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 Ring Set 54.50mm Yamaha TTR125 2000-2004 2146XE
WISECO
$46.95The Wiseco Ring Set 2146XE delivers the precision sealing and durability your TTR125 engine demands, whether you're rebuilding after high-mileage wear or upgrading to a Wiseco performance piston...09120126- SKU:
- 09120126
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 54.50 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 99,2 CC
$46.95Qty in Cart: 0Quantity:Price:$46.95Subtotal: -
Wiseco 55mm Piston Ring Set for Yamaha TTR125 2000-2004 2165XE
WISECO
$44.95Worn piston rings are a silent performance killer, allowing combustion gases to leak past the ring seal and reducing compression, power output, and fuel efficiency. The Wiseco 2165XE ring set...09120127- SKU:
- 09120127
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 55.00 MM
- DISPLACEMENT:
- 99,2 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$44.95Qty in Cart: 0Quantity:Price:$44.95Subtotal: -
WISECO Ring Set 8900ZC
WISECO
$49.95Wiseco ring sets are engineered to maximize compression, reduce blowby, and extend engine life under high-stress conditions. Whether you're building a performance engine or rebuilding a tired block,...09120131- SKU:
- 09120131
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- BORE SIZE METRIC:
- 89.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- DISPLACEMENT:
- 398 CC
- RIDING STYLE:
- ATV
$49.95Qty in Cart: 0Quantity:Price:$49.95Subtotal: -
Wiseco 97.00mm Ring Set for 2007-2012 KTM 450 SX-F 9700ZS
WISECO
$52.95A worn or damaged ring set compromises combustion chamber sealing, leading to blow-by, power loss, and accelerated engine wear—especially critical in high-stress racing applications. The Wiseco...09120133- SKU:
- 09120133
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- DISPLACEMENT:
- 449 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- UNITS:
- SET
- BORE SIZE METRIC:
- 97 MM
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
Wiseco 95mm Piston Ring Set for KTM 450 SX-F 2003-2006 9500ZS
WISECO
$52.95Worn or damaged piston rings directly compromise compression, increase blow-by, and degrade power output—especially critical on a high-strung 450 SX-F that demands peak performance. The Wiseco 9500ZS...09120134- SKU:
- 09120134
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- BORE SIZE METRIC:
- 95.00 MM
- DISPLACEMENT:
- 449 CC
- UNITS:
- SET
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
Wiseco Ring Set 77mm for Kawasaki KX250F 2004-2018 Suzuki RM-Z250 2004-2024 Yamaha YZ250F 2001-2011 7700YC
WISECO
$62.95Piston ring sets are critical to engine sealing and performance—they control compression, manage oil consumption, and directly impact power delivery. The Wiseco 7700YC is engineered to OEM tolerances...09120140- SKU:
- 09120140
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$62.95 -
Wiseco Wrist Pin Honda CR125R 1985-1986 Suzuki RM125 1981-1986 S485
WISECO
$23.95The Wiseco S485 wrist pin is engineered to handle the extreme combustion pressures and RPM demands of high-revving two-stroke engines. If you're rebuilding a Honda CR125R or Suzuki RM125 for...09130006- SKU:
- 09130006
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- LENGTH:
- 54 MM
- OUTSIDE DIAMETER:
- 14,00 MM
- OUTSIDE DIAMETER METRIC:
- 14.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- MATERIAL:
- ALUMINUM
- LENGTH METRIC:
- 54.00 MM
- PRODUCT NAME:
- WRIST PIN
$23.95 -
Wiseco Wrist Pin Honda CRF250R 2004-2019 S686
WISECO
$19.95A wrist pin is the critical link between your piston and connecting rod—when it fails, your engine stops. The Wiseco S686 delivers the precision tolerances and material integrity that Honda CRF250R...09130008- SKU:
- 09130008
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- LENGTH:
- 52,2 MM
- LENGTH METRIC:
- 52.2 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 16,00 MM
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER METRIC:
- 16.00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
$19.95 -
Wiseco Crankshaft with Bearing and Gasket for 2004-2009 Honda CRF250R WPC159
WISECO
$532.95A worn or damaged crankshaft compromises engine reliability and performance—especially in high-RPM racing applications where precision is non-negotiable. The Wiseco WPC159 crankshaft assembly...09210140- SKU:
- 09210140
- Availability:
- Ships Same Business Day
- Weight:
- 10.06 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 52.20 MM
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$532.95 -
Wiseco Crankshaft Assembly for 2004-2007 Kawasaki KX250F WPC144
WISECO
$621.95A quality crankshaft assembly is the foundation of engine reliability and performance—without it, you're risking catastrophic failure and lost race time. The Wiseco WPC144 delivers factory-assembled...09210141- SKU:
- 09210141
- Availability:
- Ships Same Business Day
- Weight:
- 10.10 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$621.95Qty in Cart: 0Quantity:Price:$621.95Subtotal: -
Wiseco Crankshaft Assembly with Bearings and Gasket for 1995-2005 Kawasaki KX100 WPC119
WISECO
$344.95A crankshaft is the foundation of your engine's reliability and performance—a worn or damaged unit will rob you of power and risk catastrophic failure. The Wiseco WPC119 is factory-assembled and...09210089- SKU:
- 09210089
- Availability:
- Ships Same Business Day
- Weight:
- 6.31 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- STROKE LENGTH METRIC:
- 45.80 MM
$344.95Qty in Cart: 0Quantity:Price:$344.95Subtotal: -
Wiseco Crankshaft Kit for Honda CR250R 1992-2001 WPC101
WISECO
$466.95The Wiseco WPC101 crankshaft kit is engineered for CR250R racers who demand reliability under extreme combustion loads and sustained high RPM operation. This factory-assembled unit arrives...09210090- SKU:
- 09210090
- Availability:
- Ships Same Business Day
- Weight:
- 12.72 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- STROKE LENGTH METRIC:
- 72.00 MM
$466.95 -
Wiseco Crankshaft Kit for Kawasaki KX65 2000-2005 and Suzuki RM65 2003-2005 WPC117
WISECO
$332.95A worn or damaged crankshaft limits your engine's ability to deliver consistent power and reliability. The Wiseco Crankshaft Kit gives you a factory-assembled, precision-engineered solution that...09210093- SKU:
- 09210093
- Availability:
- Ships Same Business Day
- Weight:
- 5.28 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 41.60 MM
- UNITS:
- KIT
$332.95 -
Wiseco Crankshaft Assembly with Bearings and Gasket for 2003-2004 Honda CR85R WPC115
WISECO
$314.95If you're rebuilding a 2003-2004 Honda CR85R, the crankshaft is the foundation of your engine's reliability and performance. The Wiseco Crankshaft Assembly eliminates the guesswork by delivering a...09210094- SKU:
- 09210094
- Availability:
- Ships Same Business Day
- Weight:
- 6.70 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BOTTOM END
- STROKE LENGTH METRIC:
- 47.80 MM
$314.95Qty in Cart: 0Quantity:Price:$314.95Subtotal: -
Wiseco Crankshaft Kit for 2001-2003 Suzuki RM125 WPC121
WISECO
$432.95If you're rebuilding a 2001-2003 RM125 or pushing your existing bottom-end to its limits, a quality crankshaft kit isn't optional—it's essential. The Wiseco WPC121 eliminates the guesswork of...09210095- SKU:
- 09210095
- Availability:
- Ships Same Business Day
- Weight:
- 9.23 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- UNITS:
- KIT
$432.95Qty in Cart: 0Quantity:Price:$432.95Subtotal: -
Wiseco Crankshaft Assembly for 2001-2004 Yamaha YZ125 WPC125
WISECO
$410.95A worn or damaged crankshaft directly compromises engine reliability and power delivery on your YZ125. This Wiseco assembly eliminates guesswork with factory-assembled, precision-trued components...09210096- SKU:
- 09210096
- Availability:
- Ships Same Business Day
- Weight:
- 8.02 LBS
- STROKE LENGTH METRIC:
- 54.50 MM
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$410.95Qty in Cart: 0Quantity:Price:$410.95Subtotal: -
Wiseco Crankshaft Assembly with Bearing and Gasket for Yamaha YZ250 2003-2025 WPC134
WISECO
$466.95A worn or damaged crankshaft assembly compromises engine reliability, throttle response, and overall power delivery—especially critical in high-RPM racing applications. The Wiseco WPC134 is a...09210097- SKU:
- 09210097
- Availability:
- Ships Same Business Day
- Weight:
- 12.16 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$466.95 -
Wiseco Crankshaft Assembly with Bearings and Gasket for 2003-2012 Yamaha YZ250F WPC140
WISECO
$577.95If you're rebuilding a YZ250F bottom end, you need a crankshaft assembly that can handle the demands of consistent high-RPM operation without compromise. The Wiseco WPC140 delivers factory-grade...09210098- SKU:
- 09210098
- Availability:
- Ships Same Business Day
- Weight:
- 8.65 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
$577.95Qty in Cart: 0Quantity:Price:$577.95Subtotal: -
Wiseco Yamaha YZ80 1993-2001 Crankshaft Kit WPC122
WISECO
$343.95A worn or failing crankshaft will tank your YZ80's reliability and power delivery—this Wiseco kit gives you a factory-assembled, precision-engineered replacement that meets OEM specifications and...09210101- SKU:
- 09210101
- Availability:
- Ships Same Business Day
- Weight:
- 6.24 LBS
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$343.95 -
Wiseco Crankshaft Assembly with Bearings and Gasket for 2001-2002 Yamaha YZ250 WPC127
WISECO
$477.95A worn or damaged crankshaft will cripple your YZ250's power delivery and reliability on the track. The Wiseco WPC127 assembly delivers factory-spec precision with OEM-matched tolerances, so you get...09210102- SKU:
- 09210102
- Availability:
- Ships Same Business Day
- Weight:
- 12.30 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- INCLUDES BEARING AND GASKET
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- TYPE:
- BOTTOM END
- UNITS:
- KIT
$477.95
