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!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
VERTEX Piston Kit 23378B
VERTEX
$271.95Whether you're rebuilding a tired engine or upgrading to higher compression, the VERTEX Piston Kit 23378B delivers the durability and precision needed for sustained high-RPM performance. The combination of advanced heat treatment, molybdenum-coated...09102099- SKU:
- 09102099
- Availability:
- Ships Same Business Day
- Weight:
- 1.07 LBS
- DISPLACEMENT:
- 450 CC
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- FORGED HIGH COMPRESSION
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 95.97 MM
- COMPRESSION RATIO IMPERIAL:
- 12.9:1
- CYLINDER DIAMETER METRIC:
- 96.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$271.95 -
VERTEX Piston Kit 23198B
VERTEX
$289.95The VERTEX Piston Kit 23198B delivers the durability and precision needed for high-rpm engine demands, whether you're rebuilding after wear or upgrading for peak performance. Built with heat-treated aluminum and a molybdenum disulfide coating, these...09102091- SKU:
- 09102091
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$289.95 -
VERTEX Piston Kit - Standard 22712B
VERTEX
$158.95The VERTEX Piston Kit 22712B delivers the durability and precision your engine demands, whether you're building a street machine or prepping for the track. Heat-treated to withstand extreme combustion pressures and temperatures, these pistons feature a...09101056- SKU:
- 09101056
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- DISPLACEMENT:
- 125 CC
$158.95 -
VERTEX Piston Kit - Standard 22499B
VERTEX
$118.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Standard 22499B delivers the durability and precision required for both street and track applications. The advanced T-5 heat treatment and molybdenum disulfide coating...09101023- SKU:
- 09101023
- Availability:
- Ships Same Business Day
- Weight:
- 0.28 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 46.95 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- CYLINDER DIAMETER METRIC:
- 47.00 MM
- DISPLACEMENT:
- 80 CC
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$118.95 -
VERTEX Piston Kit 23379B
VERTEX
$302.95High-revving engines demand pistons engineered for sustained performance under extreme conditions. The VERTEX Piston Kit 23379B combines advanced metallurgy with precision surface coatings to deliver reliable power delivery and extended component life...09101012- SKU:
- 09101012
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
$302.95 -
VERTEX Piston Kit 22925B
VERTEX
$242.95Piston failure is one of the most costly engine catastrophes—and the VERTEX Piston Kit 22925B eliminates the guesswork with OEM-quality construction and race-proven durability. The combination of precision heat treatment and low-friction coating means...09100992- SKU:
- 09100992
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- CYLINDER DIAMETER METRIC:
- 64.00 MM
- DISPLACEMENT:
- 200 CC
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 63.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$242.95 -
On Sale
ATHENA Piston Kit S5F08300005B
ATHENA
MSRP: $256.95Now: $231.00Was: $256.95Whether you're rebuilding a high-revving two-stroke or fortifying a four-stroke engine, piston quality directly impacts power delivery, longevity, and reliability under extreme conditions. The ATHENA Piston Kit S5F08300005B delivers the precision and...09100884- SKU:
- 09100884
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- B
- BORE SIZE METRIC:
- 82.96 MM
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $256.95Now: $231.00Was: $256.95 -
On Sale
ATHENA Piston Kit S4F06900001A
ATHENA
MSRP: $162.95Now: $147.00Was: $162.95Maximum engine longevity and consistent peak performance demand pistons engineered to the exact tolerances of professional racing applications. The ATHENA Piston Kit S4F06900001A delivers the same material science trusted in Formula 1 competition,...09100168- SKU:
- 09100168
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- DISPLACEMENT:
- 220 CC
- TYPE:
- A
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 68.94 MM
- PISTON HEAD SHAPE:
- DOMED
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- STOCK
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
MSRP: $162.95Now: $147.00Was: $162.95 -
Wiseco 4-Stroke Forged Piston Kit 95mm 11:1 CR for KTM 520 EXC 2000-2002 520 SX 2000-2002 525 SX 2003-2006 525 XC 2008-2010 PK1850
WISECO
$392.95If you're rebuilding a KTM 4-stroke or pushing your bike to competitive limits, piston quality directly impacts engine longevity and throttle response. The Wiseco PK1850 pairs aerospace-grade forged aluminum with precision engineering to deliver the...09031161- SKU:
- 09031161
- Availability:
- Ships Same Business Day
- Weight:
- 1.80 LBS
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE SIZE METRIC:
- 95.00 MM
- MODEL:
- FORGED SERIES
- STROKE LENGTH METRIC:
- 72.00 MM
- DISPLACEMENT:
- 510 CC
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 11.0:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 94.92 MM
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$392.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 1992-2002 Honda CR80R WR101-010
WRENCH RABBIT
$526.95A complete engine rebuild demands precision components that work together seamlessly—and this Wrench Rabbit kit delivers exactly that. Whether you're restoring a worn CR80R or preparing for competitive riding, having OEM-quality internals pre-selected...09031057- SKU:
- 09031057
- Availability:
- Ships Same Business Day
- Weight:
- 8.40 LBS
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$526.95 -
Wiseco Suzuki JR 50 1978-2006 Piston Kit with Gaskets 41mm PK1665
