Harley Drivetrain
Harley Bike Drivetrain Parts at JJ Motorsports
Upgrade your Harley's drivetrain for smoother power delivery and reliability with components from JJ Motorsports. Our selection includes transmission mounting plates, offset sprockets, mechanical reverse kits, starter spacers, pulley spacers, and primary covers designed for heavy-duty use, easy bolt-in installation, and enhanced performance. Compatible with Big Twins, Softail, Dyna, and more, these parts feature chrome finishes, billet aluminum, and CNC-machined steel for corrosion resistance and custom fitment.
Shop trusted brands like Paughco for primary covers and PBI for sprockets. Explore related categories such as Harley engine parts for rebuilds or Harley suspension for balanced setups.
Top Harley Drivetrain Products
- PAUGHCO Transmission Plate - OE Type 4-Speed 218 – Heavy-duty steel for Big Twins with 4-speed transmissions.
- PBI Offset Transmission Sprocket - 22-Tooth 281-22 – CNC-machined chromoly steel with 0.750" offset for 530 chains.
- MOTOR TRIKE Mechanical Reverse Kit MTTR-0025 – Lightweight aluminum with electronic cut-off for easy parking.
- TERRY COMPONENTS Starter Spacer 779000 – Billet aluminum, 1-1/2" thick for longer starters.
- PINGEL Rear Pulley Spacer 62051 – Billet aluminum for wider tires up to 142mm.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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DRAG SPECIALTIES Primary Drive Kit 210184
DRAG SPECIALTIES
$833.00A properly functioning primary drive system is the foundation of reliable clutch engagement and smooth power transfer to your wheel. The DRAG SPECIALTIES Primary Drive Kit 210184 delivers OEM-quality components engineered for consistent performance,...11200078- SKU:
- 11200078
- Availability:
- Ships Same Business Day
- Weight:
- 21.75 LBS
- PRODUCT NAME:
- PRIMARY CHAIN DRIVE KIT
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 37
- UNITS:
- KIT
$833.00Qty in Cart: 0Quantity:Price:$833.00Subtotal: -
DRAG SPECIALTIES Kickstarter Pedal - Brass 361603
DRAG SPECIALTIES
$162.13A reliable kickstarter pedal is essential for consistent engine starts and smooth operation on vintage and custom motorcycles. The DRAG Specialties Kickstarter Pedal combines heavy-duty brass construction with a reinforced steel liner core, delivering...11120031- SKU:
- 11120031
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- RIDING STYLE:
- STREET
- TYPE:
- KICK PEDAL
- PRODUCT NAME:
- KICK PEDAL
- COLOR/FINISH:
- BRASS
- MATERIAL:
- BRASS
- UNITS:
- EACH
$162.13 -
DRAG SPECIALTIES Compensator Sprocket 241271
DRAG SPECIALTIES
$220.43The DRAG SPECIALTIES Compensator Sprocket is engineered to maintain precise primary drive engagement and reduce shock loads in your drivetrain. A quality compensator sprocket minimizes chain slack and wear, ensuring consistent power delivery during...11200304- SKU:
- 11200304
- Availability:
- Ships Same Business Day
- Weight:
- 5.40 LBS
- TYPE:
- COMPENSATING
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SPROCKET
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 34
- UNITS:
- EACH
$220.43 -
DRAG SPECIALTIES Outer Primary Cover - Chrome - '99-'06 FL 210207
DRAG SPECIALTIES
$412.95A worn or damaged primary cover compromises both the aesthetic appeal and protective integrity of your FL's drivetrain. This Drag Specialties outer primary cover restores your bike's classic appearance while shielding critical primary components from...11070044- SKU:
- 11070044
- Availability:
- Ships Same Business Day
- Weight:
- 6.91 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- OUTER PRIMARY
$412.95 -
DRAG SPECIALTIES Primary Cover 210304
DRAG SPECIALTIES
$356.95A primary cover protects your engine's internal components from dirt, debris, and moisture while maintaining a clean, finished appearance. This die-cast aluminum construction offers superior durability and heat dissipation compared to plastic...11070105- SKU:
- 11070105
- Availability:
- Ships Same Business Day
- Weight:
- 5.87 LBS
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- PRIMARY
$356.95 -
DRAG SPECIALTIES Transmission Cover - Black 302125
DRAG SPECIALTIES
$73.95A transmission cover serves as essential engine bay protection, shielding critical drivetrain components from debris, heat exposure, and contamination during high-performance driving. This Drag Specialties unit combines durable construction with a clean...11070355- SKU:
- 11070355
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- COLOR/FINISH:
- BLACK
- MOUNTING STYLE:
- 6 HOLE
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- SATIN
- MATERIAL:
- ZINC
- TYPE:
- TRANSMISSION SIDE
$73.95 -
DRAG SPECIALTIES Outer Primary Cover - Black - '99-'06 FL 210212
DRAG SPECIALTIES
$368.95The Drag Specialties Outer Primary Cover provides a clean, finished appearance while protecting your primary drivetrain from road debris and weather exposure. Whether you're refreshing your bike's aesthetic or replacing a damaged cover, this die-cast...11070356- SKU:
- 11070356
- Availability:
- Ships Same Business Day
- Weight:
- 6.40 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- SATIN BLACK
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER
- TYPE:
- OUTER PRIMARY
- UNITS:
- EACH
$368.95 -
DRAG SPECIALTIES Satin Black Derby Cover 301500
DRAG SPECIALTIES
$49.95A quality derby cover protects your primary cover from road debris, UV exposure, and oxidation while maintaining the clean, finished appearance of your engine. This die-cast satin black cover delivers the durability you need without compromising the...11070440- SKU:
- 11070440
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- COLOR/FINISH:
- SATIN BLACK
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- RIDING STYLE:
- STREET
- MOUNTING STYLE:
- 6 HOLE
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
DRAG SPECIALTIES Wrinkle Black Derby Cover 301498
DRAG SPECIALTIES
$48.31A derby cover does more than protect your primary cover from road debris and UV damage—it's a critical maintenance component that extends the life of your engine's primary case seal. The Drag Specialties Wrinkle Black Derby Cover combines classic...11070441- SKU:
- 11070441
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- WRINKLE BLACK
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
$48.31Qty in Cart: 0Quantity:Price:$48.31Subtotal: -
DRAG SPECIALTIES Primary Cover 210364
DRAG SPECIALTIES
$302.95The DRAG Specialties Primary Cover 210364 protects your engine's internal components from contaminants while maintaining a clean, finished appearance on your motorcycle. Die-cast aluminum construction delivers durability and corrosion resistance without...11070283- SKU:
- 11070283
- Availability:
- Ships Same Business Day
- Weight:
- 5.80 LBS
- TYPE:
- PRIMARY
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- SATIN
$302.95 -
DRAG SPECIALTIES Primary Cover 210306
DRAG SPECIALTIES
$400.95A primary cover protects your engine's internal components from debris, moisture, and contamination while maintaining a clean, finished appearance. This die-cast aluminum construction delivers durability without adding unnecessary weight, making it an...11070284- SKU:
- 11070284
- Availability:
- Ships Same Business Day
- Weight:
- 5.80 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
$400.95Qty in Cart: 0Quantity:Price:$400.95Subtotal: -
DRAG SPECIALTIES Black Inspection Cover 210365
DRAG SPECIALTIES
$32.00A quality inspection cover protects critical engine components from dirt, debris, and moisture while maintaining a clean, finished appearance in your engine bay. Whether you're running a show bike or a daily driver, this billet aluminum cover delivers...11070286- SKU:
- 11070286
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- INSPECTION COVER
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- UNITS:
- KIT
$32.00 -
DRAG SPECIALTIES Gloss Black Derby Cover 301496
DRAG SPECIALTIES
$48.31A derby cover does more than protect your primary chaincase from road debris and weather—it's a visual statement on your bike. The DRAG Specialties Gloss Black Derby Cover delivers a factory-quality finish that complements any Big Twin aesthetic while...11070287- SKU:
- 11070287
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- DERBY COVER
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- COLOR/FINISH:
- GLOSS BLACK
- MOUNTING STYLE:
- 6 HOLE
- RIDING STYLE:
- STREET
