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 - Honda EX690064AM
COMETIC
MSRP: $4.95Now: $4.46Was: $4.95Exhaust gasket failure leads to power loss, heat damage, and costly engine complications. The COMETIC EX690064AM delivers reliable, high-temperature sealing that won't fail under extreme conditions...09344546- SKU:
- 09344546
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BORE SIZE METRIC:
- 39.00 MM
- RIDING STYLE:
- ATV
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- THICKNESS METRIC:
- 1.63 MM
- TYPE:
- EXHAUST
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- THICKNESS IMPERIAL:
- 0,064'
MSRP: $4.95Now: $4.46Was: $4.95 -
On Sale
COMETIC Exhaust Gasket EX817
COMETIC
MSRP: $13.95Now: $12.56Was: $13.95Exhaust gasket failure means boost leaks, power loss, and costly engine damage—especially under high heat and pressure. The COMETIC EX817 is engineered for extreme conditions with a dual-layer...09344554- SKU:
- 09344554
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- TYPE:
- EXHAUST
- UNITS:
- SET
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- BORE SIZE METRIC:
- 90.00 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
MSRP: $13.95Now: $12.56Was: $13.95 -
On Sale
COMETIC Valve Cover Gasket - Honda VC032010S
COMETIC
MSRP: $39.95Now: $35.96Was: $39.95A failing valve cover gasket will bleed oil onto your engine bay and compromise your engine's cleanliness—exactly what you don't want during a race or on the street. The COMETIC VC032010S delivers...09344566- SKU:
- 09344566
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE COVER
- MODEL:
- HI-PERFORMANCE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
MSRP: $39.95Now: $35.96Was: $39.95 -
On Sale
COMETIC Bottom End Gasket Set - Gas Gas C3310
COMETIC
MSRP: $64.95Now: $58.46Was: $64.95A complete bottom end gasket set is essential when you're doing a full engine rebuild—it ensures all sealing surfaces are fresh and properly engineered for your Gas Gas C3310, eliminating the risk of...09344140- SKU:
- 09344140
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
MSRP: $64.95Now: $58.46Was: $64.95Qty in Cart: 0Quantity:Price:MSRP: $64.95Now: $58.46Was: $64.95Subtotal: -
On Sale
COMETIC Stator Gasket - Kawasaki EC1339032AFM
COMETIC
MSRP: $16.95Now: $15.26Was: $16.95Stator cover gasket failures are costly downtime culprits—they weep, crawl, and demand tedious scraping during replacement. The COMETIC Stator Gasket eliminates these headaches with its AFM composite...09344392- SKU:
- 09344392
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MODEL:
- HI-PERFORMANCE
- PRODUCT NAME:
- GASKET
- TYPE:
- STATOR COVER
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- UNITS:
- EACH
MSRP: $16.95Now: $15.26Was: $16.95Qty in Cart: 0Quantity:Price:MSRP: $16.95Now: $15.26Was: $16.95Subtotal: -
Hot Cams Valve Shim 10.0 x 2.25 for 2008-2010 KTM 530 EXC-R 5PK1000225
HOT CAMS
$12.55Valve shim wear directly impacts your KTM 530 EXC-R's compression, valve timing, and overall engine responsiveness. This five-piece Hot Cams replacement pack gives you the precision shims needed to...09261282- SKU:
- 09261282
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 2.25 MM
$12.55 -
Hot Cams Valve Shim 10.0 x 2.30 for 2008-2010 KTM 530 EXC-R 5PK1000230
HOT CAMS
$11.95Valve shim clearance directly impacts your 530 EXC-R's fuel efficiency, power delivery, and engine longevity. Worn or damaged shims throw off valve timing and increase the risk of bent valves—a...09261283- SKU:
- 09261283
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- PRODUCT NAME:
- SHIM
