Dirt Bike Engine
Dirt Bike Engine Parts at JJ Motorsports
Discover a full range of dirt bike engine components for rebuilding or upgrading your performance from JJ Motorsports. From crankshafts to cylinder heads and piston kits, these precision-engineered components ensure reliable performance. For additional upgrades, check out our full selection of off-road dirt bike parts to keep your engine running at peak efficiency on the track or trails.
Shop trusted brands like Wiseco for forged piston kits and K&N for high-flow oil filters. Explore related categories such as Dirt Bike Air and Fuel for intake upgrades or Dirt Bike Exhaust for complete systems.
Browse our in-stock inventory below with same-day shipping and expert support. Questions? Contact us for fitment advice!
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- Price
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VERTEX Piston Kit - 99.95 mm - KTM 23417B
VERTEX
$331.95A quality piston kit is the foundation of reliable engine performance, especially in high-demand racing and off-road applications. The VERTEX 99.95 mm piston kit delivers the durability and power gains your KTM engine needs, combining precision forging...09102627- SKU:
- 09102627
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
$331.95 -
VESRAH Oil Filter - Kawasaki/Suzuki SF-3012
VESRAH
$7.00Engine protection hinges on filtration quality—contamination and particle buildup reduce oil flow, increase wear, and shorten engine life. The VESRAH SF-3012 uses premium filter media to capture microscopic particles before they reach critical engine...07120026- SKU:
- 07120026
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$7.00 -
On Sale
Wiseco Piston Kit 54.00 mm KTM 125 SX 2001-2024 RE904M05400
WISECO
MSRP: $221.95Now: $174.00Was: $221.95KTM 125 SX engines demand precision internals to handle the demands of competitive riding and high-RPM operation. This Wiseco piston kit delivers the durability and reliability you need to keep your engine running strong across multiple seasons without...09105086- SKU:
- 09105086
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
MSRP: $221.95Now: $174.00Was: $221.95 -
On Sale
Wiseco Piston Kit 95mm for KTM 520 EXC 2000-2002 PK1851
WISECO
MSRP: $403.95Now: $314.00Was: $403.95A worn or damaged piston kit will rob your KTM 520 EXC of power, efficiency, and reliability—especially if you're pushing hard on the track or trail. This Wiseco PK1851 kit gives you factory-matched components engineered for KTM's displacement and...09031162- SKU:
- 09031162
- Availability:
- Ships Same Business Day
- Weight:
- 1.84 LBS
MSRP: $403.95Now: $314.00Was: $403.95 -
On Sale
Wiseco Piston Kit 77.00mm Kawasaki KX250F 2006 13.5:1 Compression 4904M07700
WISECO
MSRP: $224.95Now: $191.00Was: $224.95A worn or damaged piston directly kills engine efficiency and can lead to catastrophic failure under load—especially critical for KX250F riders pushing their bikes hard on track or trail. Wiseco's forged piston kit delivers the precision engineering and...09101670- SKU:
- 09101670
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
MSRP: $224.95Now: $191.00Was: $224.95 -
On Sale
WISECO Piston Kit with Gaskets - 68.00 mm - Yamaha WR/YZ 250 PK1563
WISECO
MSRP: $275.95Now: $221.00Was: $275.95A worn or damaged top-end forces catastrophic engine failure and sidelined race time. The WISECO Piston Kit delivers OEM-quality reliability with precision-engineered components matched specifically to your Yamaha WR/YZ 250, ensuring consistent...09030716- SKU:
- 09030716
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
MSRP: $275.95Now: $221.00Was: $275.95 -
On Sale
Wiseco Piston Kit 95.00 mm Yamaha YFZ450R 2009-2019 RE819M09500
WISECO
MSRP: $243.95Now: $204.00Was: $243.95When you're running stock pistons in your YFZ450R, you're leaving horsepower on the table and risking catastrophic engine failure under sustained load or aggressive riding. The Wiseco 95.00 mm forged piston kit delivers the strength-to-weight ratio and...09100373- SKU:
- 09100373
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
MSRP: $243.95Now: $204.00Was: $243.95 -
WORKS CONNECTION Engine Plug - Blue - Gas Gas/Husqvarna/KTM 24-450
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and deterioration, compromising both aesthetics and reliability on your high-performance machine. These WORKS CONNECTION plugs deliver the precision fit and durability your two-stroke demands, while the anodized...09500977- SKU:
- 09500977
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
$30.95 -
WORKS CONNECTION Engine Plug - Red - Gas Gas/Husqvarna/KTM 24-451
WORKS CONNECTION
$30.95Stock engine plugs invite vibration, corrosion, and a cluttered engine bay. WORKS CONNECTION's precision-machined aluminum plugs deliver a clean aesthetic while protecting critical engine ports with reliable, long-lasting construction. The simple Allen...09500978- SKU:
- 09500978
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
$30.95 -
On Sale
WORKS CONNECTION Engine Plug - Black - Gas Gas/Husqvarna/KTM 24-452
WORKS CONNECTION
MSRP: $30.95Now: $21.00Was: $30.95Stock engine plugs are vulnerable to damage and corrosion, compromising both aesthetics and reliability on your off-road machine. These precision-machined WORKS CONNECTION plugs deliver a factory-quality replacement with a refined look that complements...09500979- SKU:
- 09500979
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
MSRP: $30.95Now: $21.00Was: $30.95 -
WORKS CONNECTION Engine Plug - Orange - Gas Gas/Husqvarna/KTM 24-453
WORKS CONNECTION
$30.95Stock engine plugs are prone to corrosion and can detract from your bike's appearance—especially if you've invested in premium components elsewhere. These WORKS CONNECTION plugs deliver both aesthetic upgrade and functional reliability, with...09500980- SKU:
- 09500980
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$30.95 -
WORKS CONNECTION Engine Plug - Silver - Gas Gas/Husqvarna/KTM 24-454
WORKS CONNECTION
$29.95Stock engine plugs are prone to corrosion and can detract from an otherwise refined build. These WORKS CONNECTION plugs replace worn or damaged originals with precision-machined aluminum components that deliver both durability and a polished aesthetic...09500981- SKU:
- 09500981
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$29.95 -
WORKS CONNECTION Radiator Drain Plug - Blue - Honda/Kawasaki 24-630
WORKS CONNECTION
$22.95The stock plastic radiator drain plug is a weak point in your cooling system—repeated thermal cycles and vibration will eventually cause it to crack or strip, leaving you stranded with a catastrophic coolant leak. The WORKS CONNECTION billet aluminum...09500982- SKU:
- 09500982
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$22.95 -
WORKS CONNECTION Radiator Drain Plug - Red - Honda/Kawasaki 24-631
WORKS CONNECTION
$22.95Stock plastic radiator drain plugs fail—especially under track conditions or routine maintenance cycles. The WORKS CONNECTION Radiator Drain Plug replaces that weak point with a CNC-machined billet aluminum component built to last the life of your...09500983- SKU:
- 09500983
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$22.95 -
WORKS CONNECTION Radiator Drain Plug - Silver - Honda/Kawasaki 24-634
WORKS CONNECTION
$23.95Stock plastic radiator drain plugs are prone to cracking and leaking under thermal stress—a problem that can compromise your cooling system and derail race day. The WORKS CONNECTION billet aluminum drain plug replaces that weak link with a...09500986- SKU:
- 09500986
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$23.95 -
Wossner Piston Ring 72.50mm for 1999-2006 Polaris 500 Classic RSB7250
WOSSNER
$18.50Worn or damaged piston rings are a direct threat to engine compression, power output, and fuel efficiency—especially critical in 2-stroke engines where ring sealing directly impacts performance. The Wossner RSB7250 is engineered to restore proper...09120736- SKU:
- 09120736
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$18.50 -
Wossner Universal Small End Bearing 16 mm x 20 mm x 19.5 mm N1013
WOSSNER
$18.50Small-end bearing wear is one of the most common failure points in high-performance engine builds, leading to catastrophic rod failure if left unchecked. The Wossner N1013 is a precision needle bearing engineered to handle the extreme radial loads and...09240452- SKU:
- 09240452
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$18.50 -
VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091
VERTEX
$1,013.95When your KTM XC/XC-W 250 or Husqvarna TE250 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates guesswork—you get every critical component in one box instead of chasing down parts individually. The VERTEX Engine...09031066- SKU:
- 09031066
- Availability:
- Ships Same Business Day
- Weight:
- 15.20 LBS
$1,013.95 -
MOOSE OFFROAD Cylinder - 66.40 mm - Yamaha MSE20009
MOOSE OFFROAD
$597.95A worn or damaged cylinder compromises ring seal, increases blowby, and degrades power output—issues that ripple through your entire engine. This MOOSE OFFROAD cylinder restores your Yamaha to OEM specifications with a precision-honed bore and advanced...09311074- SKU:
- 09311074
- Availability:
- Ships Same Business Day
- Weight:
- 6.15 LBS
$597.95 -
HOT RODS Crankshaft - OEM Stroke - Polaris HR00046
HOT RODS
$1,104.95If you're running a Polaris engine that demands reliability on the track or trail, a properly balanced crankshaft is non-negotiable—it's the foundation that keeps your entire rotating assembly in harmony. This OEM-stroke HOT RODS replacement eliminates...09210888- SKU:
- 09210888
- Availability:
- Ships Same Business Day
- Weight:
- 19.65 LBS
$1,104.95
