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!
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- Quantity
- Price
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Wiseco Piston Kit Yamaha XT500 1976-1981 4045M08700
WISECO
$239.95If you're running an XT500 and want measurable gains in power delivery and engine reliability, the Wiseco 4045M08700 piston kit is the upgrade that separates committed builders from casual riders. A 10:1 compression ratio paired with aerospace-grade...09102899- SKU:
- 09102899
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- STREET
- STROKE LENGTH METRIC:
- 84.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 499 CC
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 87.00 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$239.95 -
Wiseco 1996-2003 Kawasaki Jet Ski 1100 ZXi 809M08000
WISECO
$149.95The stock piston in your 1996-2003 Kawasaki Jet Ski 1100 ZXi is likely your biggest bottleneck for consistent power delivery and engine longevity. Wiseco's aerospace-grade forged aluminum construction handles the extreme thermal and mechanical demands of...809M08000- SKU:
- 809M08000
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- DISPLACEMENT:
- 743 CC
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 80.00 MM
- DISPLACEMENT:
- 1071 CC
- PRODUCT NAME:
- PISTON
$149.95 -
Wiseco Crankshaft Kit for Yamaha WR250F 2003-2013 WPC141
WISECO
$621.95A worn or failing crankshaft compromises engine reliability and performance across the board—power delivery suffers, bearing wear accelerates, and catastrophic failure becomes a real risk. The Wiseco WPC141 kit addresses this with a factory-assembled,...09210111- SKU:
- 09210111
- Availability:
- Ships Same Business Day
- Weight:
- 10.11 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$621.95 -
Wiseco KX100 1995-2013 Ring Set 53mm 2087CD
WISECO
$52.95Piston ring degradation is one of the fastest ways to lose compression, increase blow-by, and watch your engine's power output decline. The Wiseco KX100 Ring Set 2087CD delivers precision-engineered sealing that keeps combustion pressure where it...2087CD- SKU:
- 2087CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- SET
- DISPLACEMENT:
- 99 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 53.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$52.95 -
Wiseco Ring Set 52mm Kawasaki KFX80 2004-2006 Suzuki LT80 QuadSport 1987-2006 Yamaha RD200 1974-1976 Yamaha RT100 1990-2000 2047CD
WISECO
$52.95Piston rings are critical to engine sealing and compression—worn or improper rings will tank your power output and fuel efficiency. The Wiseco 2047CD ring set delivers precision-engineered compression for small-displacement engines, restoring lost...2047CD- SKU:
- 2047CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 52.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- DISPLACEMENT:
- 97 CC
- DISPLACEMENT:
- 98 CC
- RIDING STYLE:
- STREET
- UNITS:
- SET
$52.95 -
Wiseco Piston Kit 0.50mm Oversize 10.5:1 Compression Honda XR70R 1997-2003 4880M04750
WISECO
$134.95A worn or stock piston limits your XR70R's potential—restricting power delivery and throttle response when you need it most. The Wiseco 4880M04750 replaces that limitation with a forged-aluminum piston engineered for higher compression and better heat...09100748- SKU:
- 09100748
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +0.50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- DISPLACEMENT:
- 73 CC
- STROKE LENGTH METRIC:
- 41.40 MM
- BORE SIZE METRIC:
- 47.50 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
$134.95 -
On Sale
Wossner Top End Bearing for 1986-2006 Kawasaki KDX200 N1016
WOSSNER
MSRP: $18.50Now: $17.58Was: $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
MSRP: $18.50Now: $17.58Was: $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
$867.95 -
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 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 -
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 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 -
Hinson Racing Clutch Cover Honda CRF450X 2005-2017 C154X
HINSON RACING
$159.99Stock clutch covers on the CRF450X aren't designed for sustained high-performance riding—they trap heat and compromise durability when you're pushing hard on the track or trail. The Hinson Racing Clutch Cover eliminates this weakness with race-proven...09400738- SKU:
- 09400738
- Availability:
- Ships Same Business Day
- Weight:
- 0.72 LBS
- MODEL:
- BILLETPROOF
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$159.99 -
Hinson Racing Clutch Cover 2002-2016 Honda CRF450R C389
HINSON RACING
$159.99Factory clutch covers weren't engineered for sustained high-RPM racing environments—they overheat under load and compromise engagement consistency. The Hinson Racing Clutch Cover eliminates thermal buildup through strategic fin design and superior...09400818- SKU:
- 09400818
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
$159.99 -
Hinson Racing Clutch Cover for Yamaha YZ450F 2010-2022 C416
HINSON RACING
$159.99The stock clutch cover on your YZ450F can't handle sustained high-RPM heat cycles without thermal degradation—especially in closed-course racing or extended trail sessions. Hinson's C416 clutch cover dissipates heat more effectively than OEM designs,...09400982- SKU:
- 09400982
- Availability:
- Ships Same Business Day
- Weight:
- 0.86 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
$159.99 -
Hinson Racing Clutch Cover Kawasaki KX85 2001-2025 C068
HINSON RACING
$159.99Thermal management is critical when you're pushing a KX85 to its limits on the track. The Hinson Racing Clutch Cover dissipates heat more effectively than stock covers, keeping your clutch engagement consistent lap after lap. Built with racing-grade...09401035- SKU:
- 09401035
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- MODEL:
- BILLETPROOF
$159.99 -
Hinson Racing Clutch Cover for Yamaha YFZ450 2004-2013 C196
HINSON RACING
$159.99Stock clutch covers aren't engineered for sustained high-RPM racing conditions—they'll overheat and cause engagement inconsistencies when you need reliability most. The Hinson Racing Clutch Cover replaces that weakness with superior thermal management...C196- SKU:
- C196
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
$159.99 -
Hinson Racing Clutch Cover for Suzuki RM250 2002-2008 C046
HINSON RACING
$159.99Heat buildup is the silent killer of clutch performance, especially during sustained high-RPM riding or racing conditions. The Hinson Racing Clutch Cover for your RM250 combats this with superior thermal management and materials that outperform stock...C046X- SKU:
- C046X
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
- MATERIAL:
- T-6 ALUMINUM
- TYPE:
- CLUTCH
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$159.99
