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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- Qty in Cart
- Quantity
- Price
- Subtotal
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KIBBLEWHITE Piston System 80-81200
KIBBLEWHITE
$732.91If you're serious about maximizing compression without compromising reliability, the KIBBLEWHITE Piston System 80-81200 is engineered to deliver exactly that. The convex valve reliefs are precisely matched to your valve geometry, eliminating clearance...09031304- SKU:
- 09031304
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
$732.91Qty in Cart: 0Quantity:Price:$732.91Subtotal: -
On Sale
Wiseco Engine Rebuild Kit 52.50 mm Kawasaki KX100 1995-2013 PWR173-100
WISECO
MSRP: $588.95Now: $484.00Was: $588.95A worn or damaged KX100 engine doesn't just rob you of power—it compromises reliability when you need it most. The Wiseco PWR173-100 rebuild kit gives you factory-engineered components designed to restore your engine to peak performance, whether you're...09031681- SKU:
- 09031681
- Availability:
- Ships Same Business Day
- Weight:
- 7.85 LBS
MSRP: $588.95Now: $484.00Was: $588.95Qty in Cart: 0Quantity:Price:MSRP: $588.95Now: $484.00Was: $588.95Subtotal: -
VERTEX Engine Rebuild Kit - KTM 250 SXF/CXF WR101-160
VERTEX
$1,315.95A complete engine rebuild demands precision components that restore your KTM 250 SXF/CXF to factory specifications—and this VERTEX kit delivers exactly that. Rather than sourcing individual components from multiple suppliers, this comprehensive kit...09031261- SKU:
- 09031261
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
$1,315.95 -
VERTEX Engine Rebuild Kit - KTM XC/XC-W 250 | Husqvarna TE250 WR101-091
VERTEX
$1,013.95When your KTM XC/XC-W 250 or Husqvarna TE250 engine reaches the end of its service life, a quality rebuild kit saves time and eliminates guesswork—you get every critical component in one box instead of chasing down parts individually. The VERTEX Engine...09031066- SKU:
- 09031066
- Availability:
- Ships Same Business Day
- Weight:
- 15.20 LBS
$1,013.95 -
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 restore compression, reduce parasitic drag, and deliver...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 CNC precision manufacturing ensures consistent...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 - 76.75 mm - CRF250R P5F0768245002A
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95When your CRF250R demands more power and reliability, OEM pistons fall short. This ATHENA piston kit delivers the precision engineering and durability required for serious trail performance and extended service intervals. Built with high-silicon aluminum...09031702- SKU:
- 09031702
- Availability:
- Ships Same Business Day
- Weight:
- 1.09 LBS
MSRP: $214.95Now: $193.00Was: $214.95Qty in Cart: 0Quantity:Price:MSRP: $214.95Now: $193.00Was: $214.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.75 mm - CRF250R P5F0768245003A
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95When your CRF250R's stock piston reaches its limits, you need a direct replacement that restores lost compression and reliability without compromise. The ATHENA 76.75 mm piston kit delivers the precision engineering and durability required for consistent...09031704- SKU:
- 09031704
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $214.95Now: $193.00Was: $214.95Qty in Cart: 0Quantity:Price:MSRP: $214.95Now: $193.00Was: $214.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.76 mm - CRF250R P5F0768245003B
ATHENA
MSRP: $214.95Now: $193.00Was: $214.95A worn or damaged piston directly impacts engine efficiency, throttle response, and overall reliability—especially in demanding off-road conditions. The ATHENA Piston Kit restores your CRF250R to factory specifications with OEM-quality construction and...09031705- SKU:
- 09031705
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
MSRP: $214.95Now: $193.00Was: $214.95Qty in Cart: 0Quantity:Price:MSRP: $214.95Now: $193.00Was: $214.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.97 mm - WR/YZ250F P5F0770039007B
ATHENA
MSRP: $222.95Now: $201.00Was: $222.95Piston reliability directly impacts engine longevity and peak performance—especially in high-stress off-road riding conditions. The ATHENA 76.97 mm piston kit delivers OE-equivalent durability while engineering superior heat resistance and reduced...09031707- SKU:
- 09031707
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $222.95Now: $201.00Was: $222.95Qty in Cart: 0Quantity:Price:MSRP: $222.95Now: $201.00Was: $222.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.96 mm - RMZ250 P5F0770098004B
ATHENA
MSRP: $218.95Now: $197.00Was: $218.95If you're running a RMZ250 and want to restore peak combustion efficiency and ring seal integrity, this OEM-equivalent piston kit delivers the durability of factory parts with measurably better performance characteristics. The high-silicon aluminum alloy...09031709- SKU:
- 09031709
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
MSRP: $218.95Now: $197.00Was: $218.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.96 mm - WR/YZ250F/YZ250FX P5F0770187008A
ATHENA
MSRP: $234.95Now: $211.00Was: $234.95When you're pushing your WR or YZ250F to the limit, your piston is working harder than any other component in the engine. ATHENA's 76.96mm piston kit delivers the reliability of OEM engineering with measurably better durability and performance—keeping...09031710- SKU:
- 09031710
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
MSRP: $234.95Now: $211.00Was: $234.95Qty in Cart: 0Quantity:Price:MSRP: $234.95Now: $211.00Was: $234.95Subtotal: -
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 in superior durability and ring seal efficiency—critical...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 - 76.96 mm - WR/YZ250F P5F0770187009B
ATHENA
MSRP: $234.95Now: $211.00Was: $234.95Your WR/YZ250F demands a piston kit that can handle aggressive riding conditions without compromising reliability. This ATHENA piston kit delivers the precision engineering and durability you need to maintain consistent power delivery and engine...09031713- SKU:
- 09031713
- Availability:
- Ships Same Business Day
- Weight:
- 1.11 LBS
MSRP: $234.95Now: $211.00Was: $234.95Qty in Cart: 0Quantity:Price:MSRP: $234.95Now: $211.00Was: $234.95Subtotal: -
On Sale
ATHENA Piston Kit with Gaskets - 76.95 mm - YZ250F P5F0770212009A
ATHENA
MSRP: $217.95Now: $196.00Was: $217.95When you're pushing your YZ250F to its limits, stock pistons become your weak point—compromising power delivery and ring seal integrity under sustained high RPM. The ATHENA Piston Kit delivers the durability and precision of OE engineering with...09031714- SKU:
- 09031714
- Availability:
- Ships Same Business Day
- Weight:
- 1.19 LBS
MSRP: $217.95Now: $196.00Was: $217.95 -
On Sale
ATHENA Piston Kit with Gaskets - 76.96 mm - YZ250F P5F0770212009B
ATHENA
MSRP: $217.95Now: $196.00Was: $217.95Stock pistons wear, lose compression, and rob your YZ250F of power. The ATHENA Piston Kit delivers OE reliability with superior durability and performance gains through precision engineering and advanced materials. If you're rebuilding top-end or...09031715- SKU:
- 09031715
- Availability:
- Ships Same Business Day
- Weight:
- 1.17 LBS
MSRP: $217.95Now: $196.00Was: $217.95 -
On Sale
ATHENA Piston Kit with Gaskets - 77.95 mm - FC250 | 250SXF/XCF P5F0780063001A
ATHENA
MSRP: $287.10Now: $258.00Was: $287.10When your 250SXF/XCF demands peak piston performance, OE-equivalent reliability isn't enough—you need the durability and precision that keeps your engine performing lap after lap. The ATHENA Piston Kit delivers CNC-machined, high-silicon aluminum...09031716- SKU:
- 09031716
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
MSRP: $287.10Now: $258.00Was: $287.10 -
On Sale
ATHENA Piston Kit with Gaskets - 77.96 mm - KX250F P5F0780069003A
ATHENA
MSRP: $231.95Now: $209.00Was: $231.95OEM reliability without the OEM price—this CNC-machined piston kit delivers factory-grade performance for your KX250F with measurably better durability and ring efficiency. The high-silicon aluminum alloy resists wear longer than standard pistons, while...09031718- SKU:
- 09031718
- Availability:
- Ships Same Business Day
- Weight:
- 1.20 LBS
MSRP: $231.95Now: $209.00Was: $231.95Qty in Cart: 0Quantity:Price:MSRP: $231.95Now: $209.00Was: $231.95Subtotal: -
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 material science—meaning you get stronger performance...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 while offering superior durability and performance...09031721- SKU:
- 09031721
- Availability:
- Ships Same Business Day
- Weight:
- 1.16 LBS
MSRP: $292.94Now: $264.00Was: $292.94
