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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KIBBLEWHITE Exhaust Valve - Kawasaki 40-40143T
KIBBLEWHITE
$92.51High-revving engines demand valves that can withstand extreme thermal and mechanical stress without compromise. KIBBLEWHITE Tensilite® exhaust valves are engineered from premium titanium forgings and finished with a specialized coating that reduces...09262747- SKU:
- 09262747
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- STEM DIAMETER IMPERIAL:
- 0.1756'
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 25°
- HEAD DIAMETER METRIC:
- 25.00 MM
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
$92.51 -
KIBBLEWHITE Exhaust Valve - KTM 96-96166T
KIBBLEWHITE
$100.95Exhaust valves are critical to engine efficiency, and cheap units fail under the thermal and mechanical stress of sustained performance. KIBBLEWHITE's Tensilite® exhaust valves deliver the durability and reliability your engine demands, whether you're...09262753- SKU:
- 09262753
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- MATERIAL:
- TITANIUM
- TULIP ANGLE:
- 30°
- HEAD DIAMETER METRIC:
- 31.70 MM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.2353'
- RIDING STYLE:
- OFF-ROAD
$100.95 -
KIBBLEWHITE Intake Valve - KTM 96-96212T
KIBBLEWHITE
$134.56Intake valve performance directly impacts combustion efficiency and engine longevity—especially in high-RPM applications where thermal stress and wear accelerate rapidly. Kibblewhite's Tensilite® valves are precision-forged from aerospace-grade titanium...09262754- SKU:
- 09262754
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- HEAD DIAMETER METRIC:
- 39.95 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
- TULIP ANGLE:
- 15°
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- MODEL:
- TENSILITE®
- UNITS:
- EACH
$134.56 -
KIBBLEWHITE Intake Valve - Suzuki 60-60210T
KIBBLEWHITE
$92.51Intake valve performance directly impacts cylinder fill efficiency, combustion quality, and overall engine reliability—especially under high RPM and boost conditions. The Kibblewhite Tensilite® intake valve delivers the material science and precision...09262756- SKU:
- 09262756
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 31.00 MM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.1765'
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- MATERIAL:
- TITANIUM
$92.51 -
KIBBLEWHITE Exhaust Valve - Suzuki 60-60213T
KIBBLEWHITE
$92.51Exhaust valves are the foundation of reliable engine performance—they control combustion timing and durability under extreme heat and pressure. The KIBBLEWHITE Tensilite® exhaust valve replaces weak OEM components with a one-piece titanium forging...09262757- SKU:
- 09262757
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- TENSILITE®
- TULIP ANGLE:
- 25°
- HEAD DIAMETER METRIC:
- 25.00 MM
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.1756'
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
$92.51 -
KIBBLEWHITE Exhaust Valve - Suzuki 60-60516T
KIBBLEWHITE
$109.33Exhaust valves are a critical wear item in high-revving engines, and stock components often can't handle sustained performance demands. The KIBBLEWHITE Tensilite® exhaust valve delivers superior heat resistance and durability through advanced titanium...09262759- SKU:
- 09262759
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- MATERIAL:
- TITANIUM
- STEM DIAMETER IMPERIAL:
- 0.1760'
- HEAD DIAMETER METRIC:
- 25.00 MM
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 25°
- APPLICATION:
- EXHAUST
- MODEL:
- TENSILITE®
$109.33 -
KIBBLEWHITE Intake Valve - Suzuki 60-60712T
KIBBLEWHITE
$109.33Intake valve performance directly impacts combustion efficiency, throttle response, and overall engine reliability under sustained high RPM operation. The Kibblewhite Tensilite® valve delivers superior durability and thermal stability compared to...09262760- SKU:
- 09262760
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- TITANIUM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 20°
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- HEAD DIAMETER METRIC:
- 36.00 MM
- MODEL:
- TENSILITE®
- STEM DIAMETER IMPERIAL:
- 0.2155'
$109.33 -
JE PISTONS Piston Kit 291517
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in competition or extreme performance applications, piston failure isn't an option. The JE PISTONS Piston Kit 291517 delivers the strength, precision, and weight optimization demanded by professional...09105905- SKU:
- 09105905
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 76.80 MM
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON HEAD SHAPE:
- DOMED
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- FORGED SIDE RELIEF DESIGN
- BORE - OVERSIZE:
- STANDARD
- STYLE:
- PRO SERIES
$309.99Qty in Cart: 0Quantity:Price:$309.99Subtotal: -
JE PISTONS Piston Kit 292330
JE PISTONS
$269.99When you're pushing your engine to the limit in professional competition, your pistons need to survive extreme pressures and temperatures without compromise. JE Pistons' 2618-T6 forged aluminum construction delivers the strength and reliability required...09105906- SKU:
- 09105906
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- 9.0:1
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- BORE - OVERSIZE METRIC:
- +1.00 MM
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- BORE SIZE METRIC:
- 101.00 MM
- DISPLACEMENT:
- 650 CC
- RIDING STYLE:
- OFF-ROAD
$269.99 -
JE PISTONS Piston Kit 299245
JE PISTONS
$309.99When you're pushing your engine to the absolute limit in competition, your pistons need to handle extreme pressures and temperatures without compromise. JE Pistons' Pro Series 299245 kit delivers the precision engineering and durability required for...09105908- SKU:
- 09105908
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 249 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- PRO SERIES