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.30 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Hot Cams Valve Shim Kit 7.48mm OD 1.20-3.50mm Honda CRF150R 2007-2022 HCSHIM01
HOT CAMS
$11.50Maintaining precise valve clearance is critical to keeping your CRF150R running at peak efficiency—and worn or mismatched shims will compromise both power delivery and engine longevity. The Hot Cams...09261302- SKU:
- 09261302
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- TYPE:
- VALVE
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.20 MM
$11.50 -
Hot Cams Stage 1 Intake Camshaft for Yamaha YZ250F 2001-2013 4012-1IN
HOT CAMS
$335.95If you're running a YZ250F and want measurable gains in low-end torque and throttle response, the Hot Cams Stage 1 Intake Camshaft is a bolt-on upgrade that delivers without requiring valve spring...YZ250S1AI- SKU:
- YZ250S1AI
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- INTAKE DURATION IMPERIAL:
- 249°
- INTAKE LIFT METRIC:
- 8.48 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAMSHAFT
$335.95 -
Hot Cams Stage 1 Intake Camshaft for Yamaha WR 400 F 1998-2000 4002-1IN
HOT CAMS
$294.95If you're running a WR 400 F and want genuine low-end grunt without compromising reliability, the Hot Cams Stage 1 intake camshaft is the straightforward upgrade that delivers. This is a bolt-on cam...YZ426S1AI- SKU:
- YZ426S1AI
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- CAMSHAFT
- INTAKE LIFT METRIC:
- 8.80 MM
- INTAKE DURATION IMPERIAL:
- 260°
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$294.95 -
Hot Cams Stage 1 Camshaft for Honda XR650R 2000-2007 1009-1
HOT CAMS
$391.95If you're running an XR650R and want noticeable gains in low-end torque without breaking compatibility with your stock valve springs, the Hot Cams Stage 1 delivers exactly that—a bolt-on power...XR650S1A- SKU:
- XR650S1A
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- INTAKE DURATION IMPERIAL:
- 254°
- EXHAUST DURATION IMPERIAL:
- 251°
- INTAKE LIFT METRIC:
- 9.26 MM
- TYPE:
- STAGE 1
- APPLICATION:
- EXHAUST
- EXHAUST LIFT METRIC:
- 9.20 MM
- PRODUCT NAME:
- CAMSHAFT
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$391.95Qty in Cart: 0Quantity:Price:$391.95Subtotal: -
Hot Cams Stage 2 Camshaft for 2000-2007 Honda XR650R 1010-2
HOT CAMS
$411.55If you're running a 2000-2007 Honda XR650R and want measurable gains in peak horsepower and throttle response, the Hot Cams Stage 2 Camshaft is the most direct path to real performance. This is a...XR650S2A- SKU:
- XR650S2A
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- APPLICATION:
- INTAKE
- EXHAUST LIFT METRIC:
- 9.50 MM
- INTAKE LIFT METRIC:
- 9.57 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INTAKE DURATION IMPERIAL:
- 265°
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- EXHAUST DURATION IMPERIAL:
- 260°
$411.55 -
Hot Cams Exhaust Camshaft for Suzuki RM-Z450 2015-2017 2321-1E
HOT CAMS
$289.95If you're serious about extracting maximum performance from your RM-Z450, a quality exhaust camshaft is essential—it directly controls valve timing and lift, which determines how efficiently your...09251195- SKU:
- 09251195
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 248.35°
- RIDING STYLE:
- OFF-ROAD
- EXHAUST LIFT METRIC:
- 9.70 MM
- TYPE:
- STAGE 1
- PRODUCT NAME:
- CAMSHAFT
$289.95 -
Hot Cams Stage 2 Intake Camshaft for Yamaha YZ250F 2017-2018 4326-2IN
HOT CAMS
$289.95If you're running a YZ250F in competitive racing or high-demand trail conditions, your stock camshaft is leaving power on the table. The Hot Cams Stage 2 Intake Camshaft delivers measurable gains...09251199- SKU:
- 09251199
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- INTAKE LIFT METRIC:
- 9.91 MM
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- INTAKE DURATION IMPERIAL:
- 256.89°
- RIDING STYLE:
- OFF-ROAD
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Hot Cams Exhaust Camshaft for Yamaha YZ250F 2017-2018 4327-2E
HOT CAMS
$289.95If you're serious about extracting maximum performance from your YZ250F, cam selection directly impacts how your engine delivers power across the entire RPM band. The HOT CAMS Exhaust Camshaft...09251200- SKU:
- 09251200
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- EXHAUST LIFT METRIC:
- 9.02 MM
- UNITS:
- EACH
- EXHAUST DURATION IMPERIAL:
- 252.83°
- RIDING STYLE:
- OFF-ROAD
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Hot Cams Camshaft for Honda CRF 450 R 2010-2016 1259-1
HOT CAMS
$448.95Stock camshaft profiles limit your CRF 450 R's potential, leaving horsepower and throttle response on the table. The HOT CAMS 1259-1 delivers measurable gains across the powerband while maintaining...09250843- SKU:
- 09250843
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- INTAKE DURATION IMPERIAL:
- 236°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- EXHAUST LIFT METRIC:
- 8.57 MM
- INTAKE LIFT METRIC:
- 9.58 MM
- TYPE:
- STAGE 1
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 270°
$448.95Qty in Cart: 0Quantity:Price:$448.95Subtotal: -
Hot Cams Stage 2 Camshaft for 2010-2016 Honda CRF450R 1260-2
HOT CAMS
$471.40If you're running a stock CRF450R cam, you're leaving power on the table—especially in the mid-range and top-end where races are won. The Hot Cams Stage 2 addresses this directly with a tuned valve...09250844- SKU:
- 09250844
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- CAMSHAFT
- TYPE:
- STAGE 2
- EXHAUST LIFT METRIC:
- 9.04 MM
- EXHAUST DURATION IMPERIAL:
- 265°
- INTAKE DURATION IMPERIAL:
- 254°
- INTAKE LIFT METRIC:
- 10.38 MM
$471.40Qty in Cart: 0Quantity:Price:$471.40Subtotal: -
Hot Cams Cam Chain 2004-2016 Kawasaki KX250F HC92RH2010114
HOT CAMS
$54.95A cam chain failure can leave your KX250F sidelined at the track or trail. The HOT CAMS HC92RH2010114 replaces the weak link with a heat-treated silent chain engineered to exceed OEM durability...09250845- SKU:
- 09250845
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BASE FINISH:
- RAW
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- STEEL
- MODEL:
- SILENT
- RIDING STYLE:
- OFF-ROAD
- CHAIN SIZE:
- 92RH2010
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
$54.95 -
Hot Cams Stage 2 Camshaft for Honda CRF250R 2010-2015 1265-2
HOT CAMS
$461.05If you're running a CRF250R in competition, your camshaft directly controls how your engine breathes—and stock cams leave significant power on the table. The HOT CAMS Stage 2 delivers measurable...09250846- SKU:
- 09250846
- Availability:
- Ships Same Business Day
- Weight:
- 1.21 LBS
- EXHAUST DURATION IMPERIAL:
- 266°
- INTAKE LIFT METRIC:
- 9.14 MM
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- INTAKE DURATION IMPERIAL:
- 255°
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST LIFT METRIC:
- 8.84 MM
- TYPE:
- STAGE 2
$461.05Qty in Cart: 0Quantity:Price:$461.05Subtotal: -
Hot Cams Stage 2 Intake Camshaft for Suzuki DR-Z400E 2000-2008 2251-2IN
HOT CAMS
$304.45The stock camshaft in your DR-Z400E limits what your engine can truly deliver. The Hot Cams Stage 2 intake camshaft unlocks significant gains in peak horsepower and mid-to-top-end power, giving you...09250693- SKU:
- 09250693
- Availability:
- Ships Same Business Day
- Weight:
- 0.97 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INTAKE LIFT METRIC:
- 9.07 MM
- PRODUCT NAME:
- CAMSHAFT
- INTAKE DURATION IMPERIAL:
- 238.5°
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$304.45
