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
-
On Sale
COMETIC Exhaust Gasket - Kawasaki C3501EX
COMETIC
MSRP: $15.95Now: $15.00Was: $15.95Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09344187- SKU:
- 09344187
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- SET
- BORE SIZE METRIC:
- 48.50 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
MSRP: $15.95Now: $15.00Was: $15.95Qty in Cart: 0Quantity:Price:MSRP: $15.95Now: $15.00Was: $15.95Subtotal: -
COMETIC Clutch Gasket - Honda EC1074018AFM
COMETIC
$5.00Clutch cover gaskets are made form an AFM Material which is a chemically blown, compounded nitrile synthetic rubber bonded to an aluminum core, Aluminum core gives the gasket strength for a superior seal and prevents the gasket from weeping or crawling...09344369- SKU:
- 09344369
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$5.00Qty in Cart: 0Quantity:Price:$5.00Subtotal: -
On Sale
COMETIC Stator Gasket - Yamaha EC471020F
COMETIC
MSRP: $9.95Now: $9.00Was: $9.95Stator cover gaskets are made from an AFM Material which is a chemically blown, compounded nitrile synthetic rubber bonded to an aluminum core, Save service time as AFM will not stick to the engine case making replacement quick and easy, no more...09344463- SKU:
- 09344463
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
- MODEL:
- HI-PERFORMANCE
- TYPE:
- STATOR COVER
- PRODUCT NAME:
- GASKET
MSRP: $9.95Now: $9.00Was: $9.95 -
On Sale
COMETIC Stator Gasket - KTM EC494032AFM
COMETIC
MSRP: $21.95Now: $21.00Was: $21.95Stator cover gaskets are made from an AFM Material which is a chemically blown, compounded nitrile synthetic rubber bonded to an aluminum core, Save service time as AFM will not stick to the engine case making replacement quick and easy, no more...09344465- SKU:
- 09344465
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,032'
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ATV
- THICKNESS:
- 0,81 MM (0,032')
- THICKNESS METRIC:
- 0.81 MM
- UNITS:
- EACH
MSRP: $21.95Now: $21.00Was: $21.95Qty in Cart: 0Quantity:Price:MSRP: $21.95Now: $21.00Was: $21.95Subtotal: -
On Sale
COMETIC Clutch Gasket - KTM EC496032AFM
COMETIC
MSRP: $21.95Now: $21.00Was: $21.95Clutch cover gaskets are made form an AFM Material which is a chemically blown, compounded nitrile synthetic rubber bonded to an aluminum core, Aluminum core gives the gasket strength for a superior seal and prevents the gasket from weeping or crawling...09344466- SKU:
- 09344466
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- MODEL:
- HI-PERFORMANCE
- THICKNESS IMPERIAL:
- 0,032'
MSRP: $21.95Now: $21.00Was: $21.95 -
On Sale
COMETIC Exhaust Gasket EX006042AM
COMETIC
MSRP: $7.95Now: $7.00Was: $7.95Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09344513- SKU:
- 09344513
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- BORE SIZE METRIC:
- 58.00 MM
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
MSRP: $7.95Now: $7.00Was: $7.95Qty in Cart: 0Quantity:Price:MSRP: $7.95Now: $7.00Was: $7.95Subtotal: -
On Sale
COMETIC Exhaust Gasket EX008042AM
COMETIC
MSRP: $7.95Now: $7.00Was: $7.95Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09344515- SKU:
- 09344515
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 68.00 MM
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
MSRP: $7.95Now: $7.00Was: $7.95Qty in Cart: 0Quantity:Price:MSRP: $7.95Now: $7.00Was: $7.95Subtotal: -
On Sale
COMETIC Exhaust Gasket EX651
COMETIC
MSRP: $11.95Now: $11.00Was: $11.95Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09344544- SKU:
- 09344544
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
MSRP: $11.95Now: $11.00Was: $11.95 -
COMETIC Exhaust Gasket - Kawasaki EX693064AM
COMETIC
$5.00Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09344549- SKU:
- 09344549
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- THICKNESS IMPERIAL:
- 0,064'
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.63 MM
- BORE SIZE IMPERIAL:
- 3.858'
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
$5.00Qty in Cart: 0Quantity:Price:$5.00Subtotal: -
On Sale
COMETIC Exhaust Gasket - Suzuki EX877
COMETIC
MSRP: $8.95Now: $8.00Was: $8.95Gasket material and construction will vary by application to ensure longevity with leak free performance under all conditions, 4-stroke applications utilize a double-sided Viton® rubber-coated stainless steel gasket providing precise, high-temperature...09344556- SKU:
- 09344556
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 101.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
MSRP: $8.95Now: $8.00Was: $8.95Qty in Cart: 0Quantity:Price:MSRP: $8.95Now: $8.00Was: $8.95Subtotal: -
On Sale
COMETIC Bottom End Gasket Set - Honda C3047BE
COMETIC
MSRP: $114.95Now: $108.00Was: $114.95Bottom end gasket kits include correct oil seals, O-rings, drain plug washers and water pump cover gaskets as needed, Materials will vary depending on what is correct and engineered for specified application, Purchase a top and a bottom end gasket kit...09344079- SKU:
- 09344079
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- BORE SIZE METRIC:
- 99.00 MM
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
MSRP: $114.95Now: $108.00Was: $114.95Qty in Cart: 0Quantity:Price:MSRP: $114.95Now: $108.00Was: $114.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.80 for 2008-2010 KTM 530 EXC-R 5PK1000280
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed for precision and durability. This set includes five high-quality shims, perfect for refilling your Valve Shim Kits and ensuring optimal valve clearance. Ideal for both...09261293- SKU:
- 09261293
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.80 MM
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
Hot Cams Stage 1 Camshaft for KTM 525 EXC 2003-2006 3015-1
HOT CAMS
$289.95Elevate your racing performance with the HOT CAMS Camshaft 3015-1, engineered for enthusiasts seeking an edge on the track. This high-performance camshaft is available in Stage 1 and Stage 2 options, ensuring optimal torque and horsepower tailored to...KTM520S1A- SKU:
- KTM520S1A
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 1
- APPLICATION:
- INTAKE
- EXHAUST DURATION IMPERIAL:
- 261°
- INTAKE LIFT METRIC:
- 10.80 MM
- EXHAUST LIFT METRIC:
- 10.20 MM
- INTAKE DURATION IMPERIAL:
- 271°
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
On Sale
Hot Cams Exhaust Camshaft for Suzuki RM-Z450 2015-2017 2323-2E
HOT CAMS
MSRP: $263.95Now: $169.00Was: $263.95Unlock the full potential of your engine with the HOT CAMS Exhaust Camshaft 2323-2E, designed for high-performance racing applications. This camshaft enhances throttle response and power delivery, ensuring a thrilling driving experience from mid-range to...09251196- SKU:
- 09251196
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- EXHAUST LIFT METRIC:
- 9.04 MM
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 259.02°
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- RIDING STYLE:
- OFF-ROAD
MSRP: $263.95Now: $169.00Was: $263.95Qty in Cart: 0Quantity:Price:MSRP: $263.95Now: $169.00Was: $263.95Subtotal: -
Hot Cams Stage 1 Intake Camshaft for 2017-2018 Yamaha YZ250F 4324-1IN
HOT CAMS
$289.95Experience unmatched performance with the HOT CAMS Camshaft 4324-1IN, engineered for high-performance racing. Designed for easy drop-in installation, these camshafts optimize torque and horsepower, enhancing your engine's capabilities across the entire...09251197- SKU:
- 09251197
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- INTAKE LIFT METRIC:
- 9.47 MM
- TYPE:
- STAGE 1
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- INTAKE DURATION IMPERIAL:
- 248.44°
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
On Sale
Hot Cams Stage 2 Intake Camshaft for Kawasaki KLX450R 2008-2012 2198-2IN
HOT CAMS
MSRP: $240.95Now: $154.00Was: $240.95Experience unparalleled performance with the HOT CAMS 2198-2IN camshaft, designed specifically for high-performance racing applications. This camshaft offers a perfect blend of enhanced torque and horsepower, making it an ideal choice for enthusiasts...09250565- SKU:
- 09250565
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- INTAKE LIFT METRIC:
- 9.91 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- UNITS:
- EACH
- INTAKE DURATION IMPERIAL:
- 250°
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
MSRP: $240.95Now: $154.00Was: $240.95Qty in Cart: 0Quantity:Price:MSRP: $240.95Now: $154.00Was: $240.95Subtotal: -
Hot Cams Stage 2 Intake Camshaft for Yamaha YZ450F 2010-2013 4165-2IN
HOT CAMS
$321.95Experience unparalleled performance with the HOT CAMS Camshaft 4165-2IN, engineered for high-performance racing applications. These camshafts are designed for easy installation with stock valve springs, ensuring a seamless upgrade to your engine’s...09250569- SKU:
- 09250569
- Availability:
- Ships Same Business Day
- Weight:
- 0.99 LBS
- INTAKE LIFT METRIC:
- 9.78 MM
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- INTAKE DURATION IMPERIAL:
- 265°
- UNITS:
- EACH
$321.95Qty in Cart: 0Quantity:Price:$321.95Subtotal: -
Hot Cams Stage 2 Camshaft Honda CRF 450 R 2008 1102-2
HOT CAMS
$415.95Elevate your racing performance with the HOT CAMS Camshaft 1102-2, engineered for enthusiasts seeking a competitive edge. With options for both Stage 1 and Stage 2, these camshafts are designed for seamless integration with stock valve springs,...09250267- SKU:
- 09250267
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- EXHAUST DURATION IMPERIAL:
- 270°
- INTAKE DURATION IMPERIAL:
- 248°
- APPLICATION:
- EXHAUST
- INTAKE LIFT METRIC:
- 10.10 MM
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- EXHAUST LIFT METRIC:
- 8.80 MM
$415.95Qty in Cart: 0Quantity:Price:$415.95Subtotal: -
Hot Cams Stage 2 Exhaust Camshaft for Yamaha YZ450F 2003-2009 4090-2E
HOT CAMS
$310.95Unlock the full potential of your engine with the HOT CAMS Exhaust Camshaft 4090-2E. Designed for high-performance racing, this camshaft enhances both torque and horsepower, tailored to your specific needs. Experience improved throttle response and power...09250277- SKU:
- 09250277
- Availability:
- Ships Same Business Day
- Weight:
- 0.98 LBS
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- EXHAUST LIFT METRIC:
- 8.70 MM
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 254°
- TYPE:
- STAGE 2
$310.95Qty in Cart: 0Quantity:Price:$310.95Subtotal: -
Hot Cams Exhaust Valve Steel Honda CRF450R 2013-2020 8400027-5
HOT CAMS
$54.95Upgrade your engine's performance with the HOT CAMS Exhaust Valve 8400027-5, designed for precision and durability. This forged one-piece valve ensures a perfect fit as an OEM replacement, enhancing your engine's efficiency and longevity. With advanced...09262913- SKU:
- 09262913
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- COLOR/FINISH:
- BLACK
- STEM DIAMETER METRIC:
- 4.980 MM
- APPLICATION:
- EXHAUST
- BASE COLOR:
- BLACK
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$54.95
