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
-
BOYESEN Ignition Cover - Gold - KX125 SC-11AM
BOYESEN
$87.95BOYESEN Ignition Cover Gold KX125 SC-11AMLook like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum...09400214- SKU:
- 09400214
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- FACTORY RACING
- UNITS:
- EACH
- COLOR/FINISH:
- MAGNESIUM
$87.95 -
BOYESEN Ignition Cover - Gold - CR500 SC-03M
BOYESEN
$87.95BOYESEN Ignition Cover Gold CR500 SC-03MLook like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum...09400212- SKU:
- 09400212
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- COLOR/FINISH:
- MAGNESIUM
- MATERIAL:
- ALUMINUM
$87.95 -
BOYESEN Ignition Cover - Gold - CR250 SC02AM
BOYESEN
$87.95BOYESEN Ignition Cover Gold CR250 SC02AMLook like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum...09400211- SKU:
- 09400211
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- UNITS:
- EACH
- COLOR/FINISH:
- MAGNESIUM
- MATERIAL:
- ALUMINUM
$87.95 -
BOYESEN Ignition Cover - Gold - CR250 SC-02M
BOYESEN
$87.95BOYESEN Ignition Cover Gold CR250 SC-02MLook like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum...09400210- SKU:
- 09400210
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- COLOR/FINISH:
- MAGNESIUM
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- UNITS:
- EACH
$87.95Qty in Cart: 0Quantity:Price:$87.95Subtotal: -
BOYESEN Replacement Gasket - KTM CCG-41
BOYESEN
$7.00BOYESEN Replacement Gasket KTM CCG-41Set your ride apart from the rest with the ultimate look in race performance, Lightweight factory clutch covers provide years of outstanding protection; guaranteed not to warp, Individually surfaced for a perfect,...09343124- SKU:
- 09343124
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- NITRILE RUBBER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$7.00 -
BOYESEN Ignition Gasket Cover - KTM SCG-40A
BOYESEN
$5.95BOYESEN Ignition Gasket Cover KTM SCG-40ALook like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum...09343123- SKU:
- 09343123
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- TYPE:
- IGNITION COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- UNITS:
- EACH
$5.95 -
BOYESEN Replacement Gasket CCG-42
BOYESEN
$7.00BOYESEN Replacement Gasket CCG-42Set your ride apart from the rest with the ultimate look in race performance, Lightweight factory clutch covers provide years of outstanding protection; guaranteed not to warp, Individually surfaced for a perfect,...09341291- SKU:
- 09341291
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- MATERIAL:
- NITRILE RUBBER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$7.00 -
BOYESEN Replacement Gasket SCG-42
BOYESEN
$5.95BOYESEN Replacement Gasket SCG-42Look like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum and are...09341290- SKU:
- 09341290
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER GASKET
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.95 -
BOYESEN Ignition Cover Gasket SCG-41
BOYESEN
$5.95BOYESEN Ignition Cover Gasket SCG-41Look like a professional with the Factory Ignition Cover, Seals properly, guarding inside of engine from dirt and water and outlasts stock covers, Boyesen Factory Covers are cast from the highest grade of aluminum and...09341285- SKU:
- 09341285
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION COVER GASKET
- MATERIAL:
- NITRILE RUBBER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$5.95 -
BOYESEN Replacement Gasket - KTM CCG-46
BOYESEN
$7.00BOYESEN Replacement Gasket KTM CCG-46Set your ride apart from the rest with the ultimate look in race performance, Lightweight factory clutch covers provide years of outstanding protection; guaranteed not to warp, Individually surfaced for a perfect,...09341283- SKU:
- 09341283
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$7.00 -
BOYESEN Replacement Gasket CCG-27
BOYESEN
$7.00BOYESEN Replacement Gasket CCG-27Set your ride apart from the rest with the ultimate look in race performance, Lightweight factory clutch covers provide years of outstanding protection; guaranteed not to warp, Individually surfaced for a perfect,...09341272- SKU:
- 09341272
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- PRODUCT NAME:
- GASKET
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$7.00 -
BOYESEN Clutch Cover Gasket CCG-06X
BOYESEN
$7.00BOYESEN Clutch Cover Gasket CCG-06XSet your ride apart from the rest with the ultimate look in race performance, Lightweight factory clutch covers provide years of outstanding protection; guaranteed not to warp, Individually surfaced for a perfect,...09340959- SKU:
- 09340959
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- STREET
- TYPE:
- CLUTCH COVER
- MATERIAL:
- NITRILE RUBBER
- MODEL:
- FACTORY RACING
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$7.00 -
BOYESEN Impeller/Waterpump Cover - Magnesium WPK-18AM
BOYESEN
$194.95BOYESEN Impeller/Waterpump Cover Magnesium WPK-18AMAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been...09320163- SKU:
- 09320163
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MATERIAL:
- ALUMINUM
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPERCOOLER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- MAGNESIUM
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- UNITS:
- KIT
$194.95 -
BOYESEN Impeller/Waterpump Cover - Black WPK-18AB
BOYESEN
$194.95BOYESEN Impeller/Waterpump Cover Black WPK-18ABAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been tested...09320162- SKU:
- 09320162
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPERCOOLER
- TYPE:
- WATER PUMP
$194.95 -
BOYESEN Impeller/Waterpump Cover - Orange WPK-45AO
BOYESEN
$199.95BOYESEN Impeller/Waterpump Cover Orange WPK-45AOAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been tested...09320160- SKU:
- 09320160
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BASE COLOR:
- ORANGE
- UNITS:
- KIT
- BASE FINISH:
- POWDER-COATED
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- ORANGE
- MODEL:
- SUPERCOOLER
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- TYPE:
- WATER PUMP
$199.95 -
BOYESEN Impeller/Waterpump Cover - Magnesium WPK-45AM
BOYESEN
$194.95BOYESEN Impeller/Waterpump Cover Magnesium WPK-45AMAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been...09320159- SKU:
- 09320159
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- COLOR/FINISH:
- MAGNESIUM
- UNITS:
- KIT
- BASE FINISH:
- POWDER-COATED
- MODEL:
- SUPERCOOLER
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- TYPE:
- WATER PUMP
$194.95 -
BOYESEN Impeller/Waterpump Cover - Black WPK-45AB
BOYESEN
$194.95BOYESEN Impeller/Waterpump Cover Black WPK-45ABAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been tested...09320158- SKU:
- 09320158
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
- BASE COLOR:
- BLACK
- TYPE:
- WATER PUMP
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPERCOOLER
- RIDING STYLE:
- OFF-ROAD
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- UNITS:
- KIT
$194.95 -
BOYESEN Impeller/Waterpump Cover - Orange WPK-44AO
BOYESEN
$199.95BOYESEN Impeller/Waterpump Cover Orange WPK-44AOAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been tested...09320156- SKU:
- 09320156
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- POWDER-COATED
- TYPE:
- WATER PUMP
- COLOR/FINISH:
- ORANGE
- MODEL:
- SUPERCOOLER
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- BASE COLOR:
- ORANGE
- RIDING STYLE:
- OFF-ROAD
$199.95 -
BOYESEN Impeller/Waterpump Cover - Magnesium WPK-44AM
BOYESEN
$194.95BOYESEN Impeller/Waterpump Cover Magnesium WPK-44AMAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been...09320155- SKU:
- 09320155
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- MAGNESIUM
- TYPE:
- WATER PUMP
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- COLOR/FINISH:
- POWDER-COATED
- MODEL:
- SUPERCOOLER
$194.95 -
BOYESEN Impeller/Waterpump Cover - Black WPK-44AB
BOYESEN
$194.95BOYESEN Impeller/Waterpump Cover Black WPK-44ABAn aluminum investment-cast water pump cover and impeller combo; specifically designed to enhance the performance of your engines cooling system, This high-flow, hydrodynamic water pump kit has been tested...09320154- SKU:
- 09320154
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BASE FINISH:
- POWDER-COATED
- COLOR/FINISH:
- BLACK
- UNITS:
- KIT
- COLOR/FINISH:
- POWDER-COATED
- MATERIAL:
- ALUMINUM
- MODEL:
- SUPERCOOLER
- TYPE:
- WATER PUMP
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- COVER AND IMPELLER KIT
- RIDING STYLE:
- OFF-ROAD
$194.95
