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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TRASK Breather Kit - Big Twin DM-1999
TRASK
$249.95Engine breather systems are often overlooked, but they're critical to maintaining proper crankcase ventilation and preventing oil contamination. The TRASK Breather Kit eliminates oil misting before it fouls your intake charge, while improving oil...09200118- SKU:
- 09200118
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- KIT
- PRODUCT NAME:
- BREATHER VALVE
- MATERIAL:
- ALUMINUM
$249.95 -
COLONY Acorn Front Belt Drive Pulley Nut 7816-1
COLONY
$14.95A secure front pulley connection is critical to reliable belt drive performance—any slippage or loosening can compromise your entire primary system. The COLONY Acorn Front Belt Drive Pulley Nut 7816-1 delivers the holding power and durability you need...DS193813- SKU:
- DS193813
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- NUT
- UNITS:
- EACH
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- TYPE:
- ACORN
$14.95 -
FEULING OIL PUMP CORP. Support Plate - Twin Cam 8000
FEULING OIL PUMP CORP.
$379.95Feuling® HIGH FLOW cam plates for T/C® engines increase engine oil flow and volume by enlarging the oil pump reservoirs and critical oil passages, including matching the oil port holes throughout the cam plate to the port holes in the engine case...09200006- SKU:
- 09200006
- Availability:
- Ships Same Business Day
- Weight:
- 2.26 LBS
- BASE COLOR:
- RED
- TYPE:
- GEAR
- UNITS:
- EACH
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- SUPPORT PLATE
$379.95 -
EASTERN MOTORCYCLE PARTS Crankpin Nut/Lock Kit A-23966-78
EASTERN MOTORCYCLE PARTS
$49.95A secure crankpin assembly is non-negotiable for engine reliability, and this fastener kit delivers the precision fit and locking integrity your engine needs to withstand sustained high RPM operation. Whether you're rebuilding a race engine or servicing...DS194010- SKU:
- DS194010
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- PRODUCT NAME:
- LOCK KIT
- RIDING STYLE:
- STREET
- TYPE:
- CRANKPIN
- UNITS:
- KIT
$49.95 -
EMGO Crankcase Filter Kit 14-20910
EMGO
$10.60High-quality crankcase breathers and filters from Emgo1420910- SKU:
- 1420910
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- FEATURES:
- RUBBER-TOP
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
- PRODUCT NAME:
- VENT FILTER
$10.60 -
EMGO Replacement Filter - Chrome 14-20905
EMGO
$11.94For use only with crankcase vent filter1420905- SKU:
- 1420905
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- FILTER
- UNITS:
- EACH
$11.94 -
EMGO Crankcase Filter Kit 14-20900
EMGO
$22.40High-quality crankcase breathers and filters from Emgo1420900- SKU:
- 1420900
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
- FEATURES:
- WITH CHROME BASE
- PRODUCT NAME:
- VENT FILTER
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- UNITS:
- EACH
$22.40 -
Jims Pinion Gear Shaft 1954-1957 Harley-Davidson FL 24006-54A
JIMS
$169.35The pinion gear shaft is critical to your Big Twin's drivetrain—it directly transfers engine power to the primary chain, and any wear or damage compromises throttle response and overall drivetrain efficiency. This JIMS unit restores factory-spec...DS194141- SKU:
- DS194141
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- TYPE:
- PINION SHAFT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GEAR
$169.35 -
Jims Pinion Shaft for 1987-1989 Harley-Davidson FLHS Electra Glide Sport 24006-87
JIMS
$156.95A precision pinion shaft is the foundation of a reliable engine rebuild—any runout or misalignment will cascade into flywheel issues and compromised performance. The JIMS 24006-87 delivers concentric accuracy within .0003", ensuring your Big Twin runs...DS194142- SKU:
- DS194142
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PINION SHAFT ASSEMBLY
$156.95Qty in Cart: 0Quantity:Price:$156.95Subtotal: -
Jims Pinion Gear Shaft 1939-1948 Harley-Davidson Big Twin 24007-39
JIMS
$193.05Your Big Twin's pinion gear shaft is the critical link between engine and transmission—wear or damage here directly impacts power delivery and longevity. The JIMS 24007-39 is precision-engineered to handle the high torque demands of serious riding while...DS194143- SKU:
- DS194143
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- PINION SHAFT
- PRODUCT NAME:
- GEAR
$193.05 -
Jims Crank Pin for 1957-1971 Harley-Davidson XLH900 23960-54
JIMS
$119.95The crank pin is a critical stress point in your Harley's engine, bearing constant rotational forces that demand precision engineering. This JIMS replacement restores OEM-spec tolerances, ensuring smooth power delivery and eliminating play that can lead...DS194002- SKU:
- DS194002
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- STREET
- TYPE:
- STANDARD
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- CRANKPIN
- BASE COLOR:
- SILVER
- UNITS:
- EACH
