOR/FINISH:
- NATURAL
MSRP: $2,195.95Now: $1,937.66Was: $2,195.95 -
EASTERN MOTORCYCLE PARTS Flywheel Thrust Washer Set - 11 pack A-24100-SET
EASTERN MOTORCYCLE PARTS
$68.95Flywheel end-play is critical to engine longevity—too much clearance causes damaging crankshaft movement, while too little creates binding that murders bearing life. This 11-piece thrust washer assortment eliminates guesswork during engine assembly and...DS194056- SKU:
- DS194056
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- THRUST
- UNITS:
- SET OF 11
$68.95 -
Jims Right-Side Crankcase Bushing 1940-1947 Knucklehead FL 24599-40
JIMS
$155.60Proper crankcase oiling is fundamental to Knucklehead longevity, and a worn or inadequate bushing compromises oil delivery to critical bearing surfaces. The JIMS Right-Side Crankcase Bushing restores full 360° lubrication flow, reducing wear on your...DS194090- SKU:
- DS194090
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- PRODUCT NAME:
- BUSHING
- FEATURES:
- STANDARD SIZE
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
$155.60 -
Jims Sprocket Shaft 1936-1947 Harley-Davidson EL FL 24001-30
JIMS
$106.75Your 1936-1947 Harley-Davidson EL or FL's sprocket shaft endures constant stress from engine torque and drivetrain loads—worn or damaged shafts compromise power delivery and reliability. The JIMS Sprocket Shaft is precision-engineered to restore proper...DS194080- SKU:
- DS194080
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- SHAFT
- TYPE:
- MOTOR SPROCKET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- SPROCKET
$106.75 -
Jims Crankcase Bushing for Harley-Davidson FL 1958-1964 24599-58B
JIMS
$135.30A worn or inadequate crankcase bushing directly compromises oil delivery to critical engine components, leading to increased wear and reduced engine life. The JIMS 24599-58B restores full 360° oiling circulation, ensuring consistent lubrication under...DS194100- SKU:
- DS194100
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- FEATURES:
- STANDARD SIZE
- UNITS:
- EACH
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
$135.30Qty in Cart: 0Quantity:Price:$135.30Subtotal: -
Jims Rod Race Set for 1941-1999 Harley-Davidson Big Twin 1046-36A
JIMS
$121.75If you're running a big twin through serious rpm or racing conditions, stock rod bearings become your weak point—premature wear, loss of power delivery, and catastrophic failure risk. The JIMS Rod Race Set replaces that vulnerability with aerospace-grade...DS194014- SKU:
- DS194014
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- COLOR/FINISH:
- COPPER
- UNITS:
- SET
- BASE COLOR:
- COPPER
- PRODUCT NAME:
- ROD RACE SET
- RIDING STYLE:
- STREET
$121.75Qty in Cart: 0Quantity:Price:$121.75Subtotal: -
Jims Sprocket Shaft for Harley-Davidson FL 1956-1964 24001-56
JIMS
$157.85If you're running a classic Harley-Davidson FL from the mid-century era, a worn or damaged sprocket shaft will compromise power transfer and invite premature drivetrain wear. The JIMS Sprocket Shaft restores precise engagement between your primary and...DS194073- SKU:
- DS194073
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- TYPE:
- SPROCKET
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHAFT
- TYPE:
- MOTOR SPROCKET
$157.85Qty in Cart: 0Quantity:Price:$157.85Subtotal: -
Jims Right-Side Crankcase Bushing for 1995-1998 Harley-Davidson Dyna Convertible FXDS-CONV 24600-58B
JIMS
$160.10A failing crankcase bushing accelerates wear on your engine's most critical moving parts and compromises oil circulation—exactly what you don't want in a high-mileage Dyna. The JIMS 24600-58B restores proper lubrication and clearances, giving you the...DS197067- SKU:
- DS197067
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- FEATURES:
- SIZE IS +.002'
- PRODUCT NAME:
- BUSHING
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
$160.10Qty in Cart: 0Quantity:Price:$160.10Subtotal: -
Jims 1990-1992 Harley-Davidson Softail Standard FXST Gear-Side Pinion Shaft Nut 24022-90
JIMS
$33.95The gear-side pinion shaft nut is a critical fastener that bears constant rotational stress in your primary drivetrain. A worn or damaged nut compromises the integrity of your entire final-drive assembly, leading to play, noise, and potential...DS198838- SKU:
- DS198838
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- PINION SHAFT
- DIAMETER - THREAD SIZE IMPERIAL:
- 5/8-24
- PRODUCT NAME:
- NUT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$33.95Qty in Cart: 0Quantity:Price:$33.95Subtotal: -
Jims Gear-Side Pinion Shaft Nut for 1984-1989 Harley-Davidson Softail Custom FXSTC 24023-54
JIMS
$22.55The gear-side pinion shaft nut is a critical fastener that bears substantial rotational forces in your primary drivetrain. A secure, properly-seated nut prevents gear slippage and drivetrain damage under load—especially important if you've upgraded to...DS198839- SKU:
- DS198839
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- TYPE:
- PINION SHAFT
- DIAMETER - THREAD SIZE IMPERIAL:
- 5/8-24
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- PRODUCT NAME:
- NUT
$22.55Qty in Cart: 0Quantity:Price:$22.55Subtotal: -
EASTERN MOTORCYCLE PARTS Bearing Spacers - 5 pack A-9131
EASTERN MOTORCYCLE PARTS
$15.50Bearing spacers are critical wear items that directly impact wheel bearing preload and suspension geometry. Worn or damaged spacers compromise handling precision and accelerate bearing degradation, making timely replacement essential for maintaining...09200079- SKU:
- 09200079
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE FINISH:
- CHROME
- PRODUCT NAME:
- BEARING SPACER
- UNITS:
- 5 PACK
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- DIAMETER - THREAD SIZE IMPERIAL:
- 0.1135' - 0.1145'
$15.50 -
DRAG SPECIALTIES Crankcase Filter with Mounting Base 35-0312-BC299
DRAG SPECIALTIES
$33.87A quality crankcase filtration system is essential for keeping unwanted vapors and contaminants out of your intake tract—especially in high-performance and forced induction applications where clean air directly impacts engine reliability. This DRAG...DS289515- SKU:
- DS289515
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- PRODUCT NAME:
- VENT FILTER
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
$33.87
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.
