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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On Sale
ATHENA Piston Kit with Gaskets - 66.34 mm - KTM P4C0664083001A
ATHENA
MSRP: $187.95Now: $161.00Was: $187.95For 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...09031778- SKU:
- 09031778
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
MSRP: $187.95Now: $161.00Was: $187.95 -
On Sale
ATHENA Piston Kit with Gaskets - 66.34 mm - KTM P4C0664045001A
ATHENA
MSRP: $187.95Now: $161.00Was: $187.95When 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...09031780- SKU:
- 09031780
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
MSRP: $187.95Now: $161.00Was: $187.95 -
On Sale
ATHENA Piston Kit with Gaskets - 66.34 mm - Yamaha P4F0664267019A
ATHENA
MSRP: $220.95Now: $189.00Was: $220.95A 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...09031784- SKU:
- 09031784
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $220.95Now: $189.00Was: $220.95 -
On Sale
ATHENA Piston Kit with Gaskets - 53.95 mm - Yamaha P4C0540118014A
ATHENA
MSRP: $153.95Now: $131.00Was: $153.95Maintaining 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...09031786- SKU:
- 09031786
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
MSRP: $153.95Now: $131.00Was: $153.95 -
On Sale
BOLT Cylinder and Head Nut Universal Kit - 2 Stroke 2STK-HDNUT
BOLT
MSRP: $14.99Now: $13.49Was: $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...09501032- SKU:
- 09501032
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
MSRP: $14.99Now: $13.49Was: $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...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...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...09501028- SKU:
- 09501028
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
$72.95 -
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...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...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...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...09250373- SKU:
- 09250373
- Availability:
- Ships Same Business Day
- Weight:
- 0.39 LBS
MSRP: $77.95Now: $64.00Was: $77.95 -
VERTEX Engine Rebuild Kit - Husqvarna | KTM WR00073
VERTEX
$1,287.25A 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...09031806- SKU:
- 09031806
- Availability:
- Ships Same Business Day
- Weight:
- 14.52 LBS
$1,287.25 -
On Sale
BOLT Oil Change Hardware Kit - Gas Gas/Husqvarna/KTM OILCHG-EUR
BOLT
MSRP: $7.99Now: $7.19Was: $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...07120672- SKU:
- 07120672
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
MSRP: $7.99Now: $7.19Was: $7.99 -
MOOSE RACING Clutch Cover - Sherco D70-5440MB
MOOSE RACING
$169.95Your Sherco's clutch cover takes constant abuse from heat cycles and impact—OEM aluminum simply isn't engineered to handle sustained high-performance demands. This MOOSE Racing cover replaces it with...09402187- SKU:
- 09402187
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
$169.95 -
MOOSE RACING Clutch Cover - Yamaha D70-4427MB
MOOSE RACING
$220.95Your clutch cover endures extreme heat and mechanical stress on every ride—stock aluminum simply won't cut it if you're pushing performance. MOOSE Racing's aircraft-grade aluminum cover handles the...09402188- SKU:
- 09402188
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$220.95 -
MOOSE RACING Clutch Cover - Gas Gas/Husqvarna/KTM D70-5441MB
MOOSE RACING
$199.95A stock clutch cover can't handle the demands of aggressive riding or racing conditions—it warps under heat, fails prematurely, and compromises your bike's reliability when you need it most. The...09402189- SKU:
- 09402189
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
$199.95 -
MOOSE RACING Ignition Cover - Husqvarna/KTM D70-5486MB
MOOSE RACING
$329.95Your ignition cover takes constant abuse from heat cycles, debris, and vibration—stock covers crack, warp, and fail at the worst possible moments. The MOOSE RACING Ignition Cover replaces that weak...09402190- SKU:
- 09402190
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$329.95 -
MOOSE RACING Ignition Cover - Yamaha D70-4477MB
MOOSE RACING
$345.95Your ignition cover takes constant heat cycles and mechanical stress—stock Yamaha covers often crack or degrade under sustained performance use. The MOOSE RACING D70-4477MB replaces that...09402191- SKU:
- 09402191
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
$345.95 -
MOOSE RACING Ignition Cover - Yamaha D70-4476MB
MOOSE RACING
$172.95Your stock ignition cover is compromising both cooling efficiency and long-term durability. This MOOSE RACING billet aluminum replacement dissipates heat more effectively while delivering superior...09402192- SKU:
- 09402192
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
$172.95
