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
-
MOOSE RACING Oil Seal Set - DRZ200 822226
MOOSE RACING
$37.21Engine seal degradation is one of the most common causes of oil leakage and contamination in older or high-mileage machines. The MOOSE RACING Oil Seal Set eliminates the need to source individual...09351149- SKU:
- 09351149
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SEAL KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- ENGINE
- TYPE:
- OIL
$37.21Qty in Cart: 0Quantity:Price:$37.21Subtotal: -
Pro Filter Suzuki DR250 1982-1993 Oil Filter PF-136
PRO FILTER
$6.99Keep your DR250's engine running clean and protected with the PRO FILTER PF-136, engineered to meet OEM standards while delivering superior filtration under demanding conditions. This micro-pore...07120572- SKU:
- 07120572
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- CHROME
- RIDING STYLE:
- STREET
- STYLE:
- PREMIUM
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE FINISH:
- CHROME
$6.99 -
Pro Filter 2004-2007 Arctic Cat 400 4x4 Auto LE Oil Filter PF-138B
PRO FILTER
$12.99Keep your Arctic Cat 400 running clean and protected with the PRO FILTER PF-138B, engineered to exceed OEM specifications and handle the demands of serious off-road use. This high-performance filter...07120574- SKU:
- 07120574
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BASE COLOR:
- BLACK
- RIDING STYLE:
- UTV
- STYLE:
- PREMIUM
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$12.99Qty in Cart: 0Quantity:Price:$12.99Subtotal: -
HOT RODS Crankshaft 4093
HOT RODS
$465.95If you're building a long-stroke engine for your ATV, the HOT RODS Crankshaft 4093 eliminates the guesswork and machine work typically required to achieve reliable, high-performance results. This...09210213- SKU:
- 09210213
- Availability:
- Ships Same Business Day
- Weight:
- 9.94 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MODEL:
- 4-CYCLE
- DISPLACEMENT:
- 450 CC
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.10 MM
- UNITS:
- ASSEMBLY
$465.95Qty in Cart: 0Quantity:Price:$465.95Subtotal: -
COMETIC Bottom End Gasket Set - Honda C3322
COMETIC
$38.95A quality bottom end gasket set is non-negotiable when rebuilding or refreshing your engine—cheap seals lead to oil leaks, contamination, and catastrophic failures. The COMETIC C3322 delivers...09344143- SKU:
- 09344143
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 71.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
$38.95 -
Hot Cams Exhaust Camshaft for Kawasaki KX 250 F 2011-2016 2221-2E
HOT CAMS
$338.05If you're running a KX 250 F and want measurable gains in midrange torque and top-end horsepower, a quality exhaust camshaft is one of the most direct upgrades available. The HOT CAMS 2221-2E is...09250664- SKU:
- 09250664
- Availability:
- Ships Same Business Day
- Weight:
- 1.71 LBS
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 245°
- UNITS:
- EACH
- EXHAUST LIFT METRIC:
- 9.65 MM
- TYPE:
- STAGE 2
$338.05 -
Hot Cams Stage 3 Camshaft for 2009 Honda CRF450R 1125-3
HOT CAMS
$220.95The stock camshaft in your 2009 Honda CRF450R limits what your engine can deliver. Hot Cams Stage 3 replaces those constraints with measurable gains in torque, horsepower, and throttle response—all...09250461- SKU:
- 09250461
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INTAKE LIFT METRIC:
- 10.40 MM
- APPLICATION:
- EXHAUST
- EXHAUST LIFT METRIC:
- 9.00 MM
- INTAKE DURATION IMPERIAL:
- 252°
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 3
- EXHAUST DURATION IMPERIAL:
- 265°
$220.95Qty in Cart: 0Quantity:Price:$220.95Subtotal: -
Hot Cams Valve Shim 9.48 x 2.60 for Honda CRF450R 2002-2012 5PK948260
HOT CAMS
$11.50Valve clearance directly impacts combustion efficiency, valve longevity, and overall engine performance—even slight deviations can cause power loss or premature wear. The Hot Cams Valve Shim 9.48 x 2...09261400- SKU:
- 09261400
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.60 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$11.50 -
Hot Cams Valve Shim 9.48mm x 2.90mm for 2006-2014 Yamaha YZ450F 5PK948290
HOT CAMS
$11.50Valve clearance drift is inevitable on high-performance machines—especially on demanding 450cc four-strokes like the YZ450F. Hot Cams valve shims allow you to dial in precise clearances during...09261406- SKU:
- 09261406
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- UTV
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.90 MM
$11.50 -
Hot Cams Valve Shim 9.48mm x 2.95mm for Honda CRF450R 2002-2014 5PK948295
HOT CAMS
$11.50Valve clearance directly impacts combustion efficiency, valve longevity, and engine reliability—and worn or improperly sized shims compromise all three. The Hot Cams 9.48mm x 2.95mm shim five-pack...09261407- SKU:
- 09261407
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- VALVE SHIM THICKNESS METRIC:
- 2.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$11.50 -
On Sale
PROX Piston Kit 01.1408.200
PROX
MSRP: $185.95Now: $158.00Was: $185.95Worn or damaged pistons compromise engine efficiency, reliability, and performance—especially in high-stress racing applications. The PROX Piston Kit 011408200 restores your engine to OEM...09030821- SKU:
- 09030821
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 91.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON SIZE METRIC:
- +2.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
MSRP: $185.95Now: $158.00Was: $185.95Qty in Cart: 0Quantity:Price:MSRP: $185.95Now: $158.00Was: $185.95Subtotal: -
VERTEX Piston Kit - Standard 22877B
VERTEX
$127.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Piston Kit 22877B delivers the durability and thermal stability your engine demands. Built with...09100941- SKU:
- 09100941
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
Wiseco Crankshaft Kit for 1992-2001 Kawasaki KX250 WPC128B
WISECO
$510.95A crankshaft is the backbone of your KX250's bottom end—when you're pushing peak RPMs on the track or trail, you need a unit that won't compromise under load. The Wiseco WPC128B delivers...09210109- SKU:
- 09210109
- Availability:
- Ships Same Business Day
- Weight:
- 12.51 LBS
- TYPE:
- BOTTOM END
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES BEARING AND GASKET
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
$510.95Qty in Cart: 0Quantity:Price:$510.95Subtotal: -
Wiseco KX100 1995-2013 Ring Set 2067CD
WISECO
$52.95OEM ring sets wear predictably under load, leading to increased blow-by, oil consumption, and power loss—especially critical if you're running your KX100 hard. The Wiseco 2067CD delivers...2067CD- SKU:
- 2067CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 99 CC
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 52.50 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
$52.95 -
Wiseco Piston Ring Set 58mm Bore for Yamaha YZ125 1976-1988 2005-2021 2020-2022 YZ125X 2284CS
WISECO
$25.95Worn or damaged piston rings directly compromise compression, power delivery, and engine longevity—especially in high-RPM YZ125 applications. The Wiseco 2284CS ring set restores OEM-spec compression...2284CS- SKU:
- 2284CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 58.00 MM
- DISPLACEMENT:
- 125 CC
- DISPLACEMENT:
- 144 CC
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$25.95 -
Wiseco Piston Honda CRF450R 2002-2008 338M07050
WISECO
$210.95When you're pushing a Honda CRF450R to its limits, your piston needs to handle extreme combustion pressures and sustained high RPMs without compromise. The Wiseco 338M07050 is precision-engineered to...338M07050- SKU:
- 338M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.40 MM
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- DISPLACEMENT:
- 248 CC
- RIDING STYLE:
- UTV
- BORE SIZE METRIC:
- 70.50 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.45 MM
- SKIRT COATING:
- NON-COATED
$210.95 -
Wiseco Piston Kit Honda CR125M 1974-1978 1.0mm 339M05700
WISECO
$162.95If you're rebuilding a 1974-1978 Honda CR125M, a quality piston kit is non-negotiable—it directly impacts compression, power delivery, and engine longevity. Wiseco's 339M05700 delivers the precision...339M05700- SKU:
- 339M05700
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 57.00 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.94 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 50.00 MM
$162.95Qty in Cart: 0Quantity:Price:$162.95Subtotal: -
Wrench Rabbit Engine Rebuild Kit for KTM 150 SX 2014-2015 WR101-173
WRENCH RABBIT
$1,092.95When your KTM 150 SX two-stroke has logged serious track time, an engine rebuild isn't optional—it's essential for maintaining peak performance and reliability. The Wrench Rabbit Engine Rebuild Kit...09031313- SKU:
- 09031313
- Availability:
- Ships Same Business Day
- Weight:
- 10.70 LBS
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$1,092.95Qty in Cart: 0Quantity:Price:$1,092.95Subtotal: -
WSM Top-End Rebuild Kit - Original Series - .50 mm 010-827-12
WSM
$229.87A top-end rebuild demands precision components that restore your engine to factory specifications—or beyond. The WSM Original Series Top-End Rebuild Kit delivers complete piston assemblies and gasket...09030124- SKU:
- 09030124
- Availability:
- Ships Same Business Day
- Weight:
- 3.00 LBS
- TYPE:
- TOP END
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 81.50 MM
- MODEL:
- ORIGINAL SERIES
- PISTON SIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- REBUILD KIT
$229.87Qty in Cart: 0Quantity:Price:$229.87Subtotal: -
Hinson Racing Clutch Cover Suzuki RM-Z450 2008-2025 C330
HINSON RACING
$169.99Stock clutch covers on the RM-Z450 struggle to manage heat during sustained high-RPM racing, leading to inconsistent engagement and premature wear. The Hinson Racing Clutch Cover C330 solves this...09400816- SKU:
- 09400816
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- PRODUCT NAME:
- COVER
- MATERIAL:
- T-6 ALUMINUM
- TYPE:
- CLUTCH
- UNITS:
- EACH
- MODEL:
- BILLETPROOF
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
$169.99
