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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Hot Cams Stage 2 Intake Camshaft for 2006-2018 Kawasaki KX450F 2187-2IN
HOT CAMS
$294.95If you're serious about extracting every bit of performance from your KX450F, the HOT CAMS Stage 2 Intake Camshaft is a direct path to measurable gains in horsepower and throttle response. This...09250555- SKU:
- 09250555
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- INTAKE DURATION IMPERIAL:
- 250°
- INTAKE LIFT METRIC:
- 9.91 MM
- TYPE:
- CAM
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
$294.95 -
Hot Cams Exhaust Camshaft for Kawasaki KX 450 F 2006-2015 2188-2E
HOT CAMS
$321.95If you're serious about extracting maximum performance from your KX 450 F, the Hot Cams 2188-2E Exhaust Camshaft is a direct bolt-on upgrade that rewires your engine's breathing characteristics. This...09250556- SKU:
- 09250556
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- EXHAUST LIFT METRIC:
- 10.80 MM
- TYPE:
- STAGE 2
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 259°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
$321.95 -
Hot Cams Stage 1 Intake Camshaft for 2008-2012 Kawasaki KLX450R 2196-1IN
HOT CAMS
$155.95The stock camshaft in your KLX450R leaves performance on the table. Hot Cams Stage 1 Intake Camshaft delivers measurable gains in mid-range torque and throttle response without requiring valve spring...09250563- SKU:
- 09250563
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- INTAKE DURATION IMPERIAL:
- 234°
- TYPE:
- CAM
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- INTAKE LIFT METRIC:
- 9.14 MM
- RIDING STYLE:
- OFF-ROAD
$155.95 -
Hot Cams Titanium Intake Valve for 2004-2009 Honda CRF250R 2004-2009 2012-2013 2015 Honda CRF250X 8400001-2
HOT CAMS
$105.95The intake valve is critical to your CRF's combustion efficiency—a worn or undersized valve directly impacts throttle response and peak power delivery. Hot Cams' forged titanium construction delivers...09262598- SKU:
- 09262598
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- BASE COLOR:
- SILVER
- COLOR/FINISH:
- TITANIUM
- MATERIAL:
- NITRIDE COATED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$105.95 -
Hot Cams Titanium Intake Valve for Honda CRF450R 2002-2008 8400002-2
HOT CAMS
$103.95Your CRF450R's intake valve is critical to cylinder head efficiency and overall engine performance. OEM valves wear under sustained racing loads, leading to reduced airflow, compression loss, and...09262601- SKU:
- 09262601
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- COLOR/FINISH:
- TITANIUM
- MATERIAL:
- NITRIDE COATED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BASE COLOR:
- SILVER
$103.95 -
Hot Cams Exhaust Valve 2004-2007 Honda CRF250R 8400001-1
HOT CAMS
$51.95The exhaust valve is one of the most thermally stressed components in your CRF250R's engine, and a worn or compromised valve directly reduces compression, throttle response, and overall reliability...09262902- SKU:
- 09262902
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- BLACK
- LENGTH METRIC:
- 82.00 MM
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- VALVE
- STEM DIAMETER METRIC:
- 4.970 MM
- UNITS:
- EACH
- OUTSIDE DIAMETER METRIC:
- 26.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$51.95 -
Hot Cams Steel Exhaust Valve for Honda CRF250R 2008-2009 8400001-5
HOT CAMS
$51.95Your CRF250R's exhaust valve is critical to engine breathing, combustion efficiency, and overall performance. A worn or inferior valve compromises compression, increases fuel consumption, and...09262903- SKU:
- 09262903
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- BLACK
- STEM DIAMETER METRIC:
- 4.460 MM
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- VALVE
- LENGTH METRIC:
- 82.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 26.00 MM
- UNITS:
- EACH
$51.95 -
Hot Cams Valve Shim Kit 8.90mm x 1.72mm for KTM 250 SX-F 2005-2022 5PK890172
HOT CAMS
$12.55Valve clearance directly impacts combustion efficiency, valve longevity, and overall engine reliability on your KTM 250 SX-F. Over time, valve shims wear and require replacement to maintain optimal...09261349- SKU:
- 09261349
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.72 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$12.55 -
Hot Cams Valve Shim 8.90 x 1.76 for KTM 250 SX-F 2005-2011 5PK890176
HOT CAMS
$12.55Valve clearance drift is inevitable with high-mileage or hard-running engines—and even small deviations will cost you horsepower and risk bent valves. Hot Cams valve shims give you precise, OEM-spec...09261350- SKU:
- 09261350
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.76 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$12.55 -
Hot Cams Valve Shim 8.90mm x 1.84mm for KTM 250 SX-F 2005-2011 5PK890184
HOT CAMS
$12.55Valve clearance directly impacts combustion efficiency, valve longevity, and engine reliability—especially in high-rev four-stroke engines like the KTM 250 SX-F. As shims wear or your build requires...09261352- SKU:
- 09261352
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.84 MM
$12.55 -
Hot Cams Valve Shim 8.90mm x 1.88mm for KTM 250 SX-F 2005-2011 5PK890188
HOT CAMS
$12.55Valve clearance directly impacts combustion efficiency, power delivery, and engine longevity—and worn or incorrect shims compromise all three. These HOT CAMS shims maintain precise clearance...09261353- SKU:
- 09261353
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.88 MM
- RIDING STYLE:
- UTV
- MATERIAL:
- STEEL
- 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
$12.55 -
Hot Cams Valve Shim 8.90mm x 1.96mm for KTM 250 SX-F 2005-2011 5PK890196
HOT CAMS
$12.55Valve clearance drift is inevitable in high-revving engines—especially in aggressive riding conditions. Hot Cams Valve Shims are essential wear items that restore proper valve-to-rocker clearance,...09261355- SKU:
- 09261355
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.96 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- OFF-ROAD
$12.55 -
Hot Cams Valve Shim 8.90mm x 2.00mm for KTM 250 SX-F 2005-2011 5PK890200
HOT CAMS
$12.55Valve clearance directly impacts combustion efficiency, ignition timing, and overall engine longevity. These HOT CAMS shims are precision-engineered to maintain exact clearance specifications on your...09261356- SKU:
- 09261356
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- SNOW
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
$12.55 -
Hot Cams Valve Shim 8.90mm x 2.56mm for KTM 250 SX-F 2005-2011 5PK890256
HOT CAMS
$11.95Valve clearance directly impacts combustion efficiency, throttle response, and engine longevity. Hot Cams valve shims maintain precise tolerances between your cam lobe and valve stem, preventing...09261370- SKU:
- 09261370
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.56 MM
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim 9.48mm x 1.20mm for Honda CRF450R 2002-2014 5PK948120
HOT CAMS
$11.50Valve clearance directly impacts combustion efficiency, power delivery, and engine longevity—especially in high-revving applications like the CRF450R. Hot Cams valve shims deliver the precision...09261372- SKU:
- 09261372
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM
$11.50 -
Hot Cams Valve Shim 9.48 x 1.40 for Honda CRF450R 2002-2023 5PK948140
HOT CAMS
$11.50Valve clearance directly impacts engine efficiency, combustion timing, and overall performance—and worn or incorrect shims compromise all three. The Hot Cams 9.48 x 1.40 shim pack gives you...09261376- SKU:
- 09261376
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.40 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
$11.50 -
Hot Cams Valve Shim 9.48mm x 1.45mm for Honda CRF450R 2002-2018 5PK948145
HOT CAMS
$11.50Valve clearance directly impacts combustion efficiency, noise levels, and engine longevity—and these HOT CAMS shims give you precise control over that critical tolerance. Whether you're rebuilding...09261377- SKU:
- 09261377
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.45 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
$11.50 -
Hot Cams Valve Shim 9.48mm x 1.50mm for Honda CRF450R 2002-2023 5PK948150
HOT CAMS
$11.50Valve clearance directly impacts engine performance, combustion efficiency, and component longevity—especially critical on high-revving engines like the CRF450R. Hot Cams valve shims ensure precise...09261378- SKU:
- 09261378
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 1.50 MM
$11.50 -
VERTEX Piston Ring 590280000001
VERTEX
$82.95Piston rings are critical wear items that directly impact engine compression, power delivery, and longevity. The VERTEX Piston Ring 590280000001 delivers superior durability through advanced surface...09120308- SKU:
- 09120308
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.98 MM
$82.95Qty in Cart: 0Quantity:Price:$82.95Subtotal: -
Wiseco Racer Elite 2-Stroke Piston Kit Husqvarna TC250 2014-2024 RE912M06640
WISECO
$277.95The Wiseco Racer Elite piston kit is purpose-built for the TC250's extreme combustion environment, delivering the reliability and power consistency that separates competitive racers from the rest. If...09105104- SKU:
- 09105104
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 66.40 MM
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
$277.95Qty in Cart: 0Quantity:Price:$277.95Subtotal:
