Harley Engine
Harley Bike Engine Parts at JJ Motorsports
Rebuild and boost your Harley's engine with premium parts from JJ Motorsports. Our inventory features complete gasket sets, piston kits, oil filters, pushrod tubes, and coolers designed for maximum strength, leak-free sealing, and high-performance in extreme conditions. Compatible with Big Twins, Softail, Touring, and more, these components support top-end overhauls, oil management, and durability for street rides or custom builds.
Shop trusted brands like Drag Specialties for magnetic filters and Wiseco for forged pistons. Explore related categories such as Harley air and fuel for carb tuning or Harley drivetrain for transmission upgrades.
Top Harley Engine Products
- DRAG SPECIALTIES Magnetic Ring Oil Filter - Chrome - 3-1/4" 140003HP-BX18 – Captures metal particles with pressure relief.
- WISECO Piston Kit .010 .883 XL K1656 – Forged aluminum with rings, pins, and circlips for rebuilds.
- DRAG SPECIALTIES Pushrod Tube Kit Big Twin 75711 – Includes tubes, clips, cups, and springs for complete engine.
- ULTRACOOL Below Regulator Mount Oil Cooler Stainless Steel RF-2CSS – Fits S&S 111/124/143 engines with machined adapter.
- PAUGHCO Ribbed Teardrop Air Cleaner 701-200 – Chrome-plated aluminum with mini filter.
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
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On Sale
S&S CYCLE 132" Big-Bore Cylinder Kit - Black Granite/Highlighted Fins - M8 910-0847
S&S CYCLE
MSRP: $1,599.95Now: $1,484.96Was: $1,599.95The S&S Cycle 132" Big-Bore Cylinder Kit delivers substantial displacement gains without the complexity of a full engine rebuild. This bolt-on upgrade retains your stock engine height and original serial numbers, making it an ideal choice for riders...09311112- SKU:
- 09311112
- Availability:
- Ships Same Business Day
- Weight:
- 28.21 LBS
MSRP: $1,599.95Now: $1,484.96Was: $1,599.95 -
FEULING OIL PUMP CORP. Rocker Shaft Shims - 0.003"/0.005"/0.010" - M8 1230
FEULING OIL PUMP CORP.
$79.95Excessive rocker arm end play causes noise, oil starvation, and accelerated wear on your cylinder head—issues that compound quickly on high-performance engines. These hardened steel shims restore proper clearance, allowing you to dial in the ideal 0...09300240- SKU:
- 09300240
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
FEULING OIL PUMP CORP. Retainer Kit - Titanium - +0.050" - M8 1208
FEULING OIL PUMP CORP.
$229.95High-RPM stability demands precise valve control, and stock retainers often struggle under extreme load. Feuling's titanium retainers deliver the strength-to-weight ratio necessary for consistent valve seating and reduced float, critical for...09263435- SKU:
- 09263435
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$229.95 -
FEULING OIL PUMP CORP. Race Series Oil System Kit - Twin Cam 7484
FEULING OIL PUMP CORP.
$1,259.95A tired cam chest and worn oil system rob your Twin Cam engine of reliability and peak performance. The Feuling Race Series Oil System Kit gives you a complete refresh with OE+ components and a high-volume pump, eliminating the guesswork and ensuring...09320300- SKU:
- 09320300
- Availability:
- Ships Same Business Day
- Weight:
- 6.90 LBS
$1,259.95 -
FEULING OIL PUMP CORP. Crankshaft Bearing Race Kit - Undersize Pinion Race - Twin Cam B Engines | M8 5206
FEULING OIL PUMP CORP.
$89.95When pinion race spinning compromises your crankshaft assembly, you need a precision repair solution—not a complete rebuild. The Feuling Oil Pump Corp. Crankshaft Bearing Race Kit restores your Twin Cam B engine to OEM specifications, allowing you to...09210938- SKU:
- 09210938
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$89.95 -
FEULING OIL PUMP CORP. HP+ Hydraulic Cam Chain Tensioner Conversion Kit - '99-'00 TC C 7187
FEULING OIL PUMP CORP.
$1,439.95If you're running a '99-'06 Harley-Davidson Twin Cam with a mechanical spring tensioner, you're operating with outdated cam chain technology that limits reliability and performance. This Feuling conversion kit upgrades your engine to the superior...09251501- SKU:
- 09251501
- Availability:
- Ships Same Business Day
- Weight:
- 6.91 LBS
$1,439.95 -
FEULING OIL PUMP CORP. HP+ Hydraulic Cam Chain Tensioner Conversion Kit - '01-'06 TC C 7188
FEULING OIL PUMP CORP.
$1,439.95If you're running an early Harley-Davidson Twin Cam with a mechanical spring tensioner, you're dealing with inherent wear, noise, and potential chain slack issues that compromise reliability and performance. The Feuling HP+ Hydraulic Cam Chain Tensioner...09251502- SKU:
- 09251502
- Availability:
- Ships Same Business Day
- Weight:
- 6.89 LBS
$1,439.95 -
FEULING OIL PUMP CORP. HP+ Hydraulic Cam Chain Tensioner Conversion Kit - '99-00 TC 7189
FEULING OIL PUMP CORP.
$1,439.95If you're running a '99-'00 Twin Cam with a mechanical spring tensioner, you're operating with outdated cam chain technology that limits reliability and performance potential. This Feuling conversion kit upgrades your entire cam drive system to the...09251503- SKU:
- 09251503
- Availability:
- Ships Same Business Day
- Weight:
- 7.35 LBS
$1,439.95 -
FEULING OIL PUMP CORP. HP+ Hydraulic Cam Chain Tensioner Conversion Kit - '01-06 TC 7190
FEULING OIL PUMP CORP.
