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
Wiseco Piston Kit 78mm 13.9:1 Compression for KTM 250 SX-F 2013-2015 40074M07800
WISECO
MSRP: $244.95Now: $208.00Was: $244.95The WISECO Piston Kit 40074M07800 is designed for high-performance applications, ensuring optimal engine efficiency and power. Engineered with precision, this piston kit enhances durability and provides a perfect fit for your engine rebuild or upgrade...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
MSRP: $244.95Now: $208.00Was: $244.95Qty in Cart: 0Quantity:Price:MSRP: $244.95Now: $208.00Was: $244.95Subtotal: -
On Sale
Wiseco Piston Kit 49.50mm Oversize for Suzuki RM80 1977-1981 456M04950
WISECO
MSRP: $134.95Now: $115.00Was: $134.95Engineered for optimal performance, the Wiseco .50mm piston is forged from a high-silicon alloy, ensuring exceptional strength and reliability in both trail and racing scenarios. This piston is designed to enhance engine efficiency and durability, making...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
MSRP: $134.95Now: $115.00Was: $134.95 -
On Sale
Wiseco Honda CR125R 2004-2007 Racer Elite Piston Kit RE922M05400
WISECO
MSRP: $204.95Now: $174.00Was: $204.95Elevate your engine's performance with the WISECO Racer Elite Piston Kit, engineered for unparalleled strength and efficiency. Crafted from advanced 2000 Series alloy, this piston is designed to withstand extreme conditions while ensuring optimal ring...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
MSRP: $204.95Now: $174.00Was: $204.95Qty in Cart: 0Quantity:Price:MSRP: $204.95Now: $174.00Was: $204.95Subtotal: -
On Sale
Wiseco Honda XR600R 1985-2000 Piston Kit 4577M09700
WISECO
MSRP: $239.95Now: $204.00Was: $239.95Engineered for exceptional performance, the Wiseco Piston 4577M09700 is crafted from a high-silicon alloy, ensuring unparalleled strength and reliability. Designed for both trail and racing applications, this piston is a perfect choice for enthusiasts...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
MSRP: $239.95Now: $204.00Was: $239.95Qty in Cart: 0Quantity:Price:MSRP: $239.95Now: $204.00Was: $239.95Subtotal: -
Wossner Connecting Rod Yamaha YZ80 1993-2001 P2008
WOSSNER
$112.00Upgrade your performance with the WOSSNER Connecting Rod Kit, meticulously crafted to ensure a perfect fit and enhanced durability for your YZ80. This premium kit is designed for a seamless crankshaft rebuild, offering superior strength and reliability...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
$112.00Qty in Cart: 0Quantity:Price:$112.00Subtotal: -
Wossner Piston Kit 55.00mm Honda CR125R 1992-1999 8020D100
WOSSNER
$142.00Experience unparalleled performance with the WOSSNER Piston Kit 8020D100, expertly crafted for 2-stroke engines. Engineered with precision and using advanced materials, this piston kit ensures optimal efficiency, reduced friction, and enhanced durability...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
$142.00Qty in Cart: 0Quantity:Price:$142.00Subtotal: -
Wossner Honda CRF450R 2005-2008 CRF450X 2005-2017 95.97mm Piston Kit 8608DB
WOSSNER
$214.00Elevate your engine's performance with the WOSSNER Piston Kit 8608DB, specifically designed for 2-stroke engines. Crafted from premium materials and engineered with precision, this piston kit ensures optimal efficiency and longevity, making it an ideal...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
$214.00 -
Wossner Piston Kit 94.96mm 12.3:1 Compression Yamaha YZ450F 2006-2009 8630DA
WOSSNER
$204.00Elevate your engine's performance with the WOSSNER Piston Kit 8630DA, expertly engineered for 2-stroke applications. Crafted from high-quality 4032 T6 forged aluminum alloy, this piston kit is designed to deliver exceptional durability and reduced...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
$204.00Qty in Cart: 0Quantity:Price:$204.00Subtotal: -
Wossner Piston Kit 77.98mm Honda CRF250X 2004-2017 8656DC
WOSSNER
$184.00Experience unparalleled performance with the WOSSNER Piston Kit 8656DC, designed specifically for 2-stroke engines. This kit combines advanced engineering and high-quality materials to enhance your engine's efficiency and power output, ensuring a...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
$184.00Qty in Cart: 0Quantity:Price:$184.00Subtotal: -
MOOSE RACING Oil Filter DT-09-21
MOOSE RACING
$5.95High-quality replacement for your standard filter, Can filter down to 10 microns, Constructed with high-quality paper filter materials, Manufactured with sealing ring to ensure perfect fit, Offers maximum protection and long-lasting filter life, May be...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
$23.95Made from 7075 lightweight aluminum, Prolong engine life by pulling metal filings out of the oil, Ultra-powerful magnets, Come with either O-ring or washer sealing surface, Compare with original OEM plug before installing, Made in the U.S.A.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: -
VESRAH Top End Gasket Kit - Kawasaki 100 VG-843
VESRAH
$15.11Complete gasket sets include all necessary engine gaskets, o-rings and valve guide oil seals to rebuild a complete engine (do not include oil seals); sold each, Top-end gasket sets include all necessary top-end gaskets, o-rings and valve guide oil seals...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
$15.11Qty in Cart: 0Quantity:Price:$15.11Subtotal: -
On Sale
HOT RODS Crankshaft Assembly 4035
HOT RODS
MSRP: $417.95Now: $376.16Was: $417.95Sold complete with the original proven Hot Rods connecting rods, top-end bearings and crankshaft webs, Factory assembled and trued to OEM specifications; meet or surpass OEM in performance and durability, Complete and ready for installation, Completely...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
MSRP: $417.95Now: $376.16Was: $417.95Qty in Cart: 0Quantity:Price:MSRP: $417.95Now: $376.16Was: $417.95Subtotal: -
On Sale
HOT RODS Connecting Rod 8142
HOT RODS
MSRP: $135.95Now: $122.36Was: $135.95Heavy-duty OE replacement connecting rods, Certified 8620 AISI steel provides superior strength, Crankpins are manufactured from hot-rolled ASTM 4115 and case hardened to 58-62Rc, Feature the latest in caged needle roller bearing designs for high rpm...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
MSRP: $135.95Now: $122.36Was: $135.95Qty in Cart: 0Quantity:Price:MSRP: $135.95Now: $122.36Was: $135.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - XR650 C3216
COMETIC
MSRP: $40.95Now: $38.00Was: $40.95Top end gasket kits include correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket sealing surface, providing less bore...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: $38.00Was: $40.95Qty in Cart: 0Quantity:Price:MSRP: $40.95Now: $38.00Was: $40.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Suzuki C7136
COMETIC
MSRP: $40.95Now: $38.00Was: $40.95Top end gasket kits include correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket sealing surface, providing less bore...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: $38.00Was: $40.95 -
On Sale
COMETIC Top End Gasket Set - Suzuki C7054
COMETIC
MSRP: $28.95Now: $27.00Was: $28.95Top end gasket kits include correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket sealing surface, providing less bore...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: $27.00Was: $28.95Qty in Cart: 0Quantity:Price:MSRP: $28.95Now: $27.00Was: $28.95Subtotal: -
On Sale
COMETIC Top End Gasket Set - Kawasaki C6043
COMETIC
MSRP: $51.95Now: $49.00Was: $51.95Gasket kits are complete with head, base, reed, intake, manifold and exhaust gaskets, Graphite head gaskets are manufactured from non-asbestos, flexible graphite laminated to a stainless steel core, Graphite material is impervious to fuels, coolants and...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: $49.00Was: $51.95Qty in Cart: 0Quantity:Price:MSRP: $51.95Now: $49.00Was: $51.95Subtotal: -
On Sale
Wiseco Piston Kit +2.00 mm Kawasaki KX 85 2001-2009 782M05050
WISECO
MSRP: $134.95Now: $115.00Was: $134.95Elevate your racing experience with the Wiseco Piston, expertly crafted for the Kawasaki KX 85. Designed for both durability and performance, this piston delivers enhanced horsepower and torque, making it ideal for competitive and trail riding. ...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
MSRP: $134.95Now: $115.00Was: $134.95Qty in Cart: 0Quantity:Price:MSRP: $134.95Now: $115.00Was: $134.95Subtotal: -
On Sale
Wiseco Piston Standard 66.40mm 2000 Husqvarna WR 250 761M06640
WISECO
MSRP: $184.95Now: $157.00Was: $184.95Experience unparalleled power and durability with the WISECO piston, expertly crafted from high-silicon aluminum alloy. Designed for both competitive racing and trail riding, this piston enhances performance while ensuring longevity and reliability. ...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
MSRP: $184.95Now: $157.00Was: $184.95