$119.95Qty in Cart: 0Quantity:Price:$119.95Subtotal: -
Jims Piston Oiling Jet Kit for Harley-Davidson Twin Cam 1999-2017 1905
JIMS
$235.25Stroker flywheels demand precision oiling to survive sustained high-RPM operation—stock oil jets simply can't deliver the volume needed for proper piston cooling and bearing protection. The JIMS Piston Oiling Jet Kit 1905 restores that critical oil flow,...09200050- SKU:
- 09200050
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- STREET
- BASE COLOR:
- SILVER
- COLOR/FINISH:
- SILVER
- TYPE:
- OILING
- UNITS:
- KIT
- PRODUCT NAME:
- JET KIT
$235.25 -
Jims Pinion Gear Shaft 1958-1972 Harley-Davidson FLH 24006-58
JIMS
$160.50A worn or damaged pinion gear shaft compromises power delivery and can lead to catastrophic drivetrain failure. The JIMS 24006-58 restores precise meshing between primary and transmission gears, ensuring consistent engagement and maximum efficiency...DS194086- SKU:
- DS194086
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- GEAR
- TYPE:
- PINION SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$160.50 -
Jims Pinion Shaft 1973-1981 Harley-Davidson FLH 24006-73
JIMS
$160.50The pinion shaft is the critical link between your primary drive and transmission—any wear or damage here directly impacts power delivery and reliability. JIMS' 24006-73 is precision-engineered to restore OEM performance standards while delivering the...DS194087- SKU:
- DS194087
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- GEAR
- TYPE:
- PINION SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$160.50 -
Jims Engine Sprocket Shaft for Harley-Davidson Big Twin 1981-1985 23909-80
JIMS
$169.45The JIMS Sprocket Shaft is a critical drivetrain component that directly impacts torque delivery and chain longevity on your Big Twin. Factory shafts wear over time, leading to slack in the primary drive and accelerated sprocket degradation. This U.S.A...DS194190- SKU:
- DS194190
- Availability:
- Ships Same Business Day
- Weight:
- 1.69 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- SPROCKET SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$169.45Qty in Cart: 0Quantity:Price:$169.45Subtotal: -
Jims Pinion Gear Shaft for 1981-1986 Harley-Davidson Big Twin 24006-80/83
JIMS
$160.50A worn or damaged pinion gear shaft compromises your Big Twin's primary drive efficiency and can lead to costly engine damage down the line. The JIMS Pinion Gear Shaft restores precise engagement between your primary and clutch assemblies, ensuring...DS194191- SKU:
- DS194191
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- GEAR
- TYPE:
- PINION SHAFT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$160.50 -
JIMS Crank Pin for Harley-Davidson Big Twin 1941-1981 23961-413
JIMS
$141.80A worn or damaged crank pin compromises your Big Twin's reliability and performance—this JIMS replacement ensures your engine maintains precise pin specifications for consistent power delivery and longevity. Built to OEM or better standards and...DS194004- SKU:
- DS194004
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- CRANKPIN
- BASE COLOR:
- SILVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- 3 HOLE
$141.80Qty in Cart: 0Quantity:Price:$141.80Subtotal: -
Jims Crank Pin for 1995-1998 Harley-Davidson Dyna Super Glide FXD 23961-80A3
JIMS
$145.50The crank pin is a critical rotating component that directly transfers combustion forces through your engine—any wear or damage compromises reliability and performance. This JIMS replacement meets or exceeds OEM specifications, ensuring your Big Twin...DS194005- SKU:
- DS194005
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- CRANKPIN
- TYPE:
- 3 HOLE
- BASE COLOR:
- SILVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$145.50 -
Jims Pinion Shaft Nut 1981-1989 Harley-Davidson FXSTC 24016-80
JIMS
$35.70A loose or worn pinion shaft nut compromises your drivetrain's integrity and can lead to catastrophic bearing failure and transmission damage. The JIMS Pinion Shaft Nut delivers the precision fit and holding power your flywheel-side pinion shaft demands,...DS198835- SKU:
- DS198835
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- NUT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- DIAMETER - THREAD SIZE IMPERIAL:
- 3/4-20
- TYPE:
- PINION SHAFT
$35.70 -
Jims Sprocket Shaft Nut for 1980-1985 Harley-Davidson Softail Standard FXST 24017-80
JIMS
$39.55The stock sprocket shaft nut on your 1980-1985 Softail Standard can loosen under sustained high-torque conditions, leading to chain slippage and potential drivetrain damage. JIMS' precision-engineered replacement ensures your sprocket stays locked in...DS198836- SKU:
- DS198836
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- NUT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- SPROCKET SHAFT
- DIAMETER - THREAD SIZE IMPERIAL:
- 1-1/8-16
$39.55
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.
