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
-
Wiseco Piston Kit with Gasket for Yamaha YZ125 2005-2020 PK1572
WISECO
$224.95The Wiseco PK1572 is engineered for 2-stroke riders who refuse to compromise on reliability or performance. Whether you're chasing lap times or putting in trail miles, a worn piston and ring pack will rob you of power and throttle response—this complete...09031160- SKU:
- 09031160
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 134 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit with Gasket for Kawasaki KX100 2014-2021 PK1910
WISECO
$189.95A worn or damaged piston directly compromises your KX100's combustion efficiency, throttle response, and overall reliability—especially if you're pushing the engine hard in competition or trail riding. The Wiseco PK1910 restores your 2-stroke's...09031154- SKU:
- 09031154
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- MODEL:
- PRO-LITE
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 99 CC
- PISTON DIAMETER METRIC:
- 54.45 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
$189.95Qty in Cart: 0Quantity:Price:$189.95Subtotal: -
Wiseco Piston Kit with Gasket for Kawasaki KX100 2014-2020 PK1908
WISECO
$192.95When your KX100's top-end starts to lose compression and throttle response suffers, a quality piston kit is the difference between limping through the season and reclaiming peak performance. The Wiseco PK1908 gives you a complete rebuild solution with...09031152- SKU:
- 09031152
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MODEL:
- PRO-LITE
- PISTON DIAMETER METRIC:
- 52.45 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 99 CC
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 52.50 MM
- STROKE LENGTH METRIC:
- 45.80 MM
$192.95Qty in Cart: 0Quantity:Price:$192.95Subtotal: -
Wiseco Piston Kit with Gasket for Kawasaki KX85 2014-2020 PK1907
WISECO
$179.95When your KX85's top end starts showing signs of wear, a quality piston kit is non-negotiable for maintaining compression, throttle response, and reliability. The Wiseco PK1907 delivers a complete rebuild solution with precision-engineered components...09031151- SKU:
- 09031151
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE:
- +2,00 MM
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 50.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 50.50 MM
- MODEL:
- PRO-LITE
- PISTON SIZE METRIC:
- +2.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- DISPLACEMENT:
- 84.9 CC
- STROKE LENGTH METRIC:
- 45.80 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
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 47mm Piston Kit for KTM 85 SX 2003-2012 PK1639
WISECO
$174.95When your 2-stroke engine demands a fresh top-end, settling for OEM parts leaves performance on the table. The Wiseco PK1639 delivers a complete piston kit engineered from aerospace-grade 4032 aluminum alloy, purpose-built to handle the extreme heat and...09030924- SKU:
- 09030924
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE SIZE METRIC:
- 47.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 48.95 MM
- UNITS:
- KIT
- PISTON DIAMETER METRIC:
- 46.95 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
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 Piston Kit 43mm for Kawasaki KX60 1985-2003 PK1506
WISECO
$172.95A worn or damaged piston directly kills engine performance, response, and reliability—especially in high-revving 2-stroke competition engines. The Wiseco PK1506 is a complete top-end solution engineered to restore peak power while delivering the...09030920- SKU:
- 09030920
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 60 CC
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- STROKE LENGTH METRIC:
- 41.60 MM
- BORE SIZE METRIC:
- 43.00 MM
- PISTON DIAMETER METRIC:
- 42.94 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$172.95Qty in Cart: 0Quantity:Price:$172.95Subtotal: -
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 YZ125 2005-2020 Piston Kit with Gaskets PK1392
WISECO
$249.95The YZ125 demands a piston kit engineered for reliability under intense 2-stroke conditions. Wiseco's PK1392 delivers high-silicon forged aluminum construction that withstands extreme combustion pressures while maintaining lightweight performance...09030682- SKU:
- 09030682
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 58.00 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- COOLING SYSTEM:
- AIR COOLED
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- +4,00 MM
- MODEL:
- RACER'S CHOICE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- EACH
$249.95Qty in Cart: 0Quantity:Price:$249.95Subtotal: -
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 -
Pro Filter Replacement Oil Filter for 1982-1984 Harley Davidson XLX 1000 PF-172C
PRO FILTER
$15.99A quality oil filter is non-negotiable for engine longevity, especially in a high-output machine like your XLX 1000. The PRO FILTER PF-172C delivers OEM-equivalent protection with advanced micro-pore filtration that captures contaminants before they...07120599- SKU:
- 07120599
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STYLE:
- PREMIUM
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- BASE FINISH:
- CHROME
$15.99Qty in Cart: 0Quantity:Price:$15.99Subtotal: -
Pro Filter Oil Filter for BMW R 18 2021-2022 PF-164
PRO FILTER
$11.99Proper oil filtration is non-negotiable for engine longevity, especially on high-revving machines like the BMW R 18. The PRO FILTER PF-164 delivers OEM-equivalent protection with a micro-pore construction that captures contaminants while maintaining the...07120594- SKU:
- 07120594
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- BLACK
- STYLE:
- PREMIUM
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- STREET
$11.99Qty in Cart: 0Quantity:Price:$11.99Subtotal:
