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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- Qty in Cart
- Quantity
- Price
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ATHENA Piston Kit with Gaskets - 78.95 mm - CRF250R P5F0790319002A
ATHENA
$212.95Piston Kit with Gaskets - 78.95 mm - P5F0790319002A High-performance aluminum alloy construction for enhanced durability. Designed specifically for 4-stroke Off-Road motorcycles. Engineered with a smooth profile for optimal flame propagation...09031730- SKU:
- 09031730
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
$212.95 -
MOOSE RACING Water Pump Cover - Black - Gas Gas/Husqvarna I04-5259B
MOOSE RACING
$88.95Water Pump Cover - Black - Gas Gas/Husqvarna Made from machined 6061 Billet Aluminum for that factory racing look, Provides added durability over the stock cast OEM covers, Uses stock impeller to reduce overall cost of other expensive aftermarket covers,...09402049- SKU:
- 09402049
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$88.95 -
MOOSE RACING Clutch Cylinder Guard - Gas Gas/Husqvarna/KTM 13-1123
MOOSE RACING
$42.95Clutch Cylinder Guard - Gas Gas/Husqvarna/KTM CNC-machined aluminum is black anodized and contrast cut for stylish, functional protection, Specialized applications guard hydraulic clutch cylinders and feature knockdown bars to keep your chain in check,...09500993- SKU:
- 09500993
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
$42.95 -
MOOSE RACING Clutch Cylinder Guard - Gas Gas/KTM/Husqvarna 13-1223
MOOSE RACING
$42.95Clutch Cylinder Guard - 13-1223 CNC-machined aluminum for enhanced durability and strength Black anodized finish with contrast cut for a sleek appearance Specialized design protects hydraulic clutch cylinders effectively Includes...09500994- SKU:
- 09500994
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$42.95 -
MOOSE RACING Ignition Wire Guard - Sherco 27-9013
MOOSE RACING
$29.95Ignition Wire Guard - Sherco Provides protection from debris catching on the ignition wire above the ignition cover, Easy installation by removing top two screws for ignition cover placing over the exposed wire then re-installing screws09500995- SKU:
- 09500995
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$29.95 -
MOOSE RACING Clutch Cover - Kawasaki D70-2474MB
MOOSE RACING
$179.95Clutch Cover - Kawasaki Made from machined bullet aircraft-quality aluminum for added strength, Stronger than OEM cover, Dissipates heat better than OEM cover, Hard-coated finish for long-lasting durability09402037- SKU:
- 09402037
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$179.95 -
MOOSE RACING Clutch Cylinder Guard - Gas Gas/KTM/Husqvarna 13-1023
MOOSE RACING
$42.95Clutch Cylinder Guard - Gas Gas/KTM/Husqvarna CNC-machined aluminum is black anodized and contrast cut for stylish, functional protection, Specialized applications guard hydraulic clutch cylinders and feature knockdown bars to keep your chain in check,...09500992- SKU:
- 09500992
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
$42.95 -
On Sale
Pro Circuit Water Pump Cover with Impeller for Kawasaki KX250 2021-2024 WPK21250
PRO CIRCUIT
MSRP: $239.95Now: $211.16Was: $239.95Enhance your water pump's efficiency with our premium Water Pump Cover featuring a precision-engineered impeller. Crafted from CNC-machined billet aluminum, this cover combines strength and lightweight design to ensure long-lasting performance...09402061- SKU:
- 09402061
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
MSRP: $239.95Now: $211.16Was: $239.95 -
VINTCO Crankshaft Assembly - Honda CR2012
VINTCO
$423.95Crankshaft Assembly - Honda CR2012 Durable construction with heavy-duty forged steel for enhanced strength. Includes a high-quality wrist pin bearing for optimal performance. Precision-engineered for a perfect fit in Honda engines. ...09210926- SKU:
- 09210926
- Availability:
- Ships Same Business Day
- Weight:
- 11.00 LBS
$423.95 -
VINTCO Crankshaft Assembly - Honda CR2013
VINTCO
$423.95Crankshaft Assembly - Honda CR2013 Durable construction with heavy-duty forged steel for enhanced strength. Includes wrist pin bearing for seamless installation. Precision-engineered for optimal performance and longevity. Designed...09210927- SKU:
- 09210927
- Availability:
- Ships Same Business Day
- Weight:
- 10.93 LBS
$423.95 -
VINTCO Crankshaft Assembly - Kawasaki CR2015
VINTCO
$416.95Crankshaft Assembly - Kawasaki Assembled with a heavy duty forged steel connecting rod with the wrist pin bearing included09210928- SKU:
- 09210928
- Availability:
- Ships Same Business Day
- Weight:
- 10.73 LBS
$416.95 -
VINTCO Crankshaft Assembly - Maico CR2011
VINTCO
$416.95Crankshaft Assembly - Maico Assembled with a heavy duty forged steel connecting rod with the wrist pin bearing included09210925- SKU:
- 09210925
- Availability:
- Ships Same Business Day
- Weight:
- 11.96 LBS
$416.95 -
JE PISTONS Piston Kit 362954
JE PISTONS
$299.99Piston Kit Machined from 2618-T6 high tensile forged aluminum, Dome/ dish features smooth flowing radii; require no deburring or preparation, JE designs are specifically engineered for extreme applications including professional competition, Pins, pin...09106544- SKU:
- 09106544
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
$299.99 -
JE PISTONS Piston Kit 373034
JE PISTONS
$389.99Piston Kit 373034 Constructed from durable 2618-T6 high tensile forged aluminum for enhanced strength. Features a dome/dish design with smooth flowing radii for optimal performance. No deburring or preparation needed, ready for immediate...09106551- SKU:
- 09106551
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$389.99 -
JE PISTONS Piston Kit 373035
JE PISTONS
$389.99Piston Kit 373035 Constructed from durable 2618-T6 high tensile forged aluminum for enhanced strength. Features a dome/dish design with smooth flowing radii, eliminating the need for deburring. Engineered specifically for extreme...09106552- SKU:
- 09106552
- Availability:
- Ships Same Business Day
- Weight:
- 0.79 LBS
$389.99 -
MOOSE RACING Piston Kit - 78.00 mm - Honda MP2000C
MOOSE RACING
$326.95Piston Kit - 78.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106465- SKU:
- 09106465
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$326.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2029
MOOSE RACING
$326.95Piston Kit - 96.00 mm - MP2029 X-style forgings enhance strength and reduce friction. Designed for durability and optimal power output. Full radius dome design prevents hot spots, reducing detonation risks. Internal bracing improves...09106467- SKU:
- 09106467
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
$326.95 -
MOOSE RACING Piston Kit - 97.00 mm - Yamaha MPX1111
MOOSE RACING
$421.95Piston Kit - 97.00 mm - Yamaha Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106521- SKU:
- 09106521
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$421.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki M3023C
MOOSE RACING
$177.95Piston Kit - 77.00 mm - Kawasaki Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106470- SKU:
- 09106470
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
$177.95 -
MOOSE RACING Piston Kit - 96.00 mm - Honda MP2009
MOOSE RACING
$326.95Piston Kit - 96.00 mm - Honda Feature X-style forgings for ultimate strength, minimizing friction, durability, power, and weight reduction, Full radius dome designs maximize quench while eliminating hot spots that promote detonation, Internal bracing...09106466- SKU:
- 09106466
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
$326.95
