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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MOOSE RACING Piston Kit - 96.00 mm - Honda MPX2181B
MOOSE RACING
$421.95High-rpm stability and longevity demand pistons engineered for extreme conditions—and MOOSE Racing delivers with fully forged construction that withstands detonation while shedding unnecessary weight...09106506- SKU:
- 09106506
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
$421.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2084
MOOSE RACING
$386.95If you're building a high-revving Honda engine or refreshing worn internals, a quality piston kit is non-negotiable. The MOOSE Racing MPX2084 delivers the strength and precision necessary to handle...09106513- SKU:
- 09106513
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 79.00 mm - Honda MPX2085-P
MOOSE RACING
$516.95Honda high-performance engines demand pistons engineered to handle sustained combustion pressures and elevated RPM loads. The MOOSE RACING Piston Kit delivers the durability and thermal efficiency...09106514- SKU:
- 09106514
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
$516.95 -
MOOSE RACING Piston Kit - 77.00 mm - Kawasaki MPX3062
MOOSE RACING
$386.95When you're pushing your Kawasaki to the limit, stock pistons become your limiting factor. This MOOSE Racing piston kit delivers the strength and reliability needed for sustained high-RPM...09106515- SKU:
- 09106515
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$386.95 -
MOOSE RACING Piston Kit - 77.00 mm - Yamaha MPX1089
MOOSE RACING
$421.95If you're pushing your Yamaha to the limit, your stock piston won't cut it. This MOOSE Racing piston kit delivers the strength, reliability, and reduced friction needed to handle extreme conditions...09106517- SKU:
- 09106517
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
$421.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.75 mm - CRF250R P5F0768245001A
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95Your CRF250R's performance ceiling is limited by factory piston tolerances and ring friction losses. The ATHENA 76.75 mm piston kit replaces worn internals with precision-engineered components that...09031700- SKU:
- 09031700
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
MSRP: $214.95Now: $193.00Was: $214.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.76 mm - CRF250R P5F0768245001B
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95The ATHENA Piston Kit delivers the reliability you expect from OE specifications with measurably improved durability and performance for your CRF250R. High-silicon aluminum construction combined with...09031701- SKU:
- 09031701
- Availability:
- Ships Same Business Day
- Weight:
- 1.12 LBS
MSRP: $214.95Now: $193.00Was: $214.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.95 mm - WR/YZ250F P5F0770187009A
ATHENA
MSRP: $234.95Now: $211.00Was: $234.95When your WR/YZ250F demands reliability under extreme conditions, OE pistons hit their limits. The ATHENA Piston Kit delivers the same dependable engineering as factory components while engineering...09031712- SKU:
- 09031712
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $234.95Now: $211.00Was: $234.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.95 mm - FE250 | 250EXCF/XCFW P5F0780074001A
ATHENA
MSRP: $292.94Now: $264.00Was: $292.94If you're running a KTM 250 EXC-F or 250 EXC-F W, piston wear directly impacts compression, throttle response, and engine longevity. The ATHENA Piston Kit delivers OEM-level reliability with superior...09031720- SKU:
- 09031720
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
MSRP: $292.94Now: $264.00Was: $292.94 -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - FE250 | 250EXCF/XCFW P5F0780074001B
ATHENA
MSRP: $292.94Now: $264.00Was: $292.94When you're pushing your 250EXCF or XCFW to its limits, your piston needs to handle extreme combustion pressures without sacrificing reliability. The ATHENA Piston Kit delivers OE-level dependability...09031721- SKU:
- 09031721
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $292.94Now: $264.00Was: $292.94 -
On Sale
ATHENA Piston Kit with Gaskets - 77.95 mm - FE250 | 250EXCF P5F0780078001A
ATHENA
MSRP: $259.95Now: $216.00Was: $259.95Whether you're rebuilding a tired top-end or refreshing your FE250's compression, a quality piston kit directly impacts throttle response, fuel efficiency, and engine longevity. ATHENA's CNC-machined...09031722- SKU:
- 09031722
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $259.95Now: $216.00Was: $259.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - MC250F | FC250 | 250SXF/XCF P5F0780078002A
ATHENA
MSRP: $259.95Now: $216.00Was: $259.95A worn or damaged piston directly impacts engine compression, throttle response, and overall reliability—especially critical in high-demand off-road conditions. The ATHENA Piston Kit restores your...09031724- SKU:
- 09031724
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
MSRP: $259.95Now: $216.00Was: $259.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.97 mm - MC250F | FC250 | 250SXF/XCF P5F0780078002B
ATHENA
MSRP: $259.95Now: $216.00Was: $259.95A properly sized piston kit is critical for maintaining engine compression, combustion efficiency, and overall power output on 4-stroke off-road motorcycles. The ATHENA piston kit delivers OEM-level...09031725- SKU:
- 09031725
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
MSRP: $259.95Now: $216.00Was: $259.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.95 mm - EC250F | FE250 | 250EXCF P5F0780093001A
ATHENA
MSRP: $228.95Now: $206.00Was: $228.95Piston failures compromise engine reliability and performance—this ATHENA kit delivers OE-equivalent durability with measurably superior wear resistance. CNC-machined from high-silicon aluminum...09031726- SKU:
- 09031726
- Availability:
- Ships Same Business Day
- Weight:
- 1.24 LBS
MSRP: $228.95Now: $206.00Was: $228.95 -
On Sale
ATHENA Piston Kit with Gaskets - 78.96 mm - CRF250R P5F0790319002B
ATHENA
MSRP: $212.95Now: $192.00Was: $212.95Your CRF250R's piston is the heart of combustion efficiency—worn or low-quality units rob you of power, throttle response, and engine longevity. The ATHENA Piston Kit restores OEM-level reliability...09031731- SKU:
- 09031731
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
MSRP: $212.95Now: $192.00Was: $212.95 -
On Sale
ATHENA Piston Kit with Gaskets - 78.95 mm - CRF250R P5F0790319002A
ATHENA
MSRP: $212.95Now: $192.00Was: $212.95A worn or damaged piston directly kills your CRF250R's combustion efficiency, power output, and engine longevity. This ATHENA piston kit restores your bike to factory performance specs with...09031730- SKU:
- 09031730
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
MSRP: $212.95Now: $192.00Was: $212.95 -
MOOSE RACING Water Pump Cover - Black - Gas Gas/Husqvarna I04-5259B
MOOSE RACING
$88.95If you're running a Gas Gas or Husqvarna machine, the factory water pump cover is vulnerable to damage and heat stress during aggressive riding. This MOOSE Racing billet aluminum cover replaces that...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
$42.95Hydraulic clutch cylinders are vulnerable to impact damage during aggressive riding—a single crash can leave you stranded. This MOOSE RACING guard protects that critical component with CNC-machined...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
$42.95Hydraulic clutch cylinders are vulnerable to impact and chain strikes—damage means downtime and expensive repairs. This CNC-machined guard absorbs hits that would otherwise compromise your clutch...09500994- SKU:
- 09500994
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$42.95 -
MOOSE RACING Ignition Wire Guard - Sherco 27-9013
MOOSE RACING
$29.95Debris catching on exposed ignition wires is a common cause of misfires and electrical gremlins that can sideline your bike mid-race or trail ride. This MOOSE RACING Ignition Wire Guard shields the...09500995- SKU:
- 09500995
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$29.95
