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 Rear Sprocket Spacer - .25" 26-0128-S25-SC2
DRAG SPECIALTIES
$19.21When upgrading to a wider rear tire, wheel offset becomes critical—and this spacer shim is your precision solution. The .25" thickness provides exact spacing to maintain proper belt or chain alignment while accommodating larger tire widths without...78055051- SKU:
- 78055051
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SPACER
- COLOR/FINISH:
- ZINC
- TYPE:
- PULLEY
- WIDTH IMPERIAL:
- 0.250'
- MOUNTING POSITION:
- REAR
- TYPE:
- SPROCKET
- UNITS:
- EACH
$19.21 -
DRAG SPECIALTIES Heavy Duty Throwout Bearing Kit 37312-75-HC3
DRAG SPECIALTIES
$34.93A worn or failing throwout bearing compromises clutch engagement and creates costly drivetrain issues. The DRAG SPECIALTIES Heavy Duty Throwout Bearing Kit delivers the precision fit and durability needed for reliable clutch actuation, whether you're...DS194116- SKU:
- DS194116
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- PRODUCT NAME:
- RELEASE BEARING
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- TYPE:
- CLUTCH
$34.93Qty in Cart: 0Quantity:Price:$34.93Subtotal: -
DRAG SPECIALTIES Compensating Sprocket Shaft Extension - +1-3/8" 346238
DRAG SPECIALTIES
$53.98When running wide tires on your drag setup, stock transmission geometry creates clearance issues that compromise both performance and reliability. This Drag Specialties compensating sprocket shaft extension solves that problem with a precision-engineered...11200002- SKU:
- 11200002
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
- PRODUCT NAME:
- SHAFT EXTENSION
- RIDING STYLE:
- STREET
- SIZE IMPERIAL:
- +1-3/8'
- UNITS:
- EACH
- MATERIAL:
- STEEL
- TYPE:
- COMPENSATING SPROCKET
$53.98Qty in Cart: 0Quantity:Price:$53.98Subtotal: -
DRAG SPECIALTIES Primary Drive Kit 210185
DRAG SPECIALTIES
$860.67A primary drive system is the heart of your clutch engagement and power delivery—get it wrong, and you're leaving performance on the table or facing catastrophic failure. The DRAG SPECIALTIES Primary Drive Kit 210185 delivers a complete, engineered...11200077- SKU:
- 11200077
- Availability:
- Ships Same Business Day
- Weight:
- 22.00 LBS
- TOOTH COUNT:
- 36
- UNITS:
- KIT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- PRIMARY CHAIN DRIVE KIT
$860.67Qty in Cart: 0Quantity:Price:$860.67Subtotal: -
DRAG SPECIALTIES Chrome Inspection Cover 210305
DRAG SPECIALTIES
$36.62A clean, professional engine bay starts with quality details—and this billet aluminum inspection cover delivers both durability and polished aesthetics. CNC-machined from solid billet stock, it resists corrosion and maintains its finish through years of...11070106- SKU:
- 11070106
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- STREET
- TYPE:
- PRIMARY
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- INSPECTION COVER
- UNITS:
- KIT
$36.62 -
DRAG SPECIALTIES Primary Cover 210366
DRAG SPECIALTIES
$353.95Engine bay protection starts with a reliable primary cover that shields internal components from debris, moisture, and contamination during operation. The Drag Specialties Primary Cover 210366 delivers die-cast aluminum construction that resists...11070285- SKU:
- 11070285
- Availability:
- Ships Same Business Day
- Weight:
- 5.80 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- TYPE:
- PRIMARY
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- SATIN
$353.95 -
DRAG SPECIALTIES Chrome Rear Belt Pulley - 70-Tooth 191397
DRAG SPECIALTIES
$516.76A precision-engineered rear belt pulley is critical for maintaining proper belt tension and drive ratios in your powertrain system. This DRAG Specialties pulley delivers OEM-specification performance with the durability you need for consistent operation,...12010003- SKU:
- 12010003
- Availability:
- Ships Same Business Day
- Weight:
- 7.18 LBS
- MATERIAL:
- DIE-CAST ALUMINUM
- PRODUCT NAME:
- PULLEY
- COLOR/FINISH:
- POLISHED CHROME
- UNITS:
- EACH
- TYPE:
- BELT DRIVE
- MOUNTING POSITION:
- REAR
- RIDING STYLE:
- STREET
- TOOTH COUNT:
- 70
- WIDTH IMPERIAL:
- 1.125'
$516.76 -
DRAG SPECIALTIES Chrome Rear Pulley - 66-Tooth 191311
DRAG SPECIALTIES
$478.70A properly sized rear pulley is critical for maintaining correct primary drive ratio and engine timing on your cruiser. The Drag Specialties 66-tooth chrome rear pulley delivers reliable performance while complementing laced wheel aesthetics, making it...12010541- SKU:
- 12010541
- Availability:
- Ships Same Business Day
- Weight:
- 6.10 LBS
- STYLE:
- 10 SPOKE
- MATERIAL:
- ALUMINUM
- MOUNTING POSITION:
- REAR
- TOOTH COUNT:
- 66
- PRODUCT NAME:
- PULLEY
- TYPE:
- BELT DRIVE
- WIDTH IMPERIAL:
- 0.787'
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$478.70Qty in Cart: 0Quantity:Price:$478.70Subtotal: -
DRAG SPECIALTIES Rear Pulley Insert - ST '07-'17 D26-0150
DRAG SPECIALTIES
$147.61The rear pulley insert is a critical component in your belt drive system—worn or damaged inserts compromise power transmission and accelerate wear on your entire drivetrain. This Drag Specialties insert restores OEM-spec fitment and finish, ensuring...12010443- SKU:
- 12010443
- Availability:
- Ships Same Business Day
- Weight:
- 2.44 LBS
- UNITS:
- EACH
- TYPE:
- PULLEY
- MODEL:
- PRECISION-FORMED
- COLOR/FINISH:
- CHROME
- MOUNTING POSITION:
- REAR
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
$147.61Qty in Cart: 0Quantity:Price:$147.61Subtotal: -
DRAG SPECIALTIES Kicker Spring 11-0112-BC206
DRAG SPECIALTIES
$21.15The Kicker Spring is a critical suspension component that directly impacts your bike's handling and ride quality. Over time, factory springs wear and lose their tension, resulting in poor suspension geometry and reduced performance. This exact...DS241006- SKU:
- DS241006
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- SPRING
- UNITS:
- EACH
- TYPE:
- KICK RETURN
$21.15 -
DRAG SPECIALTIES Clutch Snap Rings 17-0014-R-HC
DRAG SPECIALTIES
$11.61Clutch snap rings are critical retention components that keep your clutch pack properly seated and functioning under extreme load. Whether you're rebuilding a transmission after a hard season or performing preventative maintenance, having quality snap...11320091- SKU:
- 11320091
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SNAP RING
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH
- UNITS:
- 10 PACK
$11.61Qty in Cart: 0Quantity:Price:$11.61Subtotal: -
DRAG SPECIALTIES Rear Pulley Bolt Cover - Chrome D26-0152
DRAG SPECIALTIES
$113.37Rear pulley bolts are a detail many overlook—until dirt, moisture, and road debris compromise your engine's appearance and corrode critical fasteners. This Drag Specialties cover protects OEM hardware while adding a polished, finished look to your engine...12010597- SKU:
- 12010597
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- STREET
- TYPE:
- PULLEY BOLT
- UNITS:
- 5 PACK
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- COVER
- MATERIAL:
- DIE-CAST ALUMINUM
$113.37 -
DRAG SPECIALTIES Lower Belt Guard - 07-17 FLSTC/FLSTN 11 FXS - Chrome G32-0324
DRAG SPECIALTIES
$150.82Belt guards protect your drivetrain from road debris, mud, and moisture that can compromise chain and sprocket longevity—especially critical on cruisers where exposure is high. This Drag Specialties unit delivers reliable coverage with a clean chrome...12020076- SKU:
- 12020076
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
- TYPE:
- REAR BELT
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- LOWER
- RIDING STYLE:
- STREET
$150.82 -
DRAG SPECIALTIES Primary Chain Adjusting Shoe 15-0906-SC1
DRAG SPECIALTIES
$16.91A worn or damaged primary chain adjusting shoe compromises your clutch engagement and drivetrain reliability—especially under load. This DRAG Specialties replacement shoe restores precise chain tension and prevents costly slack that leads to premature...DS192003- SKU:
- DS192003
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- PRIMARY CHAIN
- UNITS:
- EACH
- PRODUCT NAME:
- ADJUSTING SHOE
- RIDING STYLE:
- STREET
- MATERIAL:
- NYLON
$16.91Qty in Cart: 0Quantity:Price:$16.91Subtotal: -
DRAG SPECIALTIES Upper Belt Guard - 00-03 XL - Chrome 32-0176-BXLB1
DRAG SPECIALTIES
$119.79Protect your primary drivetrain from debris, oil spray, and weather while maintaining the classic aesthetic of your Harley-Davidson XL. This chrome belt guard is a straightforward bolt-on upgrade that keeps maintenance intervals consistent and extends...19020175- SKU:
- 19020175
- Availability:
- Ships Same Business Day
- Weight:
- 2.15 LBS
- RIDING STYLE:
- STREET
- TYPE:
- REAR BELT
- MATERIAL:
- STEEL
- MOUNTING POSITION:
- UPPER
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- GUARD
- UNITS:
- EACH
$119.79Qty in Cart: 0Quantity:Price:$119.79Subtotal: -
DRAG SPECIALTIES Rear Sprocket Spacer - .250" 26-0125-S25-SC2
DRAG SPECIALTIES
$19.21Installing a wider rear tire requires precise wheel alignment, and this spacer delivers exactly that. The .250" offset corrects sprocket and pulley positioning to maintain proper chain or belt tension and prevent rubbing issues. Whether you're upgrading...DS199459- SKU:
- DS199459
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- RIDING STYLE:
- STREET
- TYPE:
- PULLEY
- WIDTH IMPERIAL:
- 0.250'
- PRODUCT NAME:
- SPACER
- UNITS:
- EACH
- COLOR/FINISH:
- ZINC
- MOUNTING POSITION:
- REAR
- TYPE:
- SPROCKET
- MATERIAL:
- STEEL
$19.21 -
DRAG SPECIALTIES Replacement Chain Adjuster Shoe G15-0940K-NU
DRAG SPECIALTIES
$24.33Stock automatic primary chain adjusters can creep over time, leading to excessive chain tension that accelerates wear on your motor sprocket and transmission drive bearings. The DRAG SPECIALTIES manual adjuster eliminates this problem by giving you...11200394- SKU:
- 11200394
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- UNITS:
- EACH
- TYPE:
- PRIMARY
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- PRIMARY CHAIN ADJUSTER KIT
- RIDING STYLE:
- STREET
$24.33Qty in Cart: 0Quantity:Price:$24.33Subtotal: -
DRAG SPECIALTIES 5-Hole - Chrome - Live to Ride Derby Cover D33-0110CA
DRAG SPECIALTIES
$104.95A quality derby cover does more than protect your engine—it's a statement about how you maintain your machine. The Drag Specialties 5-Hole Chrome Derby Cover combines reliable engine protection with classic styling that complements any cruiser build. The...11070554- SKU:
- 11070554
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- DERBY COVER
- MOUNTING STYLE:
- 5 HOLE
- RIDING STYLE:
- STREET
- MODEL:
- LIVE TO RIDE
- STYLE:
- EAGLE WITH BANNER
$104.95Qty in Cart: 0Quantity:Price:$104.95Subtotal: -
DRAG SPECIALTIES Matte Black Derby Cover D33-0110MB
DRAG SPECIALTIES
$105.95A clean, professional derby cover protects your primary chaincase from debris and weather while delivering the aggressive aesthetic that defines modern Big Twin styling. This die-cast cover combines durability with a refined matte black finish that...11070557- SKU:
- 11070557
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- MOUNTING STYLE:
- 5 HOLE
- MATERIAL:
- ALUMINUM
- MATERIAL:
- DIE-CAST
- PRODUCT NAME:
- DERBY COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- COLOR/FINISH:
- MATTE BLACK
$105.95 -
DRAG SPECIALTIES Inspection Cover - Chrome - '85-'94 FXR 33-0009A
DRAG SPECIALTIES
$44.95Keep your FXR's engine bay looking showroom-fresh while protecting critical internal components from dirt and debris. This chrome-plated inspection cover delivers the clean, finished appearance that separates a well-maintained machine from a neglected...11070389- SKU:
- 11070389
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- TYPE:
- PRIMARY
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- MATERIAL:
- STEEL
- PRODUCT NAME:
- INSPECTION COVER
- MOUNTING STYLE:
- 4 HOLE
- RIDING STYLE:
- STREET
$44.95