WISECO
$171.95The Wiseco PK1665 is a complete top-end rebuild solution engineered for the Suzuki JR 50's demanding 2-stroke environment. Whether you're dealing with worn compression or preparing for sustained high-RPM use, this kit delivers the precision bore sizing...09030926- SKU:
- 09030926
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 40.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 37.80 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 49 CC
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 41.00 MM
- PRODUCT NAME:
- REBUILD KIT
$171.95 -
Wiseco Piston Kit with Gaskets for KTM 105 SX 2010-2011 PK1644
WISECO
$236.95When your 2-stroke top-end is worn, you're losing power, throttle response, and reliability. The Wiseco PK1644 restores your KTM 105 SX to factory performance specs with aerospace-grade components engineered for competitive racing and trail riding alike...09030925- SKU:
- 09030925
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 52.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 104 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.95 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 51.95 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
$236.95 -
Wiseco KX125 1999-2000 Piston Kit with Gaskets PK1608
WISECO
$230.95If you're running a KX125 two-stroke and want to restore lost compression or build toward more aggressive power outputs, a quality piston kit is non-negotiable. The Wiseco PK1608 gives you everything needed for a complete top-end rebuild in one...09030923- SKU:
- 09030923
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 53.95 MM
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 54.00 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
$230.95 -
Wiseco Piston Kit for Yamaha YZ250 1999-2001 PK1573
WISECO
$277.95When your YZ250's piston and ring package shows wear, power delivery suffers—and so does your lap times. The Wiseco PK1573 rebuilds your top end with aerospace-grade 4032 aluminum that handles sustained high-RPM abuse while maintaining the tight...09030921- SKU:
- 09030921
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON DIAMETER METRIC:
- 66.36 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- DISPLACEMENT:
- 249 CC
- PRODUCT NAME:
- REBUILD KIT
- STROKE LENGTH METRIC:
- 72.00 MM
$277.95 -
Wiseco 125 SX 2002-2006 Piston Kit with Gaskets PK1512
WISECO
$225.95When you're rebuilding a 125 SX top end or looking to restore your engine to factory specifications, you need a piston kit that combines precision engineering with comprehensive components. Wiseco's PK1512 delivers the reliability you expect from a...09030699- SKU:
- 09030699
- Availability:
- Ships Same Business Day
- Weight:
- 1.48 LBS
- BORE SIZE METRIC:
- 54.00 MM
- PRODUCT NAME:
- REBUILD KIT
- PISTON DIAMETER METRIC:
- 53.95 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$225.95 -
Wiseco Piston Kit 56mm for Yamaha YZ125X 2020-2022 PK1391
WISECO
$239.95When your YZ125X's top-end reaches the end of its service life, a quality piston kit is the difference between a reliable rebuild and premature failure. The Wiseco PK1391 delivers OEM-equivalent precision with high-silicon forged aluminum construction...09030681- SKU:
- 09030681
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- COOLING SYSTEM:
- AIR COOLED
- STROKE LENGTH METRIC:
- 54.50 MM
- DISPLACEMENT:
- 134 CC
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$239.95 -
Pro Filter Oil Filter for 2003-2004 Polaris Sportsman 600 PF-196
PRO FILTER
$12.99Clean oil is non-negotiable for engine longevity, and the PRO FILTER PF-196 delivers the filtration performance your 2003-2004 Polaris Sportsman 600 demands. With advanced micro-pore technology that exceeds OEM specs, this filter maintains optimal flow...07120607- SKU:
- 07120607
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COLOR/FINISH:
- BLACK
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ATV
- BASE COLOR:
- BLACK
- RIDING STYLE:
- SNOW
- STYLE:
- PREMIUM
$12.99 -
Pro Filter Replacement Oil Filter for 1996-2004 Aprilia Leonardo 125 PF-185
PRO FILTER
$6.99Your Aprilia Leonardo's engine relies on clean oil to maintain peak performance and longevity. The Pro Filter Replacement Oil Filter PF-185 delivers OEM-equivalent filtration with advanced micro-pore technology that removes contaminants while maintaining...07120604- SKU:
- 07120604
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
- BASE FINISH:
- CHROME
- STYLE:
- PREMIUM
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
$6.99 -
Pro Filter Oil Filter for 2003-2006 Aprilia Atlantic 125 PF-183
PRO FILTER
$11.99Keeping your Atlantic 125's engine clean isn't optional—it's the foundation of reliable performance and longevity. The PRO FILTER PF-183 delivers superior filtration beyond OEM standards, protecting your engine from contaminants while maintaining the...07120603- SKU:
- 07120603
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PRODUCT NAME:
- OIL FILTER
- BASE FINISH:
- CHROME
- STYLE:
- PREMIUM
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$11.99 -
Pro Filter Harley Davidson FXD Dyna Super Glide 1995-1998 FXDL Dyna Low Rider 1993-1998 FXDWG Dyna Wide Glide 1993-1998 FXDB-D Dyna Glide Daytona 1992 FXDB-S Dyna Glide Sturgis 1991 PF-173C
PRO FILTER
$17.99Keep your Dyna's engine running clean with the PRO FILTER PF-173C, a direct replacement that meets or exceeds OEM specifications for reliable protection across thousands of miles. Built with advanced micro-pore filtration technology, this filter removes...07120600- SKU:
- 07120600
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BASE FINISH:
- CHROME
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- STYLE:
- PREMIUM
$17.99
