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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On Sale
S&S CYCLE Super Stock¢â€žÂ¢ Engine Case 31-0004
S&S CYCLE
MSRP: $1,995.95Now: $1,796.36Was: $1,995.95Cast 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...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: $2,152.95Now: $1,937.66Was: $2,152.95Cast from A356 T-6 heat-treated aluminum alloy, Includes 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...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: $2,152.95Now: $1,937.66Was: $2,152.95 -
EASTERN MOTORCYCLE PARTS Flywheel Thrust Washer Set - 11 pack A-24100-SET
EASTERN MOTORCYCLE PARTS
$68.95Set includes flywheel thrust washers in 11 different thicknesses, ranging from .060" to .102", Made in the U.S.A.DS194056- SKU:
- DS194056
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- WASHER
- RIDING STYLE:
- STREET
- TYPE:
- THRUST
- UNITS:
- SET OF 11
$68.95Qty in Cart: 0Quantity:Price:$68.95Subtotal: -
Jims Right-Side Crankcase Bushing 1940-1947 Knucklehead FL 24599-40
JIMS
$154.95The JIMS Crankcase Bushing 24599-40 is engineered for optimal performance and reliability, ensuring your engine runs smoothly with enhanced oil flow. Proudly made in the U.S.A., this bushing is designed to meet the highest standards of quality and...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
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Jims Sprocket Shaft 1936-1947 Harley-Davidson EL FL 24001-30
JIMS
$104.95Upgrade your vintage motorcycle with the JIMS Sprocket Shaft, expertly crafted for models between 1930 and 1954. Made in the U.S.A., this high-quality replacement part ensures durability and optimal performance, allowing you to ride with confidence...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
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
Jims Crankcase Bushing for Harley-Davidson FL 1958-1964 24599-58B
JIMS
$134.95Upgrade your Big Twin motorcycle with the JIMS Crankcase Bushing 24599-58B, designed for optimal performance and durability. This high-quality bushing ensures 360° oiling, significantly enhancing engine efficiency and longevity. Proudly made in the U.S.A...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
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Jims Rod Race Set for 1941-1999 Harley-Davidson Big Twin 1046-36A
JIMS
$103.95Elevate your engine's performance with the JIMS Rod Race Set Big Twin 1046-36A, expertly crafted from premium 52100 aerospace-quality Timken® bearing stock. Designed and manufactured in the U.S.A., this rod race set ensures exceptional durability and...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
$103.95Qty in Cart: 0Quantity:Price:$103.95Subtotal: -
Jims Sprocket Shaft for Harley-Davidson FL 1956-1964 24001-56
JIMS
$154.95Enhance the performance of your classic motorcycle with the JIMS Sprocket Shaft, expertly crafted for models from 1956 to 1964. Made in the U.S.A., this durable component ensures reliability and longevity, making it an essential upgrade for any vintage...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
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Jims Right-Side Crankcase Bushing for 1995-1998 Harley-Davidson Dyna Convertible FXDS-CONV 24600-58B
JIMS
$159.95Enhance the performance and longevity of your engine with the JIMS Crankcase Bushing 24600-58B. Engineered for precision and durability, this bushing ensures optimal oil flow and reduces wear on critical components. Proudly made in the U.S.A., it’s a...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
$159.95Qty in Cart: 0Quantity:Price:$159.95Subtotal: -
Jims 1990-1992 Harley-Davidson Softail Standard FXST Gear-Side Pinion Shaft Nut 24022-90
JIMS
$33.95The JIMS Gear-Side Pinion Shaft Nut 24022-90 is a high-quality replacement part designed specifically for precision performance in your motorcycle. With its durable construction and left-hand threads, this nut ensures a secure fit and reliable operation,...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
$33.95 -
Jims Gear-Side Pinion Shaft Nut for 1984-1989 Harley-Davidson Softail Custom FXSTC 24023-54
JIMS
$22.95Upgrade your motorcycle's performance with the JIMS Gear-Side Pinion Shaft Nut 24023-54. Designed with precision engineering, this nut ensures a secure fit and optimal function for your bike's gear system. Its durable construction and left-hand threads...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
$22.95Qty in Cart: 0Quantity:Price:$22.95Subtotal: -
EASTERN MOTORCYCLE PARTS Bearing Spacers - 5 pack A-9131
EASTERN MOTORCYCLE PARTS
$14.60High-quality OEM replacement components, Made in the U.S.A.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'
$14.60 -
DRAG SPECIALTIES Crankcase Filter with Mounting Base 35-0312-BC299
DRAG SPECIALTIES
$32.91One-piece crankcase filter assembly comes complete with filter clamp and a chrome, die-cast mounting base and accepts a 3/8" i.d. hose, Replacement filters sold separatelyDS289515- 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
$32.91Qty in Cart: 0Quantity:Price:$32.91Subtotal:
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.
