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
$249.95Machined T-6061 billet aluminum construction, Helps oil drain more efficiently into the rocker, Reduces oil misting coming from the engine breathers, Made in the U.S.A.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
$14.95Chrome front pulley nut for open primary belt drive applications, Made in the U.S.A.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
$14.95Qty in Cart: 0Quantity:Price:$14.95Subtotal: -
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
$49.95Includes nuts, locks, and screws, Made in the U.S.A.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
$165.95Introducing the JIMS Pinion Gear Shaft for Big Twin motorcycles, a premium quality component crafted in the U.S.A. Designed for durability and precision, this pinion gear shaft ensures optimal performance and reliability in your engine. Upgrade your ride...DS194141- SKU:
- DS194141
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- TYPE:
- PINION SHAFT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- GEAR
$165.95 -
Jims Pinion Shaft for 1987-1989 Harley-Davidson FLHS Electra Glide Sport 24006-87
JIMS
$156.95Elevate your engine's performance with the JIMS Pinion Shaft Big Twin 24006-87, expertly crafted for precision and durability. Made from high-quality domestic steel, this pinion shaft is designed to ensure optimal flywheel alignment, making it an...DS194142- SKU:
- DS194142
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PINION SHAFT ASSEMBLY
$156.95 -
Jims Pinion Gear Shaft 1939-1948 Harley-Davidson Big Twin 24007-39
JIMS
$188.95Experience unparalleled performance with the JIMS Pinion Gear Shaft, specifically designed for Big Twin models. Crafted in the U.S.A., this premium component ensures durability and precision, making it an essential upgrade for any serious motorcycle...DS194143- SKU:
- DS194143
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- PINION SHAFT
- PRODUCT NAME:
- GEAR
$188.95 -
Jims Crank Pin for 1957-1971 Harley-Davidson XLH900 23960-54
JIMS
$119.95Upgrade your engine's performance with the JIMS Crank Pin XL 23960-54, a high-quality replacement part designed to meet or exceed OEM specifications. Proudly made in the U.S.A., this crank pin ensures durability and reliability for your motorcycle...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
$119.95 -
Jims Piston Oiling Jet Kit for Harley-Davidson Twin Cam 1999-2017 1905
JIMS
$234.95Enhance your motorcycle's performance with the JIMS Piston Oiling Jet Kit 1905, specifically engineered for upgraded stroker flywheels. This kit ensures optimal lubrication for both stock and high-performance flywheel assemblies, providing reliability...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
$234.95 -
Jims Pinion Gear Shaft 1958-1972 Harley-Davidson FLH 24006-58
JIMS
$156.95Enhance the performance of your motorcycle with the JIMS Pinion Gear Shaft 24006-58, meticulously crafted in the U.S.A. Designed for durability and precision, this pinion gear shaft ensures optimal functionality and reliability for your engine. Upgrade...DS194086- SKU:
- DS194086
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- GEAR
- TYPE:
- PINION SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$156.95 -
Jims Pinion Shaft 1973-1981 Harley-Davidson FLH 24006-73
JIMS
$156.95Elevate your motorcycle's performance with the JIMS Pinion Gear Shaft 24006-73, expertly crafted in the U.S.A. This high-quality component ensures optimal durability and precision for a smooth ride. Designed for enthusiasts who demand the best, this gear...DS194087- SKU:
- DS194087
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- GEAR
- TYPE:
- PINION SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$156.95 -
Jims Engine Sprocket Shaft for Harley-Davidson Big Twin 1981-1985 23909-80
JIMS
$168.95Experience superior performance and durability with the JIMS Sprocket Shaft, specifically designed for Big Twin models. Crafted in the U.S.A., this precision-engineered component ensures a perfect fit and reliable operation, enhancing your motorcycle's...DS194190- SKU:
- DS194190
- Availability:
- Ships Same Business Day
- Weight:
- 1.69 LBS
- PRODUCT NAME:
- GASKET
- TYPE:
- SPROCKET SHAFT
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$168.95 -
Jims Pinion Gear Shaft for 1981-1986 Harley-Davidson Big Twin 24006-80/83
JIMS
$156.95Upgrade your Big Twin motorcycle with the JIMS Pinion Gear Shaft, designed for models from 1980 to 1983. Crafted with precision in the U.S.A., this durable component ensures optimal performance and reliability, enhancing your ride experience. Trust JIMS...DS194191- SKU:
- DS194191
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- PRODUCT NAME:
- GEAR
- TYPE:
- PINION SHAFT
- UNITS:
- EACH
- RIDING STYLE:
- STREET
$156.95 -
JIMS Crank Pin for Harley-Davidson Big Twin 1941-1981 23961-413
JIMS
$138.95Upgrade your motorcycle's performance with the JIMS Crank Pin Big Twin 23961-413, a high-quality replacement part designed to meet or exceed OEM specifications. Manufactured in the U.S.A., this crank pin ensures durability and reliability for optimal...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
$138.95 -
Jims Crank Pin for 1995-1998 Harley-Davidson Dyna Super Glide FXD 23961-80A3
JIMS
$142.95Upgrade your engine's performance with the JIMS Crank Pin Big Twin 23961-80A3, a premium replacement part designed to meet or exceed OEM standards. Crafted in the U.S.A., this crank pin ensures durability and reliability, making it an essential component...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
$142.95 -
Jims Pinion Shaft Nut 1981-1989 Harley-Davidson FXSTC 24016-80
JIMS
$35.95The JIMS Pinion Shaft Nut is an essential component designed for optimal performance in your motorcycle's drivetrain. Engineered with precision, this heavy-duty nut ensures a secure fit on the flywheel-side of the pinion shaft, providing reliability and...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
$35.95 -
Jims Sprocket Shaft Nut for 1980-1985 Harley-Davidson Softail Standard FXST 24017-80
JIMS
$39.95Upgrade your motorcycle's performance with the JIMS Sprocket Shaft Nut 24017-80, designed for durability and precision. This heavy-duty nut securely fits the flywheel side of the sprocket shaft, ensuring optimal functionality and reliability. Crafted 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
$39.95
