Dirt Bike Engine Rebuild Kits
Dirt Bike Engine Rebuild Kits for Kawasaki KX100, KTM XC-W 250 & Honda CRF250R at JJ Motorsports
Revive your dirt bike's engine to factory-fresh performance with premium rebuild kits from JJ Motorsports, featuring forged pistons, crankshafts, bearings, seals, and gaskets for superior compression, reduced vibration, and long-term reliability in motocross, enduro, and trail riding. Our selection includes complete top- and bottom-end kits designed for precise fitment, optimal oil flow, and enhanced power delivery without custom machining. Compatible with popular models like Kawasaki KX100, KTM XC/XC-W 250, Husqvarna TE250, and Honda CRF250R, these high-quality components from trusted brands ensure leak-free assembly, better heat management, and race-ready durability in dusty, high-RPM conditions. From Wiseco's comprehensive KX100 kits with hour meters to Vertex's all-in-one KTM rebuilds and Athena's high-performance CRF pistons, get everything needed for a pro-level refresh—pistons, rings, bearings, and gaskets—to restore throttle snap, efficiency, and confidence on every rip.
Shop brands like Wiseco, Vertex, and Athena for race-proven quality. Explore related categories such as dirt bike piston and ring kits for top-end focus or dirt bike engine for cylinders and valves.
Top Dirt Bike Engine Rebuild Kits
- Wiseco Engine Rebuild Kit 52.50 mm Kawasaki KX100 1995-2013 PWR173-100 – Comprehensive top- and bottom-end kit with high-quality crankshaft, rod assembly, main bearings, seals, gaskets, and hour meter bracket for Kawasaki KX100 models; ensures optimal performance and easy maintenance.
- VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091 – All-in-one rebuild kit with Vertex piston, Hot Rods crankshaft, bearings/seals, transmission kit, and complete gaskets; perfect for professional top- and bottom-end refresh on KTM and Husqvarna 250cc models.
- ATHENA Piston Kit with Gaskets - 76.76 mm - CRF250R P5F0768245003B – High-performance 76.76 mm forged aluminum piston kit with rings, gaskets, and coatings for reduced friction; engineered for Honda CRF250R 4-stroke off-road with superior airflow and longevity.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
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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 - FE250 | 250EXCF P5F0780078001B
ATHENA
MSRP: $240.10Now: $216.00Was: $240.10When you're pushing your FE250 or 250EXCF to the limit, piston reliability directly impacts your power delivery and engine longevity. ATHENA's 77.96 mm piston kit combines Japanese manufacturing...09031723- SKU:
- 09031723
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $240.10Now: $216.00Was: $240.10Qty in Cart: 0Quantity:Price:MSRP: $240.10Now: $216.00Was: $240.10Subtotal: -
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: $259.95Qty in Cart: 0Quantity:Price:MSRP: $259.95Now: $216.00Was: $259.95Subtotal: -
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 -
On Sale
ATHENA Piston Kit with Gaskets - 78.95 mm - CRF250R P5F0790323002A
ATHENA
MSRP: $269.95Now: $199.00Was: $269.95A worn or damaged piston directly undermines engine efficiency, power delivery, and reliability—especially critical in off-road riding where engine stress is constant. This ATHENA Piston Kit restores...09031736- SKU:
- 09031736
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $269.95Now: $199.00Was: $269.95Qty in Cart: 0Quantity:Price:MSRP: $269.95Now: $199.00Was: $269.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 78.96 mm - CRF250R P5F0790323002B
ATHENA
MSRP: $269.95Now: $199.00Was: $269.95A worn or damaged piston directly impacts your CRF250R's compression, power delivery, and engine longevity. This ATHENA piston kit restores OE-equivalent reliability while delivering the durability...09031738- SKU:
- 09031738
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
MSRP: $269.95Now: $199.00Was: $269.95Qty in Cart: 0Quantity:Price:MSRP: $269.95Now: $199.00Was: $269.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - KX250F P5F0780071004A
ATHENA
MSRP: $289.95Now: $225.00Was: $289.95A worn or damaged piston directly impacts combustion efficiency, throttle response, and engine longevity—especially in high-demand off-road conditions. The ATHENA Piston Kit delivers OEM-exceeding...09031739- SKU:
- 09031739
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $289.95Now: $225.00Was: $289.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.97 mm - KX250F P5F0780071004B
ATHENA
MSRP: $289.95Now: $225.00Was: $289.95When your stock piston starts showing wear, combustion efficiency drops and power delivery suffers. The ATHENA Piston Kit restores—and exceeds—OE performance with a high-silicon aluminum alloy...09031740- SKU:
- 09031740
- Availability:
- Ships Same Business Day
- Weight:
- 1.18 LBS
MSRP: $289.95Now: $225.00Was: $289.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.95 mm - RMZ250 P5F0770099004A
ATHENA
MSRP: $227.95Now: $205.00Was: $227.95A worn or stock piston kit limits your RMZ250's potential for sustained high-RPM performance and reliability. This ATHENA Piston Kit delivers the precision engineering and durable materials needed...09031741- SKU:
- 09031741
- Availability:
- Ships Same Business Day
- Weight:
- 1.09 LBS
MSRP: $227.95Now: $205.00Was: $227.95Qty in Cart: 0Quantity:Price:MSRP: $227.95Now: $205.00Was: $227.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 71.93 mm - KTM P4C0720045002A
ATHENA
MSRP: $231.95Now: $199.00Was: $231.95Keep 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...09031776- SKU:
- 09031776
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
MSRP: $231.95Now: $199.00Was: $231.95Qty in Cart: 0Quantity:Price:MSRP: $231.95Now: $199.00Was: $231.95Subtotal: -
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...09031777- SKU:
- 09031777
- Availability:
- Ships Same Business Day
- Weight:
- 1.49 LBS
MSRP: $220.95Now: $199.00Was: $220.95Qty in Cart: 0Quantity:Price:MSRP: $220.95Now: $199.00Was: $220.95Subtotal: -
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: $187.95Qty in Cart: 0Quantity:Price:MSRP: $187.95Now: $161.00Was: $187.95Subtotal: -
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 - 66.35 mm - Yamaha P4F0664267019B
ATHENA
MSRP: $220.95Now: $189.00Was: $220.95When 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...09031785- SKU:
- 09031785
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $220.95Now: $189.00Was: $220.95Qty in Cart: 0Quantity:Price:MSRP: $220.95Now: $189.00Was: $220.95Subtotal: -
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: $153.95Qty in Cart: 0Quantity:Price:MSRP: $153.95Now: $131.00Was: $153.95Subtotal: -
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
