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!
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- Price
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On Sale
ATHENA Piston Kit with Gaskets - 77.95 mm - FE250 | 250EXCF P5F0780078001A
ATHENA
MSRP: $240.10Now: $216.00Was: $240.10Whether 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 pistons combine OE-level reliability with superior...09031722- SKU:
- 09031722
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $240.10Now: $216.00Was: $240.10 -
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 precision with high-silicon aluminum alloy construction to...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: $240.10Now: $216.00Was: $240.10A 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 MC250F, FC250, or 250SXF/XCF to factory performance...09031724- SKU:
- 09031724
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
MSRP: $240.10Now: $216.00Was: $240.10 -
On Sale
ATHENA Piston Kit with Gaskets - 77.97 mm - MC250F | FC250 | 250SXF/XCF P5F0780078002B
ATHENA
MSRP: $240.10Now: $216.00Was: $240.10A 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 reliability while offering superior durability and ring...09031725- SKU:
- 09031725
- Availability:
- Ships Same Business Day
- Weight:
- 1.26 LBS
MSRP: $240.10Now: $216.00Was: $240.10 -
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 alloy, it reduces friction across the ring package while...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 while delivering measurably improved performance through...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 precision-engineered components that handle the demands of...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: $220.95Now: $199.00Was: $220.95A 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 your CRF250R to peak performance with OE-matched...09031736- SKU:
- 09031736
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $220.95Now: $199.00Was: $220.95 -
On Sale
ATHENA Piston Kit with Gaskets - 78.96 mm - CRF250R P5F0790323002B
ATHENA
MSRP: $220.95Now: $199.00Was: $220.95A 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 and performance gains you need to maximize your...09031738- SKU:
- 09031738
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
MSRP: $220.95Now: $199.00Was: $220.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - KX250F P5F0780071004A
ATHENA
MSRP: $249.95Now: $225.00Was: $249.95A 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 durability through precision engineering and advanced...09031739- SKU:
- 09031739
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $249.95Now: $225.00Was: $249.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.97 mm - KX250F P5F0780071004B
ATHENA
MSRP: $249.95Now: $225.00Was: $249.95When 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 engineered for 4-stroke off-road engines. Built using reverse...09031740- SKU:
- 09031740
- Availability:
- Ships Same Business Day
- Weight:
- 1.18 LBS
MSRP: $249.95Now: $225.00Was: $249.95 -
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 for consistent power delivery, whether you're pushing...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: $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: $220.95Qty 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: $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: $145.95 -
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