$48.31Qty in Cart: 0Quantity:Price:$48.31Subtotal: -
DRAG SPECIALTIES Transmission Cover - Black 302164
DRAG SPECIALTIES
$87.93A transmission cover isn't just cosmetic—it protects your gearbox from debris, heat, and contamination while presenting a finished, professional appearance under the hood. This DRAG SPECIALTIES cover pairs seamlessly with flat black engine components for...11050241- SKU:
- 11050241
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- RIDING STYLE:
- STREET
- TYPE:
- TRANSMISSION END
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$87.93 -
DRAG SPECIALTIES Clutch Hub 148421
DRAG SPECIALTIES
$194.99A worn or damaged clutch hub compromises power transfer and creates slippage under load—exactly what you can't afford on the track or during hard acceleration. The DRAG SPECIALTIES Clutch Hub 148421 features a reinforced insert design that handles...11320944- SKU:
- 11320944
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- PRODUCT NAME:
- INNER HUB
- TYPE:
- CLUTCH
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$194.99Qty in Cart: 0Quantity:Price:$194.99Subtotal: -
DRAG SPECIALTIES Rear Pulley Spacer - .500" 193085
DRAG SPECIALTIES
$45.96When transitioning to a wider rear tire setup, wheel offset becomes critical to maintaining proper suspension geometry and brake clearance. The DRAG SPECIALTIES Rear Pulley Spacer provides the precise .500" offset needed to accommodate wide tire...12010100- SKU:
- 12010100
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- SPACER
- COLOR/FINISH:
- RAW
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- MATERIAL:
- BILLET ALUMINUM
- TYPE:
- PULLEY
- WIDTH IMPERIAL:
- 0.500'
$45.96 -
DRAG SPECIALTIES Rear Pulley Insert - XL '04-'20 302220
DRAG SPECIALTIES
$112.30If your XL Harley's rear pulley is showing wear or damage to the belt drive sprocket, a precision replacement insert restores proper belt alignment and eliminates slippage that compromises power delivery. This OEM-matched insert ensures your primary...12010520- SKU:
- 12010520
- Availability:
- Ships Same Business Day
- Weight:
- 2.02 LBS
- RIDING STYLE:
- STREET
- TYPE:
- PULLEY
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- MODEL:
- PRECISION-FORMED
- UNITS:
- EACH
- MOUNTING POSITION:
- REAR
$112.30 -
DRAG SPECIALTIES Chrome Rear Pulley - 66-Tooth 191312
DRAG SPECIALTIES
$516.76A properly sized rear pulley is critical for maintaining belt tension, synchronizing your drivetrain, and ensuring reliable power delivery in high-demand applications. This Drag Specialties 66-tooth chrome pulley delivers OEM-grade durability with a...12010542- SKU:
- 12010542
- Availability:
- Ships Same Business Day
- Weight:
- 6.51 LBS
- COLOR/FINISH:
- CHROME
- TYPE:
- BELT DRIVE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PULLEY
- RIDING STYLE:
- STREET
- WIDTH IMPERIAL:
- 1.000'
- UNITS:
- EACH
- MOUNTING POSITION:
- REAR
- STYLE:
- 10 SPOKE
- TOOTH COUNT:
- 66
$516.76Qty in Cart: 0Quantity:Price:$516.76Subtotal: -
DRAG SPECIALTIES Upper Belt Guard - 04-20 XL - Chrome 105053
DRAG SPECIALTIES
$109.09Protect your primary drive belt from road debris and contamination with a heavy-duty upper belt guard designed specifically for Harley-Davidson XL models. This chrome-finished guard maintains factory aesthetics while shielding critical drivetrain...12020012- SKU:
- 12020012
- Availability:
- Ships Same Business Day
- Weight:
- 2.29 LBS
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- UPPER
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
- TYPE:
- REAR BELT
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
$109.09 -
DRAG SPECIALTIES Offset Sprocket Kit - 21-Tooth 191371-BX-LB1
DRAG SPECIALTIES
$47.03Running extra-wide tires on your drag machine requires precision spacing to maintain proper chain alignment and sprocket clearance. The DRAG SPECIALTIES Offset Sprocket Kit eliminates guesswork by providing an engineered solution that lets you maximize...DS191056- SKU:
- DS191056
- Availability:
- Ships Same Business Day
- Weight:
- 2.75 LBS
- RIDING STYLE:
- STREET
- CHAIN SIZE:
- 530
- OFFSET IMPERIAL:
- 0.200'
- COLOR/FINISH:
- BLACK
- TOOTH COUNT:
- 21
- TYPE:
- MAINSHAFT
- UNITS:
- KIT
- PRODUCT NAME:
- SPROCKET
$47.03