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.2:1
- PISTON HEAD SHAPE:
- DOMED
- TYPE:
- FORGED SIDE RELIEF DESIGN
$309.99 -
JE PISTONS Piston Kit 300275
JE PISTONS
$269.99When you're pushing your engine to the absolute limit in competition, your pistons need to survive extreme combustion pressures and thermal cycling without compromise. JE PISTONS' 300275 kit delivers the precision engineering and materials science...09105912- SKU:
- 09105912
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 644 CC
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 100.00 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON HEAD SHAPE:
- FLAT TOP
- STYLE:
- JE PISTON
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
$269.99 -
JE PISTONS Piston Kit 300276
JE PISTONS
$283.99When you're pushing your engine to the absolute limit—whether on the strip, road course, or in a competition setting—your pistons need to handle extreme pressures and temperatures without compromise. JE PISTONS' Pro Series 300276 kit delivers the...09105913- SKU:
- 09105913
- Availability:
- Ships Same Business Day
- Weight:
- 1.36 LBS
- DISPLACEMENT:
- 650 CC
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 101.00 MM
- TYPE:
- ROUND FORGED DESIGN
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON HEAD SHAPE:
- FLAT TOP
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- JE PISTON
- BORE - OVERSIZE:
- +1,00 MM
- PRODUCT NAME:
- PISTON KIT
$283.99 -
Cylinder Works Standard Bore Gasket Kit for Honda CRF450R 2017-2019 810989
CYLINDER WORKS
$79.22A complete engine rebuild demands gasket integrity—any compromise in sealing leads to oil weeping, coolant loss, and performance degradation. The Cylinder Works Standard Bore Gasket Kit delivers precision-engineered sealing surfaces and factory-grade...09346003- SKU:
- 09346003
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- STANDARD
- PRODUCT NAME:
- GASKET KIT
$79.22 -
Cylinder Works Big Bore Gasket Kit for Honda CRF250R 2018-2019 CW11011G01
CYLINDER WORKS
$66.95When you're running a big bore kit on your Honda CRF250R, your factory gasket set isn't engineered for the increased displacement, compression, and heat cycling—compromised sealing leads to oil weeps, air leaks, and lost performance gains. The Cylinder...09346344- SKU:
- 09346344
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CYLINDER BASE
- UNITS:
- KIT
- BORE SIZE IMPERIAL:
- OVERSIZE (+3.00 MM)
- TYPE:
- CYLINDER HEAD
$66.95Qty in Cart: 0Quantity:Price:$66.95Subtotal: -
Cylinder Works Standard Bore Cylinder Yamaha YZ250F 2014-2018 20010
CYLINDER WORKS
$434.95A worn or damaged cylinder compromises combustion efficiency and power delivery on your YZ250F. The Cylinder Works Standard Bore Cylinder restores your bike to peak performance with a ready-to-install replacement that eliminates downtime and re-plating...09310579- SKU:
- 09310579
- Availability:
- Ships Same Business Day
- Weight:
- 2.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER:
- 77,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER
- CYLINDER DIAMETER METRIC:
- 77.00 MM
- OVERBORE METRIC:
- STANDARD
- STYLE:
- STANDARD
$434.95 -
Cylinder Works Big Bore Cylinder Kit for 2015-2023 Kawasaki KVF750 Brute Force 4x4i 860cc 31007-K02
CYLINDER WORKS
$609.95If you're running a KVF750 Brute Force and want measurable power gains without extensive machine work, this big bore kit delivers. The matched Vertex pistons and nickel silicon carbide cylinder plating ensure reliability under sustained high-load...09310583- SKU:
- 09310583
- Availability:
- Ships Same Business Day
- Weight:
- 3.55 LBS
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- CYLINDER DIAMETER:
- 76,80 MM
- STYLE:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 76.80 MM
- RIDING STYLE:
- OFF-ROAD
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER KIT
- UNITS:
- KIT
$609.95 -
Cylinder Works Standard Bore Cylinder Kit Yamaha YZ450F 2014-2017 20005-K02
CYLINDER WORKS
$804.95The stock cylinder on your YZ450F experiences wear that directly impacts power delivery and throttle response. This Cylinder Works kit restores—or exceeds—OEM performance with fresh Nickel Silicon Carbide plating and matched Vertex pistons, all without...09310585- SKU:
- 09310585
- Availability:
- Ships Same Business Day
- Weight:
- 4.55 LBS
- CYLINDER DIAMETER:
- 97,00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$804.95 -
Cylinder Works YZ 250 1999-2024 Standard Bore Cylinder Kit 20009-K01
CYLINDER WORKS
$842.95When your YZ 250's cylinder shows signs of wear—scoring, reduced compression, or lost power—a full rebuild with quality components is the most cost-effective path back to peak performance. The Cylinder Works Standard Bore Kit delivers everything you need...09310587- SKU:
- 09310587
- Availability:
- Ships Same Business Day
- Weight:
- 7.35 LBS
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$842.95 -
Cylinder Works YZ125 2005-2021 Cylinder Head CH2005-K01
CYLINDER WORKS
$145.95If you're running a YZ125 and looking to unlock real performance gains, a quality cylinder head upgrade is one of the most direct ways to improve combustion efficiency and airflow. The Cylinder Works CH2005-K01 is engineered with a competition valve job...09300205- SKU:
- 09300205
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- CYLINDER HEAD
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$145.95 -
Cylinder Works High Compression Cylinder Kit for Honda CRF250R 2008-2009 10001-K02HC
CYLINDER WORKS
$645.95When your Honda CRF250R is ready for more power, a high-compression cylinder kit is one of the most effective bolt-on upgrades available. This Cylinder Works kit delivers measurable gains in peak power and mid-range torque without requiring custom...09310290- SKU:
- 09310290
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- CYLINDER DIAMETER:
- 78,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- HIGH COMPRESSION
$645.95
