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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
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On Sale
PROX Crankshaft Bearing/Seal Kit - Gas Gas/Husqvarna/KTM 23.CBS63017
PROX
MSRP: $169.95Now: $136.00Was: $169.95A worn crankshaft bearing or degraded seal compromises engine reliability and can lead to catastrophic internal damage. This OEM-specification kit delivers complete bearing and seal replacement, restoring your engine's structural integrity and oil...09240707- SKU:
- 09240707
- Availability:
- Ships Same Business Day
- Weight:
- 1.03 LBS
MSRP: $169.95Now: $136.00Was: $169.95 -
On Sale
ATHENA Piston Kit with Gaskets - 71.93 mm - KTM P4C0720045002A
ATHENA
MSRP: $220.95Now: $199.00Was: $220.95Keep your 2-stroke off-road machine running at peak performance with a piston kit engineered for reliability and durability. The ATHENA Piston Kit delivers the same dependability as OE components while offering superior resistance to wear and detonation,...09031776- SKU:
- 09031776
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
MSRP: $220.95Now: $199.00Was: $220.95 -
On Sale
ATHENA Piston Kit with Gaskets - 71.94 mm - KTM P4C0720045002B
ATHENA
MSRP: $220.95Now: $199.00Was: $220.952-stroke off-road engines demand precision components that survive extreme combustion pressures and repeated thermal cycling. The ATHENA Piston Kit delivers OE-equivalent reliability while improving ring sealing and reducing friction—critical upgrades...09031777- SKU:
- 09031777
- Availability:
- Ships Same Business Day
- Weight:
- 1.49 LBS
MSRP: $220.95Now: $199.00Was: $220.95 -
On Sale
ATHENA Piston Kit with Gaskets - 66.34 mm - KTM P4C0664083001A
ATHENA
MSRP: $178.95Now: $161.00Was: $178.95For 2-stroke off-road engines, piston reliability directly impacts your power delivery and engine longevity. The ATHENA Piston Kit delivers OE-equivalent durability with enhanced performance characteristics, thanks to its high-silicon aluminum alloy...09031778- SKU:
- 09031778
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
MSRP: $178.95Now: $161.00Was: $178.95 -
On Sale
ATHENA Piston Kit with Gaskets - 66.34 mm - KTM P4C0664045001A
ATHENA
MSRP: $178.95Now: $161.00Was: $178.95When you're pushing a 2-stroke off-road engine to its limits, piston failure isn't an option. The ATHENA Piston Kit delivers OEM-level reliability with enhanced durability through precision CNC manufacturing and high-silicon aluminum construction. This...09031780- SKU:
- 09031780
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
MSRP: $178.95Now: $161.00Was: $178.95 -
On Sale
ATHENA Piston Kit with Gaskets - 66.34 mm - Yamaha P4F0664267019A
ATHENA
MSRP: $209.95Now: $189.00Was: $209.95A quality piston kit is fundamental to maintaining peak performance and reliability in high-demand 2-stroke engines. The ATHENA Piston Kit delivers OE-equivalent durability while leveraging advanced materials and precision manufacturing to reduce...09031784- SKU:
- 09031784
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $209.95Now: $189.00Was: $209.95 -
On Sale
ATHENA Piston Kit with Gaskets - 66.35 mm - Yamaha P4F0664267019B
ATHENA
MSRP: $209.95Now: $189.00Was: $209.95When your 2-stroke off-road engine demands reliability under extreme conditions, OE pistons often fall short on durability and performance. The ATHENA Piston Kit delivers the same factory-level dependability with superior material composition and...09031785- SKU:
- 09031785
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $209.95Now: $189.00Was: $209.95 -
On Sale
ATHENA Piston Kit with Gaskets - 53.95 mm - Yamaha P4C0540118014A
ATHENA
MSRP: $145.95Now: $131.00Was: $145.95Maintaining proper piston and gasket sealing is critical to preserving compression, fuel efficiency, and power output in 2-stroke off-road engines. This ATHENA kit delivers OE-equivalent reliability with the added durability benefit of high-silicon...09031786- SKU:
- 09031786
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $145.95Now: $131.00Was: $145.95Qty in Cart: 0Quantity:Price:MSRP: $145.95Now: $131.00Was: $145.95Subtotal: -
BOLT Cylinder and Head Nut Universal Kit - 2 Stroke 2STK-HDNUT
BOLT
$14.99Securing your two-stroke top end requires hardware that won't fail under combustion pressure and high RPM loads. This universal kit eliminates the frustration of sourcing individual fasteners by delivering everything you need for cylinder and head...09501032- SKU:
- 09501032
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$14.99 -
Hinson Racing Clutch Cover for 2023-2024 KTM 250 SX-F CA480-2301
HINSON RACING
$179.99The stock clutch cover on your 2023-2024 KTM 250 SX-F CA will struggle under sustained racing conditions, leading to heat buildup and potential clutch degradation. The Hinson Racing Clutch Cover CA480-2301 solves this with aerospace-grade T-6 aluminum...09402112- SKU:
- 09402112
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$179.99 -
Hinson Racing Clutch Cover for 2020 KTM 250 SX-F CA420-2301
HINSON RACING
$169.99Stock clutch covers fail under sustained track heat and aggressive riding conditions. The Hinson Racing Clutch Cover replaces weak OEM components with billet T-6 aluminum construction, delivering superior heat dissipation and reliability when it matters...09402113- SKU:
- 09402113
- Availability:
- Ships Same Business Day
- Weight:
- 0.62 LBS
$169.99 -
MOOSE RACING Clutch Slave Cylinder Rebuild Kit - Husqvarna/KTM 18-6043
MOOSE RACING
$72.95A leaking clutch slave cylinder compromises both safety and performance, causing spongy lever feel and unpredictable clutch engagement during aggressive riding. This complete rebuild kit from MOOSE Racing eliminates the need for costly replacement units,...09501028- SKU:
- 09501028
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
$72.95Qty in Cart: 0Quantity:Price:$72.95Subtotal: -
On Sale
PROX Cam Chain - 92RH2015 - 104 Links - Gas Gas | Honda | Husqvarna | KTM | Sherco 31.1335
PROX
MSRP: $99.95Now: $68.00Was: $99.95A compromised cam chain directly impacts engine timing precision and reliability—especially critical in high-demand racing and off-road applications. The PROX 92RH2015 is engineered to OEM specifications with Borg Warner's Japanese manufacturing...09250355- SKU:
- 09250355
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
MSRP: $99.95Now: $68.00Was: $99.95 -
On Sale
PROX Cam Chain - 82RH2015 - 102 Links - Honda 31.1384
PROX
MSRP: $82.95Now: $68.00Was: $82.95A worn or damaged cam chain compromises valve timing precision and can lead to catastrophic engine damage if it breaks. The PROX 82RH2015 is engineered to OEM specifications and manufactured by Borg Warner in Japan, delivering the durability and...09250356- SKU:
- 09250356
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
MSRP: $82.95Now: $68.00Was: $82.95 -
On Sale
PROX Cam Chain - 82RH2010 - 112 Links - Honda 31.1496
PROX
MSRP: $99.95Now: $64.00Was: $99.95A worn or failing cam chain compromises valve timing precision, leading to reduced power output, increased emissions, and potential engine damage. The PROX 82RH2010 is engineered to OEM specifications and manufactured by Borg Warner in Japan, delivering...09250362- SKU:
- 09250362
- Availability:
- Ships Same Business Day
- Weight:
- 0.37 LBS
MSRP: $99.95Now: $64.00Was: $99.95 -
On Sale
PROX Cam Chain - 92RH2010 - 114 Links - Gas Gas | Kawasaki | Suzuki | Yamaha 31.2402
PROX
MSRP: $77.95Now: $64.00Was: $77.95A worn or damaged cam chain compromises valve timing precision and can lead to catastrophic engine failure. The PROX 92RH2010 is engineered to OEM specifications with advanced metallurgy and pin construction, delivering the reliability your engine...09250373- SKU:
- 09250373
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
MSRP: $77.95Now: $64.00Was: $77.95 -
On Sale
PROX Cam Chain - 82RH2010 - 128 Links - Gas Gas | Kawasaki | Suzuki 31.3403
PROX
MSRP: $88.95Now: $72.00Was: $88.95A worn or damaged cam chain directly compromises engine timing and reliability—especially critical on high-performance or frequently ridden machines. The PROX 82RH2010 is engineered to OEM specifications with advanced metallurgy and pin construction,...09250388- SKU:
- 09250388
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
MSRP: $88.95Now: $72.00Was: $88.95Qty in Cart: 0Quantity:Price:MSRP: $88.95Now: $72.00Was: $88.95Subtotal: -
VERTEX Engine Rebuild Kit - Husqvarna | KTM WR00073
VERTEX
$1,225.95A complete engine rebuild requires precision components working in perfect harmony—and sourcing quality parts individually creates delays and compatibility risks. The VERTEX Engine Rebuild Kit consolidates nearly every component you need into one tested,...09031806- SKU:
- 09031806
- Availability:
- Ships Same Business Day
- Weight:
- 14.52 LBS
$1,225.95 -
VERTEX Engine Rebuild Kit - KTM WR00069
VERTEX
$1,225.95A complete engine rebuild demands precision and reliability—cutting corners on component quality will compromise performance and longevity. The VERTEX Engine Rebuild Kit for KTM consolidates nearly every critical internal component into one carefully...09031804- SKU:
- 09031804
- Availability:
- Ships Same Business Day
- Weight:
- 14.52 LBS
$1,225.95 -
BOLT Oil Change Hardware Kit - Gas Gas/Husqvarna/KTM OILCHG-EUR
BOLT
$7.99Proper oil change sealing is critical to maintaining pressure integrity and preventing leaks that compromise engine performance and longevity. This hardware kit ensures you have genuine, OEM-quality components for a complete seal every service interval,...07120672- SKU:
- 07120672
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
$7.99