$1,439.95If you're running an early '99-'06 Twin Cam with a mechanical spring tensioner, you're operating with outdated cam chain management technology. The Feuling HP+ Hydraulic Cam Chain Tensioner Conversion Kit upgrades your entire cam drive system to the...09251504- SKU:
- 09251504
- Availability:
- Ships Same Business Day
- Weight:
- 7.26 LBS
$1,439.95 -
FEULING OIL PUMP CORP. Race Series Hydraulic Cam Chain Tensioner Conversion Kit - '99-'00 TC C 7191
FEULING OIL PUMP CORP.
$1,699.95If you're running a '99-'00 Twin Cam with a mechanical spring tensioner, you're carrying unnecessary weight and complexity—and losing reliability in the process. This Feuling conversion kit swaps your outdated tensioner system for the superior hydraulic...09251505- SKU:
- 09251505
- Availability:
- Ships Same Business Day
- Weight:
- 7.01 LBS
$1,699.95 -
FEULING OIL PUMP CORP. Race Series Hydraulic Cam Chain Tensioner Conversion Kit - '01-'06 TC 7194
FEULING OIL PUMP CORP.
$1,649.95If you're running an early Harley-Davidson Twin Cam with a mechanical spring tensioner, you're dealing with outdated cam chain management that can't keep pace with modern performance demands. This Feuling conversion kit upgrades your entire cam drive...09251508- SKU:
- 09251508
- Availability:
- Ships Same Business Day
- Weight:
- 7.36 LBS
$1,649.95 -
FEULING OIL PUMP CORP. Retainer Kit - Titanium - -0.050" - M8 1110
FEULING OIL PUMP CORP.
$219.95High-RPM applications demand valve spring retainers that can handle extreme pressures without deflection or failure. Feuling's titanium retainers deliver the strength-to-weight ratio needed for sustained performance, reducing mass while maintaining...09263434- SKU:
- 09263434
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
$219.95 -
ANDREWS Cam - Bolt-In - 465B - M8 217465
ANDREWS
$268.95If you're running a 107" or 117" Big Twin and want real-world torque where it matters—down low and through the midrange—this Andrews 465B delivers. Stock valve springs mean bolt-in installation without custom machine work, making this the straightforward...09251509- SKU:
- 09251509
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
$268.95 -
ANDREWS Cam - Bolt-In - 485 - M8 217485
ANDREWS
$268.95If you're running a 107ci engine or larger on a budget-conscious build, the ANDREWS 485 Cam delivers genuine low-to-mid-range power without forcing you to upgrade your valve springs or machine work. This bolt-in cam maximizes lift within the constraints...09251510- SKU:
- 09251510
- Availability:
- Ships Same Business Day
- Weight:
- 1.85 LBS
$268.95 -
DRAG SPECIALTIES Pushrod Tube Kit - Chrome - M8 78052
DRAG SPECIALTIES
$132.45Pushrod tubes are critical to engine reliability, especially in high-performance applications where valve train stability directly impacts power delivery and longevity. DRAG SPECIALTIES' chrome-finished pushrod tube kit for M8 engines delivers...09402105- SKU:
- 09402105
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$132.45 -
JAGG OIL COOLERS Oil Filter Adapter - Offset 4702
JAGG OIL COOLERS
$170.95If you're running an oil cooler setup, proper flow management is critical to engine longevity and performance. The JAGG Oil Filter Adapter - Offset 4702 simplifies installation while its integrated thermostatic bypass valve ensures your engine reaches...07130271- SKU:
- 07130271
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
$170.95 -
JAGG OIL COOLERS Oil Cooler Kit - Low Mount - Touring 750-2300-0323
JAGG OIL COOLERS
$450.95Extended engine life depends on oil temperature management—elevated heat accelerates wear, reduces viscosity, and compromises lubrication. The JAGG Low Mount Oil Cooler Kit uses turbulator technology and multi-pass flow design to dissipate heat...07130276- SKU:
- 07130276
- Availability:
- Ships Same Business Day
- Weight:
- 4.01 LBS
$450.95 -
JAGG OIL COOLERS Fan-Assisted Oil Cooler Kit - Low Mount - Touring 751-FP2300-0323
JAGG OIL COOLERS
$574.95Maintaining consistent oil temperatures is critical for engine longevity and performance, especially in touring applications where stop-and-go traffic and sustained highway riding demand reliable thermal management. The JAGG Fan-Assisted Oil Cooler Kit...07130277- SKU:
- 07130277
- Availability:
- Ships Same Business Day
- Weight:
- 5.10 LBS
$574.95Qty in Cart: 0Quantity:Price:$574.95Subtotal: -
ALLOY ART Comp Cam Cover - Raw - M8 M8CC
ALLOY ART
$411.95If you're running a tight engine bay on your M8, header fitment and crankcase ventilation are constant compromises. The ALLOY ART Comp Cam Cover solves both with a low-profile design that clears larger-diameter headers and a reinforced breather port that...09402133- SKU:
- 09402133
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
$411.95 -
DRAG SPECIALTIES High Volume Oil Pump - M8 - without seal 81080
DRAG SPECIALTIES
$196.05High-performance M8 engines demand superior oil circulation to maintain consistent bearing protection and thermal stability under sustained load. This Drag Specialties high-volume pump delivers 26–31% greater feed volume and up to 46% more scavenging...09320304- SKU:
- 09320304
- Availability:
- Ships Same Business Day
- Weight:
- 2.20 LBS
$196.05
