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
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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...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...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...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
$192.95 -
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...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...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...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...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...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...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...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...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
$172.95 -
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...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...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...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
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
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...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...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...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...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...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...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:
