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 78mm 13.9:1 Compression for KTM 250 SX-F 2013-2015 40074M07800
WISECO
$244.95If you're rebuilding your KTM 250 SX-F or pushing it to the limit on the track, a quality piston kit is non-negotiable—it's the foundation of reliable power delivery and engine longevity. The Wiseco...09103166- SKU:
- 09103166
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- STROKE LENGTH METRIC:
- 52.30 MM
- COMPRESSION RATIO IMPERIAL:
- 13.9:1
- DISPLACEMENT:
- 250 CC
- RIDING STYLE:
- STREET
- BORE SIZE METRIC:
- 78.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
Wiseco Piston Kit 49.50mm Oversize for Suzuki RM80 1977-1981 456M04950
WISECO
$135.95If you're rebuilding or refreshing your RM80's top end, piston choice directly impacts combustion efficiency, ring sealing, and overall engine longevity. Wiseco's high-silicon alloy construction...456M04950- SKU:
- 456M04950
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON DIAMETER METRIC:
- 49.45 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 42.00 MM
- BORE SIZE METRIC:
- 49.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 79 CC
$135.95 -
Wiseco Honda CR125R 2004-2007 Racer Elite Piston Kit RE922M05400
WISECO
$204.95If you're running a 2004-2007 Honda CR125R and demand reliability under peak RPM conditions, the Wiseco Racer Elite Piston Kit delivers the durability and ring seal precision required for consistent...09105080- SKU:
- 09105080
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE SIZE METRIC:
- 54.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Honda XR600R 1985-2000 Piston Kit 4577M09700
WISECO
$239.95A worn or damaged piston directly compromises your XR600R's power delivery, fuel efficiency, and engine reliability—especially if you're pushing the bike hard on trail or track. Wiseco's 4577M09700...4577M09700- SKU:
- 4577M09700
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STROKE LENGTH METRIC:
- 80.00 MM
- DISPLACEMENT:
- 591 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 97 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 96.92 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$239.95Qty in Cart: 0Quantity:Price:$239.95Subtotal: -
On Sale
Wossner Connecting Rod Yamaha YZ80 1993-2001 P2008
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00If you're rebuilding your YZ80's bottom end, a quality connecting rod is non-negotiable—it's the critical link between your piston and crankshaft that determines how reliably your engine handles peak...09230400- SKU:
- 09230400
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- STYLE:
- STANDARD
MSRP: $112.00Now: $106.40Was: $112.00Qty in Cart: 0Quantity:Price:MSRP: $112.00Now: $106.40Was: $112.00Subtotal: -
On Sale
Wossner Piston Kit 55.00mm Honda CR125R 1992-1999 8020D100
WOSSNER
MSRP: $142.00Now: $134.90Was: $142.00If you're running a Honda CR125R and need reliable top-end performance, a quality piston kit isn't optional—it's essential. The Wössner 8020D100 delivers the durability and efficiency demanded by...09104721- SKU:
- 09104721
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON SIZE METRIC:
- 54.95 MM
- TYPE:
- SINGLE RING
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 55.00 MM
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
MSRP: $142.00Now: $134.90Was: $142.00Qty in Cart: 0Quantity:Price:MSRP: $142.00Now: $134.90Was: $142.00Subtotal: -
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: $204.00Qty in Cart: 0Quantity:Price:MSRP: $204.00Now: $193.80Was: $204.00Subtotal: -
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
$11.95A 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
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
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 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: -
COMETIC Top End Gasket Set - XR650 C3216
COMETIC
$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
$40.95Qty in Cart: 0Quantity:Price:$40.95Subtotal: -
COMETIC Top End Gasket Set - Suzuki C7136
COMETIC
$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
$40.95 -
COMETIC Top End Gasket Set - Suzuki C7054
COMETIC
$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
$28.95Qty in Cart: 0Quantity:Price:$28.95Subtotal: -
COMETIC Top End Gasket Set - Kawasaki C6043
COMETIC
$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
$51.95Qty in Cart: 0Quantity:Price:$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:
