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 Yamaha RT100 1990-2000 52.00mm 771M05200
WISECO
$132.95A worn or damaged piston directly impacts your RT100's power delivery, fuel efficiency, and engine longevity. The Wiseco 771M05200 restores lost compression and combustion efficiency with precision-engineered, forged-aluminum construction designed...09100795- SKU:
- 09100795
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- DISPLACEMENT:
- 97 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 52.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 45.60 MM
- PISTON MATERIAL:
- FORGED
$132.95Qty in Cart: 0Quantity:Price:$132.95Subtotal: -
Wiseco Yamaha RT100 1990-2000 Piston Kit 52.50mm 771M05250
WISECO
$132.95If your Yamaha RT100 is wearing its original piston, you're leaving performance on the table. The Wiseco 771M05250 replaces worn or damaged pistons with precision-engineered components that restore throttle response, improve power delivery, and extend...09100796- SKU:
- 09100796
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
- DISPLACEMENT:
- 99 CC
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 52.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +0,50 MM
- STROKE LENGTH METRIC:
- 45.60 MM
$132.95 -
Wiseco Piston Kit Yamaha RT100 1990-2000 53mm Bore 771M05300
WISECO
$132.95When your 2-stroke demands reliability under sustained high-RPM load, a quality piston kit separates weekend warriors from serious competitors. The Wiseco 771M05300 delivers aerospace-grade forged aluminum construction with CNC precision, ensuring your...09100797- SKU:
- 09100797
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- DISPLACEMENT:
- 101,00 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 45.60 MM
$132.95Qty in Cart: 0Quantity:Price:$132.95Subtotal: -
Wiseco Piston Kit Standard Bore 54mm Yamaha YZ125 2005-2021 846M05400
WISECO
$174.95When your YZ125's original piston starts showing wear, power delivery suffers and reliability becomes a gamble. The Wiseco 846M05400 replaces it with aerospace-grade forged aluminum and precision coatings that restore—or exceed—factory performance while...09100799- SKU:
- 09100799
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GP STYLE
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wiseco Piston Kit Standard Bore 77mm 12.5:1 Compression Yamaha YZ250F 2005-2007 4882M07700
WISECO
$174.95If you're running a YZ250F between 2005-2007, factory pistons won't cut it for sustained high-RPM performance or competitive riding. The Wiseco 4882M07700 delivers the compression ratio and material quality needed to maximize horsepower, improve throttle...09100808- SKU:
- 09100808
- Availability:
- Ships Same Business Day
- Weight:
- 0.58 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 53.60 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
$174.95Qty in Cart: 0Quantity:Price:$174.95Subtotal: -
Wossner Top End Bearing for 1986-2006 Kawasaki KDX200 N1016
WOSSNER
$18.50The top-end bearing in your KDX200 endures constant high-speed stress, and a worn bearing compromises power delivery and can lead to catastrophic engine failure. This Wossner replacement restores factory precision fit and eliminates play in the...09240453- SKU:
- 09240453
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- CONNECTING ROD
- OUTSIDE DIAMETER METRIC:
- 21 MM
- LENGTH METRIC:
- 19.5 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER METRIC:
- 16 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- STREET
$18.50 -
Wrench Rabbit Complete Engine Rebuild Kit for 2007-2009 Honda CRF150R WR101-177
WRENCH RABBIT
$867.95When your Honda CRF150R engine reaches the end of its service life, a complete rebuild is the most cost-effective path to restoring full performance and reliability. The Wrench Rabbit Engine Rebuild Kit eliminates the guesswork of sourcing individual...09031305- SKU:
- 09031305
- Availability:
- Ships Same Business Day
- Weight:
- 10.80 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$867.95Qty in Cart: 0Quantity:Price:$867.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Honda CRF150R 2012-2016 WR101-178
WRENCH RABBIT
$867.95When your Honda CRF150R engine reaches the end of its service life, a complete rebuild kit eliminates the guesswork and ensures every critical component meets OEM specifications. The Wrench Rabbit WR101-178 bundles all the wear items and precision parts...09031306- SKU:
- 09031306
- Availability:
- Ships Same Business Day
- Weight:
- 9.15 LBS
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$867.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Honda CRF450X 2005-2009 2012-2016 WR101-179
WRENCH RABBIT
$1,132.95An engine rebuild is a critical investment in your Honda CRF450X's longevity and performance. The Wrench Rabbit Complete Engine Rebuild Kit eliminates guesswork by bundling every component you need—pistons, crankshaft, bearings, seals, and gaskets—into...09031307- SKU:
- 09031307
- Availability:
- Ships Same Business Day
- Weight:
- 17.10 LBS
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,132.95Qty in Cart: 0Quantity:Price:$1,132.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX250 2014-2016 WR101-175
WRENCH RABBIT
$1,211.95When your Kawasaki KX250 two-stroke demands a complete overhaul, settling for partial solutions risks reliability and performance. The Wrench Rabbit Complete Engine Rebuild Kit delivers everything needed for a professional-grade restoration in one...09031308- SKU:
- 09031308
- Availability:
- Ships Same Business Day
- Weight:
- 12.20 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,211.95Qty in Cart: 0Quantity:Price:$1,211.95Subtotal: -
Wrench Rabbit Complete Engine Rebuild Kit for 2015 Kawasaki KX450F WR101-174
WRENCH RABBIT
$1,211.95When your KX450F engine takes a hit, a quality rebuild kit is the difference between getting back on track quickly and facing weeks of downtime sourcing individual components. The Wrench Rabbit Complete Engine Rebuild Kit eliminates guesswork by pairing...09031309- SKU:
- 09031309
- Availability:
- Ships Same Business Day
- Weight:
- 16.05 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,211.95 -
Wrench Rabbit Kawasaki KX85 2014-2025 Complete Engine Rebuild Kit WR101-170
WRENCH RABBIT
$788.95When your Kawasaki KX85 two-stroke demands a full rebuild, you need OEM-quality components that won't compromise performance or reliability. The Wrench Rabbit WR101-170 delivers every critical internal component in a single kit, eliminating the guesswork...09031310- SKU:
- 09031310
- Availability:
- Ships Same Business Day
- Weight:
- 8.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
$788.95 -
Wrench Rabbit Engine Rebuild Kit for 2013-2015 Suzuki RM-Z250 WR101-169
WRENCH RABBIT
$1,249.95When your RM-Z250's engine shows signs of wear—whether it's loss of compression, bearing play, or general fatigue—a complete rebuild using OEM-quality components is the most cost-effective path to reliability. The Wrench Rabbit WR101-169 kit eliminates...09031314- SKU:
- 09031314
- Availability:
- Ships Same Business Day
- Weight:
- 12.60 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
$1,249.95 -
Wrench Rabbit Complete Engine Rebuild Kit Yamaha YZ250F 2014-2015 WR101-168
WRENCH RABBIT
$1,183.95When your Yamaha YZ250F's engine has accumulated hours on the track or trail, a complete rebuild with quality components is the most cost-effective way to restore reliability and performance. The Wrench Rabbit kit eliminates the guesswork of sourcing...09031315- SKU:
- 09031315
- Availability:
- Ships Same Business Day
- Weight:
- 12.25 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 4-STROKE
- FEATURES:
- STANDARD COMPRESSION PISTON
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$1,183.95Qty in Cart: 0Quantity:Price:$1,183.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for Kawasaki KX250 1992 WR101-111
WRENCH RABBIT
$867.95When your KX250's engine shows signs of wear, a full rebuild restores performance and reliability without the guesswork of sourcing individual components. The Wrench Rabbit Engine Rebuild Kit for Kawasaki KX250 1992 consolidates all critical internal...09031085- SKU:
- 09031085
- Availability:
- Ships Same Business Day
- Weight:
- 14.15 LBS
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$867.95 -
Wrench Rabbit Complete Engine Rebuild Kit for Kawasaki KX250 2004 WR101-115
WRENCH RABBIT
$895.95A two-stroke engine rebuild demands precision components that work together seamlessly—this kit eliminates the guesswork by bundling OEM-quality parts engineered specifically for your KX250. Whether you're refreshing a worn powerplant or rebuilding after...09031089- SKU:
- 09031089
- Availability:
- Ships Same Business Day
- Weight:
- 14.40 LBS
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$895.95Qty in Cart: 0Quantity:Price:$895.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - Standard 010-827-10
WSM
$241.36A top-end rebuild demands precision components that restore—or exceed—OEM performance standards. The WSM Original Series kit supplies everything needed for a complete piston-to-gasket restoration, eliminating the guesswork of sourcing individual...09030123- SKU:
- 09030123
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- BORE SIZE METRIC:
- 81.00 MM
- PISTON SIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- TOP END
$241.36 -
XCELDYNE Intake Valve Springs PSIMX2006
XCELDYNE
$75.57If you're serious about extracting maximum horsepower from your engine, valve spring selection is non-negotiable. The XCELDYNE Intake Valve Springs PSIMX2006 deliver measurable performance gains through a precision low-drag design that reduces parasitic...09261269- SKU:
- 09261269
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING
- UNITS:
- PAIR
$75.57 -
XCELDYNE Exhaust Valve Springs PSIMX2008
XCELDYNE
$75.57Exhaust valve springs are critical to maintaining consistent valve sealing and preventing float at high RPMs—especially in offroad applications where engine stress and thermal cycling push standard components to their limits. The XCELDYNE PSIMX2008 is...09261271- SKU:
- 09261271
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
$75.57Qty in Cart: 0Quantity:Price:$75.57Subtotal: -
XCELDYNE X2 Titanium Valve - Intake X2TIVM42004
XCELDYNE
$110.19Off-road performance demands valves engineered for both maximum flow and maximum durability—the XCELDYNE X2 Titanium Valve delivers both without compromise. Built with a high-flow design and full CrN coating, this intake valve resists wear and thermal...09262887- SKU:
- 09262887
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE TRAIN KIT
- UNITS:
- KIT
$110.19
