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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On Sale
Wossner Honda CRF450R 2005-2008 CRF450X 2005-2017 95.97mm Piston Kit 8608DB
WOSSNER
MSRP: $214.00Now: $203.30Was: $214.00The Wossner 8608DB piston kit delivers the reliability and performance your Honda CRF engine demands. Whether you're running a CRF450R or CRF450X, this German-engineered piston maintains consistent...09104945- SKU:
- 09104945
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE:
- +0,01 MM
- PISTON SIZE METRIC:
- 95.97 MM
- PRODUCT NAME:
- PISTON KIT
- MODEL:
- PREMIUM SERIES
- BORE SIZE METRIC:
- 96.01 MM
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +0.01 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $214.00Now: $203.30Was: $214.00Qty in Cart: 0Quantity:Price:MSRP: $214.00Now: $203.30Was: $214.00Subtotal: -
On Sale
Wossner Piston Kit 94.96mm 12.3:1 Compression Yamaha YZ450F 2006-2009 8630DA
WOSSNER
MSRP: $204.00Now: $193.80Was: $204.00The stock piston in your YZ450F experiences extreme thermal and mechanical stress during high-RPM operation, leading to power loss and accelerated wear. The Wossner 8630DA replaces this weak link...09104950- SKU:
- 09104950
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 95.00 MM
- PISTON SIZE METRIC:
- 94.96 MM
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 12.3:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $204.00Now: $193.80Was: $204.00 -
On Sale
Wossner Piston Kit 77.98mm Honda CRF250X 2004-2017 8656DC
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00Stock pistons wear quickly under the demands of racing and high-performance riding. The Wossner 8656DC delivers the precision engineering and durability you need to maintain peak power output and...09104962- SKU:
- 09104962
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PISTON SIZE METRIC:
- 77.98 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 78.02 MM
MSRP: $184.00Now: $174.80Was: $184.00Qty in Cart: 0Quantity:Price:MSRP: $184.00Now: $174.80Was: $184.00Subtotal: -
MOOSE RACING Oil Filter DT-09-21
MOOSE RACING
$5.95A clean oil system is fundamental to engine longevity and performance. The MOOSE RACING Oil Filter DT-09-21 delivers reliable filtration that protects critical engine components from wear-inducing...07120221- SKU:
- 07120221
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- MICRON RATING:
- 10 MICRONS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
MOOSE RACING Magnetic Drain Plug DP110
MOOSE RACING
$23.95Metal particles inevitably circulate through your engine oil—and over time, they accelerate wear on bearings, cylinder walls, and critical internals. The MOOSE RACING Magnetic Drain Plug DP110...09200048- SKU:
- 09200048
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- 7075 ALUMINUM
- UNITS:
- EACH
- DIAMETER - THREAD SIZE METRIC:
- M10 X 1.50 X 17 MM
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
- PRODUCT NAME:
- PLUG
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$23.95Qty in Cart: 0Quantity:Price:$23.95Subtotal: -
On Sale
VESRAH Top End Gasket Kit - Kawasaki 100 VG-843
VESRAH
MSRP: $15.11Now: $14.35Was: $15.11A top-end rebuild demands precision gaskets that seal reliably under high RPM and combustion pressures—VESRAH's OEM-quality gasket kit eliminates guesswork and potential leaks. This complete set...VG843- SKU:
- VG843
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $15.11Now: $14.35Was: $15.11Qty in Cart: 0Quantity:Price:MSRP: $15.11Now: $14.35Was: $15.11Subtotal: -
HOT RODS Crankshaft Assembly 4035
HOT RODS
$417.95A high-performance crankshaft assembly is the heart of any rebuilt or modified engine—and the HOT RODS 4035 delivers the durability and precision you need to push power limits without sacrificing...H124- SKU:
- H124
- Availability:
- Ships Same Business Day
- Weight:
- 6.30 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 125 CC
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.60 MM
$417.95Qty in Cart: 0Quantity:Price:$417.95Subtotal: -
HOT RODS Connecting Rod 8142
HOT RODS
$135.95Whether you're rebuilding a high-rpm engine or replacing worn OE connecting rods, the HOT RODS 8142 delivers the durability and precision needed for sustained performance under extreme load. The...CR160- SKU:
- CR160
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-CYCLE
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 8620 STEEL
$135.95Qty in Cart: 0Quantity:Price:$135.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - XR650 C3216
COMETIC
MSRP: $40.95Now: $36.86Was: $40.95A quality gasket set is non-negotiable for top-end reliability, especially on high-output engines where combustion pressures demand precise sealing. The COMETIC C3216 is engineered specifically for...C7151- SKU:
- C7151
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET KIT
- BORE SIZE METRIC:
- 102.50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
- UNITS:
- KIT
MSRP: $40.95Now: $36.86Was: $40.95Qty in Cart: 0Quantity:Price:MSRP: $40.95Now: $36.86Was: $40.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Suzuki C7136
COMETIC
MSRP: $40.95Now: $36.86Was: $40.95A failing head gasket compromises combustion sealing and bleeds horsepower—especially under boost or high cylinder pressures. The COMETIC C7136 Top End Gasket Set delivers multi-layered steel...C7136- SKU:
- C7136
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $40.95Now: $36.86Was: $40.95 -
On Sale
COMETIC Top End Gasket Set - Suzuki C7054
COMETIC
MSRP: $28.95Now: $26.06Was: $28.95A quality top end gasket set is non-negotiable for any engine rebuild or head service—failed seals mean oil leaks, compression loss, and potential catastrophic damage. The COMETIC C7054 delivers the...C7054- SKU:
- C7054
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET KIT
- TYPE:
- TOP END
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $28.95Now: $26.06Was: $28.95Qty in Cart: 0Quantity:Price:MSRP: $28.95Now: $26.06Was: $28.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Kawasaki C6043
COMETIC
MSRP: $51.95Now: $46.76Was: $51.95A complete top-end gasket failure can sideline your engine and derail your race schedule. COMETIC's C6043 gasket set delivers the reliability you need for consistent performance, whether you're...C6043- SKU:
- C6043
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
- DISPLACEMENT:
- 750 CC
- PRODUCT NAME:
- GASKET KIT
MSRP: $51.95Now: $46.76Was: $51.95Qty in Cart: 0Quantity:Price:MSRP: $51.95Now: $46.76Was: $51.95Subtotal: -
Wiseco Piston Kit +2.00 mm Kawasaki KX 85 2001-2009 782M05050
WISECO
$134.95If you're running a KX 85 in competitive environments, piston wear directly impacts your power band consistency and engine reliability. The Wiseco +2.00 mm kit delivers measurable gains in...782M05050- SKU:
- 782M05050
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.80 MM
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 50.50 MM
- DISPLACEMENT:
- 84,9 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 45,80 MM
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal: -
Wiseco Piston Standard 66.40mm 2000 Husqvarna WR 250 761M06640
WISECO
$184.95When you're pushing your WR 250 to the limit, your piston needs to match your commitment to performance. The Wiseco 66.40mm forged piston delivers the strength and precision required for competitive...761M06640- SKU:
- 761M06640
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.40 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$184.95Qty in Cart: 0Quantity:Price:$184.95Subtotal: -
Wiseco Piston Standard Suzuki RM 125 2000-2003 754M05400
WISECO
$144.95The Wiseco Piston Standard for Suzuki RM 125 delivers the durability and power output demanded by competitive racers and serious tuners. Built from high-silicon aluminum alloy with a forged design,...754M05400- SKU:
- 754M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- DISPLACEMENT:
- 124,8 CC
- STROKE LENGTH:
- 54,50 MM
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit 68.50 mm Oversize for Yamaha YZ 250 1999-2022 677M06850
WISECO
$199.95If you're rebuilding your Yamaha YZ 250 or WR 250 and want to maximize displacement without a complete engine overhaul, a +.50 mm oversize piston is the smart choice. Wiseco's forged aluminum...677M06850- SKU:
- 677M06850
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +0,50 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH METRIC:
- 68.00 MM
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 68,00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 68.50 MM
- DISPLACEMENT:
- 246,8 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston 1.00mm Oversize for 2004 Honda CR125R 676M05500
WISECO
$143.95If you're running a 2004 Honda CR125R at the edge of its limits, a worn or damaged piston directly costs you compression, power, and reliability. The Wiseco Piston 676M05500 restores your engine's...676M05500- SKU:
- 676M05500
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
$143.95Qty in Cart: 0Quantity:Price:$143.95Subtotal: -
Wiseco Piston Kit 54mm for Kawasaki KX125 1994 640M05400
WISECO
$162.95If you're running a KX125 and want measurable gains in compression ratio and power delivery, a quality piston kit is non-negotiable. The Wiseco +.50mm piston gives you that precision-forged...652M05450- SKU:
- 652M05450
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.50 MM
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 54,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$162.95 -
Wiseco Piston Kit 48.50mm Bore Yamaha PW80 2006 649M04850
WISECO
$144.95If you're running a 2-stroke PW80 or BW80, piston wear directly impacts throttle response and engine efficiency. The Wiseco 649M04850 delivers measurable gains in acceleration and combustion...649M04850- SKU:
- 649M04850
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- +1,50 MM
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE - OVERSIZE METRIC:
- +1.50 MM
- DISPLACEMENT:
- 72 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 42.00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 48.50 MM
- STROKE LENGTH:
- 42,00 MM
$144.95Qty in Cart: 0Quantity:Price:$144.95Subtotal: -
Wiseco Piston Kit Yamaha YZ80 1985-1987 0.50mm 646M04750
WISECO
$134.95The piston is the heart of your YZ80's 2-stroke engine—when it's worn or damaged, power delivery suffers and reliability tanks. Wiseco's forged aluminum construction handles the brutal heat and...646M04750- SKU:
- 646M04750
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH:
- 47,80 MM
- STROKE LENGTH METRIC:
- 47.80 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 82 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
$134.95Qty in Cart: 0Quantity:Price:$134.95Subtotal:
