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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Wrench Rabbit Engine Rebuild Kit for KTM 250 SX 2007-2015 WR101-067
WRENCH RABBIT
$985.95When your KTM 250 SX two-stroke hits the mileage wall, a full engine rebuild is the only way to restore compression, reliability, and the crisp power delivery you depend on. The Wrench Rabbit Engine Rebuild Kit (WR101-067) consolidates every critical...09031063- SKU:
- 09031063
- Availability:
- Ships Same Business Day
- Weight:
- 13.95 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$985.95 -
Wrench Rabbit Engine Rebuild Kit for KTM 200 EXC 2003 WR101-090
WRENCH RABBIT
$985.95When your KTM 200 EXC engine reaches the end of its service life, a quality rebuild kit is the most cost-effective path back to reliable performance. The Wrench Rabbit Engine Rebuild Kit delivers all the critical internal components you need in one...09031065- SKU:
- 09031065
- Availability:
- Ships Same Business Day
- Weight:
- 15.23 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$985.95Qty in Cart: 0Quantity:Price:$985.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit Kawasaki KX250 2002-2003 WR101-114
WRENCH RABBIT
$867.95Two-stroke engines demand precision during rebuild—worn internals compromise power delivery and reliability. The Wrench Rabbit Complete Engine Rebuild Kit for your 2002-2003 Kawasaki KX250 eliminates guesswork by bundling OEM-quality components from...09031088- SKU:
- 09031088
- Availability:
- Ships Same Business Day
- Weight:
- 14.35 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
$867.95 -
Hiflofiltro Oil Filter for Honda CB1000 1994-1995 HF303C
HIFLOFILTRO
$14.18Regular oil filter changes are non-negotiable for engine longevity, and the Hiflofiltro HF303C delivers OEM-equivalent protection without compromise. This purpose-built filter for your 1994-1995 Honda CB1000 uses advanced media to capture contaminants...HF303C- SKU:
- HF303C
- Availability:
- Ships Same Business Day
- Weight:
- 0.52 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- LENGTH METRIC:
- 73 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- STYLE:
- PREMIUM
- BASE FINISH:
- CHROME
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- UTV
- TYPE:
- SPIN-ON
- WIDTH METRIC:
- 65 MM
$14.18 -
Hiflofiltro HF154 Oil Filter for Husqvarna SM 610 2006-2007
HIFLOFILTRO
$6.29The Hiflofiltro HF154 is engineered to deliver consistent engine protection on your Husqvarna SM 610, removing contaminants that compromise performance and longevity. Regular oil filter changes with a quality filter like the HF154 are non-negotiable for...HF154- SKU:
- HF154
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- TYPE:
- CARTRIDGE
- BASE COLOR:
- RED
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- STYLE:
- PREMIUM
- WIDTH METRIC:
- 45 MM
$6.29 -
Hiflofiltro Oil Filter for Yamaha YFM200 1985-1989 HF143
HIFLOFILTRO
$8.29Consistent oil filtration is critical to engine longevity on your Yamaha YFM200—contaminated oil accelerates wear on internal components and reduces bearing life. The Hiflofiltro HF143 delivers OEM-equivalent filtration performance in a bolt-on design,...HF143- SKU:
- HF143
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BASE COLOR:
- YELLOW
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- PREMIUM
- LENGTH METRIC:
- 48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- COLOR/FINISH:
- YELLOW
- RIDING STYLE:
- OFF-ROAD
- WIDTH METRIC:
- 38 MM
$8.29 -
Hiflofiltro Oil Filter for Yamaha WR250F 2003-2008 HF141
HIFLOFILTRO
$5.32Keep your WR250F's engine running at peak efficiency with a filter engineered to OEM specifications. Proper filtration is critical for protecting your bike's internals from wear and contaminants, especially when pushing hard on the track or trail. The...HF141- SKU:
- HF141
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- LENGTH METRIC:
- 46 MM
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- RED
- STYLE:
- PREMIUM
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- WIDTH METRIC:
- 38 MM
$5.32 -
Hiflofiltro Oil Filter for 2003-2006 Kawasaki KFX 400 KSF400A1-A3,A6F HF139
HIFLOFILTRO
$4.47Regular oil changes are critical to quad performance, but a quality filter is equally essential—it's your engine's first line of defense against contaminants that accelerate wear. The Hiflofiltro HF139 delivers OEM-equivalent filtration efficiency with...HF139- SKU:
- HF139
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 44 MM
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- CARTRIDGE
- WIDTH METRIC:
- 44 MM
- STYLE:
- PREMIUM
- BASE COLOR:
- RED
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$4.47 -
Hiflofiltro Oil Filter for Suzuki DR650S 1990-1996 HF137
HIFLOFILTRO
$5.18Keep your DR650S running at peak efficiency with the Hiflofiltro HF137 oil filter—engineered to trap fine contaminants while maintaining optimal oil flow to critical engine components. OEM-equivalent construction and advanced filter media mean fewer oil...HF137- SKU:
- HF137
- Availability:
- Ships Same Business Day
- Weight:
- 0.14 LBS
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- WIDTH METRIC:
- 60 MM
- LENGTH METRIC:
- 37 MM
- PRODUCT NAME:
- OIL FILTER
- BASE COLOR:
- RED
- STYLE:
- PREMIUM
- UNITS:
- EACH
$5.18 -
Hiflofiltro Oil Filter for Honda CBR250R 2011-2013 HF112
HIFLOFILTRO
$3.92The Honda CBR250R demands reliable filtration to protect its engine from contaminants and maintain peak performance through every riding season. The Hiflofiltro HF112 delivers OEM-equivalent protection with high-quality construction that captures harmful...HF112- SKU:
- HF112
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 38 MM
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- RED
- RIDING STYLE:
- ATV
- STYLE:
- PREMIUM
- UNITS:
- EACH
- WIDTH METRIC:
- 50 MM
$3.92 -
HOT RODS Crankshaft Assembly 4138
HOT RODS
$464.95If you're building a high-performance long-stroke engine for your ATV, a properly assembled crankshaft is the foundation of reliability and power delivery. The HOT RODS Crankshaft Assembly 4138 arrives factory-assembled and trued to OEM specifications,...H134- SKU:
- H134
- Availability:
- Ships Same Business Day
- Weight:
- 8.92 LBS
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 49.80 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
$464.95 -
HOT RODS Crankshaft Assembly 4017
HOT RODS
$502.95A properly assembled crankshaft is the foundation of reliable engine performance, and the HOT RODS 4017 delivers exactly that—factory-assembled and trued to OEM specifications for immediate installation. Whether you're rebuilding a worn motor or...H128X- SKU:
- H128X
- Availability:
- Ships Same Business Day
- Weight:
- 9.46 LBS
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 250 CC
- MATERIAL:
- 4140 STEEL
- MODEL:
- 2-CYCLE
- STROKE LENGTH METRIC:
- 72.00 MM
- TYPE:
- OEM STROKE
- FEATURES:
- STANDARD CRANKSHAFT
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
$502.95 -
HOT RODS Crankshaft Assembly 4036
HOT RODS
$423.95If you're building a long-stroke engine for your ATV, a quality crankshaft assembly is the foundation of reliability and performance. The HOT RODS Crankshaft Assembly 4036 arrives completely assembled, trued to OEM specifications, and ready to...H125X- SKU:
- H125X
- Availability:
- Ships Same Business Day
- Weight:
- 6.20 LBS
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.60 MM
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 125 CC
- FEATURES:
- STANDARD CRANKSHAFT
$423.95 -
HOT RODS Crankshaft Assembly 4034
HOT RODS
$278.95If you're serious about maximizing engine displacement and power on your ATV, a long-stroke crankshaft assembly is essential—and the HOT RODS 4034 delivers factory-proven reliability without the machine work typically required for these builds. This...H123- SKU:
- H123
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 85 CC
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
$278.95 -
HOT RODS Crankshaft Assembly 4033
HOT RODS
$318.95If you're building or rebuilding a high-performance ATV engine, a quality crankshaft assembly is non-negotiable—it's the foundation of reliability and horsepower delivery. The HOT RODS Crankshaft Assembly 4033 arrives factory-assembled, trued to OEM...H122- SKU:
- H122
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 80 CC
- MATERIAL:
- 4140 STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
$318.95 -
HOT RODS Crankshaft Assembly 4016
HOT RODS
$292.95If you're serious about maximizing your ATV's engine performance, a quality crankshaft assembly is non-negotiable. The HOT RODS 4016 gives you a complete, factory-assembled unit that meets or exceeds OEM specifications without requiring additional...H119- SKU:
- H119
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 80 CC TO 100 CC
- FEATURES:
- STANDARD CRANKSHAFT
- STROKE LENGTH METRIC:
- 45.80 MM
- TYPE:
- OEM STROKE
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
$292.95 -
HOT RODS Crankshaft Assembly 4012
HOT RODS
$198.95If you're building a long-stroke engine for your ATV, you need a crankshaft assembly that won't compromise reliability or performance. The HOT RODS Crankshaft Assembly 4012 arrives factory-assembled, trued to OEM specifications, and ready to...H115- SKU:
- H115
- Availability:
- Ships Same Business Day
- Weight:
- 4.65 LBS
- MODEL:
- 2-CYCLE
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 80 CC
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
$198.95 -
HOT RODS Crankshaft Assembly 4002
HOT RODS
$429.95If you're building a long-stroke engine for your ATV, you need a crankshaft assembly that's been engineered to handle the increased stress and deliver reliable power. The HOT RODS Crankshaft Assembly 4002 arrives factory-assembled and trued to OEM...H101- SKU:
- H101
- Availability:
- Ships Same Business Day
- Weight:
- 9.19 LBS
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 72.00 MM
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 250 CC
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- STEEL
$429.95 -
Hot Cams Stage 1 Camshaft for Honda CRF450R 2002-2006 1016-1
HOT CAMS
$448.95Stock CRF450R camshaft profiles limit your engine's potential across the RPM band. The Hot Cams Stage 1 delivers measurable gains in low-end torque and throttle response without requiring valve spring upgrades or custom machine work. If you're serious...CRF450S1A- SKU:
- CRF450S1A
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- EXHAUST DURATION IMPERIAL:
- 270°
- INTAKE LIFT METRIC:
- 9.60 MM
- EXHAUST LIFT METRIC:
- 8.80 MM
- INTAKE DURATION IMPERIAL:
- 238°
- RIDING STYLE:
- ATV
- TYPE:
- STAGE 1
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
$448.95 -
HOT RODS Connecting Rod 8159
HOT RODS
$151.95If you're building or rebuilding a high-performance engine, your connecting rods carry the full force of combustion thousands of times per minute. The HOT RODS 8159 is engineered to handle sustained high-rpm loads without failure, using certified...CR177- SKU:
- CR177
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
$151.95Qty in Cart: 0Quantity:Price:$151.95Subtotal:
