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
-
Wrench Rabbit Complete Engine Rebuild Kit for 2001 Yamaha YZ250 WR101-127
WRENCH RABBIT
$895.95When your 2001 Yamaha YZ250 demands a complete overhaul, settling for piecemeal replacements wastes time and risks inconsistent performance. The Wrench Rabbit Complete Engine Rebuild Kit delivers every critical component you need in one package—piston,...09031101- SKU:
- 09031101
- Availability:
- Ships Same Business Day
- Weight:
- 15.45 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$895.95 -
Wrench Rabbit Engine Rebuild Kit for 1990-1991 Honda CR125R WR101-130
WRENCH RABBIT
$711.95When your Honda CR125R's engine reaches the end of its service life, a complete rebuild restores full performance and reliability without the cost of replacement. The Wrench Rabbit Engine Rebuild Kit bundles all the critical internal components—pistons,...09031104- SKU:
- 09031104
- Availability:
- Ships Same Business Day
- Weight:
- 11.40 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$711.95 -
Wrench Rabbit Engine Rebuild Kit for 1992-1995 Honda CR125R WR101-131
WRENCH RABBIT
$711.95A two-stroke engine rebuild demands precision and completeness—one overlooked component means wasted time and money. The Wrench Rabbit Engine Rebuild Kit for your 1992-1995 Honda CR125R eliminates guesswork by bundling every critical internal component...09031105- SKU:
- 09031105
- Availability:
- Ships Same Business Day
- Weight:
- 10.32 LBS
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
$711.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 1996-1997 Honda CR125R WR101-132
WRENCH RABBIT
$711.95A two-stroke engine rebuild demands precision components that can withstand the demands of competitive riding and high-rpm operation. The Wrench Rabbit Complete Engine Rebuild Kit for 1996-1997 Honda CR125R eliminates the guesswork of sourcing individual...09031106- SKU:
- 09031106
- Availability:
- Ships Same Business Day
- Weight:
- 10.40 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$711.95 -
Wrench Rabbit Engine Rebuild Kit Kawasaki KX65 2006-2012 WR101-051
WRENCH RABBIT
$592.95Two-stroke engines demand precision during rebuild, and cutting corners on component quality will cost you performance and reliability. The Wrench Rabbit Engine Rebuild Kit delivers every critical component you need in one package—piston, crank,...09030989- SKU:
- 09030989
- Availability:
- Ships Same Business Day
- Weight:
- 7.55 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MODEL:
- WRENCH RABBIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$592.95 -
Wrench Rabbit Engine Rebuild Kit 2002-2004 Honda CR250R WR101-015
WRENCH RABBIT
$828.95A two-stroke engine rebuild demands precision components that work together as a system—not mismatched parts that compromise reliability. This Wrench Rabbit kit eliminates guesswork by pairing OEM-quality pistons, crankshafts, and bearing assemblies from...09030955- SKU:
- 09030955
- Availability:
- Ships Same Business Day
- Weight:
- 14.10 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- MODEL:
- WRENCH RABBIT
- ENGINE TYPE:
- 2-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$828.95 -
Vertex Engine Rebuild Kit for 2016-2017 Honda CRF250R WR101-219
WRENCH RABBIT
$1,092.95When your Honda CRF250R's engine shows signs of wear—lost compression, increased blowby, or declining power delivery—a complete engine rebuild is the most cost-effective path to restored performance. The Vertex Engine Rebuild Kit for 2016-2017 models...09030959- SKU:
- 09030959
- Availability:
- Ships Same Business Day
- Weight:
- 12.70 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
$1,092.95 -
WSM Motor Mount - U150 011-102
WSM
$51.13Worn or damaged motor mounts compromise engine stability, increase vibration transfer to the chassis, and can accelerate wear on surrounding components. The WSM Motor Mount U150 011-102 restores OEM-level isolation and support, ensuring your engine stays...09330006- SKU:
- 09330006
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
$51.13 -
WSM Left Motor Mount - 4 TEC 011-130
WSM
$75.07Worn or damaged motor mounts compromise engine stability, increase vibration transfer to the chassis, and can accelerate wear on surrounding components. The WSM Left Motor Mount restores factory-spec support and isolation, reducing NVH (noise, vibration,...09330008- SKU:
- 09330008
- Availability:
- Ships Same Business Day
- Weight:
- 0.66 LBS
- PRODUCT NAME:
- MOUNT
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
$75.07 -
WSM Motor Mount - 4 TEC 011-131
WSM
$63.38Worn or damaged motor mounts compromise engine stability, increase vibration transfer to the chassis, and can lead to costly drivetrain misalignment over time. The WSM Motor Mount 4 TEC 011-131 restores OEM-specification support, reducing unwanted...09330009- SKU:
- 09330009
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- PRODUCT NAME:
- MOUNT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- ENGINE
- UNITS:
- EACH
$63.38 -
WSM Long Shaft Pump - Sea-Doo 010-090
WSM
$47.54A failing oil pump compromises engine lubrication and accelerates wear on critical internal components—especially in high-performance Sea-Doo engines running extended hours or aggressive conditions. The WSM Long Shaft Pump (010-090) is a direct...09320077- SKU:
- 09320077
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- TYPE:
- OIL PUMP
- UNITS:
- EACH
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- WATERCRAFT
$47.54 -
WSM Short Shaft Pump - Sea-Doo 010-091
WSM
$45.48A failing or worn oil pump directly compromises engine lubrication and can lead to catastrophic bearing damage in Sea-Doo PWCs. The WSM Short Shaft Pump (010-091) is a direct OEM-equivalent replacement that restores proper oil delivery and protects your...09320078- SKU:
- 09320078
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- EACH
- TYPE:
- OIL PUMP
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- WATERCRAFT
$45.48 -
WSM Short Shaft Pump - Sea-Doo 010-092
WSM
$45.48A failing oil pump compromises lubrication across your entire engine, risking catastrophic bearing wear and potential seizure during high-performance operation. The WSM Short Shaft Pump (010-092) delivers reliable oil circulation to critical engine...09320079- SKU:
- 09320079
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- UNITS:
- EACH
- PRODUCT NAME:
- SHAFT
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- OIL PUMP
$45.48 -
WSM Pump Rotor - 4-TEC - Sea-Doo 010-093
WSM
$28.92A failing oil pump rotor compromises lubrication delivery to critical engine components, risking catastrophic bearing wear and engine seizure. The WSM Pump Rotor is a direct OEM replacement engineered to restore proper oil circulation and protect your...09320080- SKU:
- 09320080
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- TYPE:
- OIL PUMP
- UNITS:
- EACH
- PRODUCT NAME:
- ROTOR
- RIDING STYLE:
- WATERCRAFT
$28.92 -
WSM Cylinder Kit - Yamaha 010-6029K
WSM
$766.42The WSM Cylinder Kit 010-6029K delivers OEM-matched performance and reliability without compromise. Whether you're rebuilding after a race season or restoring your engine to factory specifications, this kit ensures precise fitment and durability across...09310530- SKU:
- 09310530
- Availability:
- Ships Same Business Day
- Weight:
- 7.81 LBS
- PRODUCT NAME:
- CYLINDER KIT
- CYLINDER BORE COATING:
- NIKASIL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$766.42 -
WSM Power Valve with Safety Link 010-497-01
WSM
$113.84Exhaust scavenging efficiency directly impacts horsepower delivery and throttle response—the WSM Power Valve with Safety Link optimizes backpressure across your entire RPM range to unlock gains you can feel. By dynamically tuning exhaust flow, this valve...09262253- SKU:
- 09262253
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- POWER VALVE
- UNITS:
- EACH
- RIDING STYLE:
- WATERCRAFT
$113.84 -
WSM Crankshaft Assembly 010-1028WSM
WSM
$908.90A quality crankshaft assembly is the backbone of reliable engine performance, directly impacting power delivery, durability, and overall engine longevity. The WSM 010-1028WSM is precision-engineered to meet or exceed OEM specifications, making it an...09210483- SKU:
- 09210483
- Availability:
- Ships Same Business Day
- Weight:
- 28.95 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$908.90 -
WSM Crankshaft Assembly 010-1028-01WSM
WSM
$1,165.75A quality crankshaft is the backbone of engine reliability and performance—if yours is worn, damaged, or you're rebuilding from the ground up, this WSM assembly delivers the precision you need without compromise. Trued to OEM specifications and ready for...09210484- SKU:
- 09210484
- Availability:
- Ships Same Business Day
- Weight:
- 42.80 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
$1,165.75 -
WSM Crankshaft Assembly 010-1060WSM
WSM
$802.26A crankshaft assembly is the backbone of your engine's bottom end—it converts reciprocating piston motion into rotational power, making its precision and durability absolutely critical to engine performance and longevity. The WSM 010-1060WSM is...09210485- SKU:
- 09210485
- Availability:
- Ships Same Business Day
- Weight:
- 24.10 LBS
- PRODUCT NAME:
- CRANKSHAFT
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- STEEL
- UNITS:
- EACH
$802.26 -
WSM Ring Set 010-909
WSM
$43.40Precision ring sealing is fundamental to engine performance and longevity—inadequate compression and oil control lead to power loss, increased blowby, and accelerated wear. The WSM Ring Set 010-909 delivers OEM-grade sealing with tight tolerances and...09120260- SKU:
- 09120260
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- SET
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM
$43.40
