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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BOYESEN Impeller Pump YZ125 WPI-31
BOYESEN
$79.95Stock cooling systems on the YZ125 struggle to handle sustained high-RPM racing conditions, leaving your engine vulnerable to thermal stress and performance loss. The BOYESEN Impeller Pump WPI31...WPI31- SKU:
- WPI31
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MODEL:
- SUPERCOOLER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- IMPELLER
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$79.95Qty in Cart: 0Quantity:Price:$79.95Subtotal: -
BOYESEN Impeller/Waterpump Cover - Magnesium WPK-17M
BOYESEN
$229.95Engine temperature stability is critical to reliability and longevity, especially under sustained racing conditions or heavy load. The BOYESEN WPK-17M water pump cover and impeller upgrade increases...09400247- SKU:
- 09400247
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- MATERIAL:
- ALUMINUM
- TYPE:
- WATER PUMP
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- MAGNESIUM
- UNITS:
- KIT
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPERCOOLER
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- RIDING STYLE:
- OFF-ROAD
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
HOT RODS Top End Bearing WB107
HOT RODS
$23.05The HOT RODS Top End Bearing WB107 is a precision needle-cage bearing engineered for the piston end of your connecting rod, where load transfer and rotational speed demand uncompromising durability...09240568- SKU:
- 09240568
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- WRIST PIN
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
$23.05 -
HOT RODS Top End Bearing WB108
HOT RODS
$23.05The HOT RODS Top End Bearing WB108 is a precision needle-cage bearing engineered to handle the extreme reciprocating forces at the piston end of your connecting rod. This bearing is critical to...09240569- SKU:
- 09240569
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- BEARING
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WRIST PIN
- UNITS:
- EACH
$23.05 -
HOT RODS Top End Bearing WB120
HOT RODS
$24.10The HOT RODS Top End Bearing WB120 is engineered to handle the extreme pressures and reciprocating loads at the piston end of your connecting rod. A quality top-end bearing directly impacts engine...09240574- SKU:
- 09240574
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CONNECTING ROD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WRIST PIN
- UNITS:
- EACH
- PRODUCT NAME:
- BEARING
$24.10 -
HOT RODS Crank Bearings K005
HOT RODS
$118.95A crankshaft assembly is only as reliable as its bearings—and cheap bearing kits are a false economy that can cost you race wins or engine rebuilds. HOT RODS K005 Crank Bearings deliver...09240025- SKU:
- 09240025
- Availability:
- Ships Same Business Day
- Weight:
- 1.38 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- RIDING STYLE:
- STREET
$118.95 -
HOT RODS Crank Bearings K008
HOT RODS
$65.95A crankshaft is only as reliable as its bearings. The HOT RODS K008 Crank Bearings deliver precision-engineered support for your crankshaft assembly, ensuring proper load distribution, minimal...09240030- SKU:
- 09240030
- Availability:
- Ships Same Business Day
- Weight:
- 0.67 LBS
- PRODUCT NAME:
- BEARING
- TYPE:
- BALL
- APPLICATION:
- MAIN CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$65.95Qty in Cart: 0Quantity:Price:$65.95Subtotal: -
COMETIC Top End Gasket Set - Gas Gas C3261
COMETIC
$56.95A failed top-end gasket will strand you on the track or trail, compromising compression and power when you need it most. The COMETIC C3261 Top End Gasket Set delivers the sealing integrity demanded...09344128- SKU:
- 09344128
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$56.95 -
Hot Cams Cam Chain for Kawasaki KX450F 2006-2008 and KLX450R 2008-2009 HC98XRH2010124
HOT CAMS
$62.95A worn or undersized cam chain compromises valve timing precision and can lead to catastrophic engine damage—especially in high-revving four-stroke applications like the KX450F and KLX450R. The HOT...09250765- SKU:
- 09250765
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- MODEL:
- SILENT
- RIDING STYLE:
- STREET
- BASE FINISH:
- RAW
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- CHAIN SIZE:
- 98XRH2010
- PRODUCT NAME:
- CHAIN
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- UNITS:
- EACH
$62.95 -
Hot Cams Cam Chain for Husqvarna FC450 2016-2018 and KTM 450 SX-F 2016-2018 HC92RH2015108
HOT CAMS
$77.95A worn or failing cam chain compromises valve timing and engine reliability—especially critical in high-stress racing and performance applications. The HOT CAMS HC92RH2015108 delivers heat-treated...09250822- SKU:
- 09250822
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BASE FINISH:
- RAW
- CHAIN SIZE:
- 92RH2015
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- CHAIN
- MODEL:
- SILENT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- UNITS:
- EACH
$77.95 -
Hot Cams Stage 1 Intake Camshaft for 2010-2018 Suzuki RM-Z250 2200-1IN
HOT CAMS
$264.95Stock camshaft profiles limit your RM-Z250's potential across the RPM band—especially if you're chasing consistent mid-range pull or outright peak horsepower on the track. The Hot Cams Stage 1 Intake...09250656- SKU:
- 09250656
- Availability:
- Ships Same Business Day
- Weight:
- 0.87 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAMSHAFT
- INTAKE LIFT METRIC:
- 9.40 MM
- UNITS:
- EACH
- INTAKE DURATION IMPERIAL:
- 237°
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Hot Cams Exhaust Camshaft for Suzuki RM-Z250 2010-2018 2201-1E
HOT CAMS
$289.95If you're serious about maximizing the performance potential of your RM-Z250, the Hot Cams Exhaust Camshaft 2201-1E is a critical upgrade. This stage-tuned camshaft delivers measurable gains in...09250657- SKU:
- 09250657
- Availability:
- Ships Same Business Day
- Weight:
- 1.04 LBS
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- EXHAUST DURATION IMPERIAL:
- 239°
- UNITS:
- EACH
- EXHAUST LIFT METRIC:
- 8.38 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Hot Cams Stage 2 Intake Camshaft for Suzuki RM-Z250 2010-2018 2203-2IN
HOT CAMS
$264.95If you're running a 2010-2018 Suzuki RM-Z250, camshaft selection directly controls how your engine breathes—and the Hot Cams Stage 2 is engineered to extract measurable gains in horsepower and...09250659- SKU:
- 09250659
- Availability:
- Ships Same Business Day
- Weight:
- 0.83 LBS
- INTAKE DURATION IMPERIAL:
- 256°
- INTAKE LIFT METRIC:
- 9.40 MM
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- UNITS:
- EACH
$264.95Qty in Cart: 0Quantity:Price:$264.95Subtotal: -
Hot Cams Exhaust Camshaft Stage 2 for Suzuki RM-Z 250 2010-2018 2204-2E
HOT CAMS
$297.95If you're running a 2010-2018 Suzuki RM-Z 250 and serious about extracting peak horsepower, the Hot Cams Exhaust Camshaft Stage 2 (2204-2E) is the upgrade that separates competitive racers from the...09250660- SKU:
- 09250660
- Availability:
- Ships Same Business Day
- Weight:
- 1.01 LBS
- EXHAUST DURATION IMPERIAL:
- 244°
- EXHAUST LIFT METRIC:
- 8.89 MM
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$297.95Qty in Cart: 0Quantity:Price:$297.95Subtotal: -
Hot Cams Exhaust Camshaft for Kawasaki KX250F 2011-2016 2219-1E
HOT CAMS
$302.95If you're serious about extracting maximum performance from your KX250F, a quality exhaust camshaft is one of the most effective upgrades available. The Hot Cams 2219-1E delivers measurable gains in...09250662- SKU:
- 09250662
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- EXHAUST LIFT METRIC:
- 8.38 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 239°
$302.95Qty in Cart: 0Quantity:Price:$302.95Subtotal: -
VERTEX Piston Ring 590281000001
VERTEX
$85.00Worn piston rings compromise compression, increase blowby, and rob your engine of power and efficiency. VERTEX Piston Ring 590281000001 restores ring sealing to factory specifications, whether you're...09120309- SKU:
- 09120309
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- PISTON DIAMETER METRIC:
- 80.98 MM
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
$85.00 -
VERTEX Wrist Pin - CR/YZ/SX/KX/RM 715372
VERTEX
$10.45Wrist pin failure under high RPM can cost you races and damage your engine. The VERTEX 715372 uses nitride-coated case hardening to eliminate wear and galling while maintaining dimensional...09130038- SKU:
- 09130038
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- PISTON
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- WRIST PIN
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$10.45 -
VERTEX Wrist Pin - RMZ/KXF/CRF/SF 715380
VERTEX
$16.95Wrist pin wear is a silent killer in high-revving engines—once it starts, catastrophic failure follows quickly. The VERTEX Wrist Pin delivers case-hardened durability through nitride coating...09130042- SKU:
- 09130042
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- PISTON
- PRODUCT NAME:
- WRIST PIN
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$16.95Qty in Cart: 0Quantity:Price:$16.95Subtotal: -
VERTEX Piston Ring 53010006400
VERTEX
$37.75Piston rings are critical wear items that directly impact engine compression, blow-by control, and overall performance—worn or damaged rings will cost you power and reliability. The VERTEX Piston...09120174- SKU:
- 09120174
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON DIAMETER METRIC:
- 63.95 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$37.75 -
VERTEX Piston Ring 53010006640
VERTEX
$47.20Piston rings are critical wear items that directly impact compression, blow-by, and overall engine efficiency. The VERTEX Piston Ring 53010006640 delivers extended durability through advanced surface...09120175- SKU:
- 09120175
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 66.36 MM
$47.20
