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 RODS Seal Output Shaft OSK0051
HOT RODS
$26.95A leaking countershaft seal can quickly turn a minor annoyance into catastrophic engine damage. This complete HOT RODS seal kit gives you everything needed to stop the leak at its source—countershaft...09350566- SKU:
- 09350566
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$26.95 -
HOT RODS Seal Output Shaft OSK0053
HOT RODS
$35.95A leaking countershaft seal compromises transmission efficiency and risks catastrophic internal damage if left unaddressed. This complete HOT RODS repair kit delivers everything needed for a thorough...09350568- SKU:
- 09350568
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- COUNTERSHAFT
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- TRANSMISSION
$35.95Qty in Cart: 0Quantity:Price:$35.95Subtotal: -
HOT RODS Seal Output Shaft OSK0002
HOT RODS
$37.95A leaking countershaft seal doesn't just waste oil—it compromises engine reliability and can lead to costly damage if left unaddressed. The HOT RODS Seal Output Shaft kit (OSK0002) gives you...09350569- SKU:
- 09350569
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SEAL
- UNITS:
- KIT
$37.95Qty in Cart: 0Quantity:Price:$37.95Subtotal: -
HOT RODS Seal Output Shaft OSK0004
HOT RODS
$31.95A leaking countershaft seal is more than an inconvenience—it's a warning sign that debris and contamination are entering your transmission. The HOT RODS Seal Output Shaft kit gives you everything...09350571- SKU:
- 09350571
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- SEAL
$31.95 -
HOT RODS Seal Output Shaft OSK0006
HOT RODS
$13.95A leaking countershaft seal will rob your engine of oil pressure and invite catastrophic bearing failure—this complete kit eliminates the guesswork and gets you back to racing. HOT RODS engineered...09350572- SKU:
- 09350572
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- COUNTERSHAFT
- APPLICATION:
- TRANSMISSION
- PRODUCT NAME:
- SEAL
$13.95 -
HOT RODS Connecting Rod 8725
HOT RODS
$159.55When you're pushing your engine to the limit, your connecting rods are absorbing extreme loads cycle after cycle. The HOT RODS 8725 delivers the strength and precision engineering needed to handle...09230516- SKU:
- 09230516
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
$159.55 -
HOT RODS Crank Bearings K072
HOT RODS
$89.95A crankshaft is only as reliable as its bearings. The HOT RODS K072 crank bearing and seal kit ensures proper load distribution, reduced friction, and extended engine longevity—critical when you're...09240247- SKU:
- 09240247
- Availability:
- Ships Same Business Day
- Weight:
- 1.51 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- BALL
$89.95 -
HOT RODS Crankshaft Kit CBK0001
HOT RODS
$321.25If you're building a high-performance engine or rebuilding a worn crankshaft assembly, the HOT RODS Crankshaft Kit CBK0001 delivers factory-spec reliability with measurable performance gains over OEM...09210260- SKU:
- 09210260
- Availability:
- Ships Same Business Day
- Weight:
- 7.10 LBS
- TYPE:
- OEM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$321.25 -
HOT RODS Crankshaft Kit CBK0004
HOT RODS
$741.95If you're building a high-performance engine or restoring a classic with increased displacement, the HOT RODS Crankshaft Kit CBK0004 delivers the stroke length and structural integrity needed for...09210263- SKU:
- 09210263
- Availability:
- Ships Same Business Day
- Weight:
- 9.47 LBS
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- UNITS:
- KIT
$741.95Qty in Cart: 0Quantity:Price:$741.95Subtotal: -
HOT RODS Crankshaft Kit CBK0006
HOT RODS
$795.95The HOT RODS Crankshaft Kit CBK0006 delivers factory-matched reliability with performance that meets or exceeds OEM specifications, making it ideal for both stock rebuilds and performance...09210265- SKU:
- 09210265
- Availability:
- Ships Same Business Day
- Weight:
- 12.35 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$795.95Qty in Cart: 0Quantity:Price:$795.95Subtotal: -
On Sale
COMETIC Exhaust Gasket - Honda C7126EX
COMETIC
MSRP: $11.95Now: $10.76Was: $11.95Exhaust gasket failure means catastrophic air leaks, lost power, and potential engine damage—and you can't trust a subpar seal at high temperatures or high boost. The COMETIC C7126EX is engineered to...09344236- SKU:
- 09344236
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 51.00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- MODEL:
- HI-PERFORMANCE
- TYPE:
- EXHAUST
- UNITS:
- SET
MSRP: $11.95Now: $10.76Was: $11.95 -
On Sale
COMETIC Bottom End Gasket Set - Honda C7191BE
COMETIC
MSRP: $82.95Now: $74.66Was: $82.95A complete bottom end gasket set is essential when you're rebuilding your engine—skimping on gasket quality invites oil leaks, coolant seepage, and catastrophic internal failures down the line...09344252- SKU:
- 09344252
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BORE SIZE METRIC:
- 68.50 MM
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- BORE SIZE METRIC:
- 66.50 MM
- MODEL:
- HI-PERFORMANCE
- UNITS:
- KIT
MSRP: $82.95Now: $74.66Was: $82.95 -
On Sale
COMETIC Stator Gasket - Suzuki EC1019032AFM
COMETIC
MSRP: $13.95Now: $12.56Was: $13.95Stator cover gaskets are a wear item that directly impact engine reliability and maintenance efficiency. The COMETIC EC1019032AFM eliminates the frustration of stuck gaskets and failed seals with its...09344363- SKU:
- 09344363
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STATOR COVER
- MODEL:
- HI-PERFORMANCE
- MATERIAL:
- AFM (ALUMINUM FOAM MATERIAL)
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
MSRP: $13.95Now: $12.56Was: $13.95 -
Hot Cams Stage 1 Intake Camshaft for 2014-2015 Yamaha YZ450F 4278-1IN
HOT CAMS
$289.95The stock camshaft in your 2014-2015 YZ450F limits mid-range response and peak power delivery. The Hot Cams Stage 1 Intake Camshaft unlocks measurable gains in torque and horsepower while maintaining...09250882- SKU:
- 09250882
- Availability:
- Ships Same Business Day
- Weight:
- 0.96 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- INTAKE DURATION IMPERIAL:
- 251.8°
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
- INTAKE LIFT METRIC:
- 9.73 MM
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Hot Cams Camshaft 4280-2IN
HOT CAMS
$289.95If you're serious about extracting maximum performance from your engine, cam selection is non-negotiable. The Hot Cams 4280-2IN delivers measurable gains in torque and horsepower across critical RPM...09250884- SKU:
- 09250884
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- INTAKE DURATION IMPERIAL:
- 269.3°
- UNITS:
- EACH
- INTAKE LIFT METRIC:
- 10.03 MM
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
Hot Cams Cam Chain for 1996-2017 Kawasaki KLR650 HC92RH2015174
HOT CAMS
$88.95Upgrade your engine's performance with the HOT CAMS Cam Chain HC92RH2015174. Designed for durability and precision, this silent chain features heat-treated links that enhance friction and impact...09250984- SKU:
- 09250984
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MODEL:
- SILENT
- PRODUCT NAME:
- CHAIN
- TYPE:
- CAM
- BASE FINISH:
- RAW
- COLOR/FINISH:
- RAW
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- CHAIN SIZE:
- 92RH2015
- MATERIAL:
- STEEL
$88.95Qty in Cart: 0Quantity:Price:$88.95Subtotal: -
Hot Cams Valve Shim 10.0mm x 2.45mm for KTM 690 Enduro R 2009-2010 5PK1000245
HOT CAMS
$11.95Enhance your engine's performance with the HOT CAMS Valve Shim 10.0 x 2.45. This pack includes five high-quality shims, designed to ensure optimal valve clearance and precision adjustments for your...09261286- SKU:
- 09261286
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.45 MM
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- TYPE:
- VALVE
- MATERIAL:
- STEEL
$11.95Qty in Cart: 0Quantity:Price:$11.95Subtotal: -
Wiseco Piston Kit 48.5mm for 1979-1984 Honda XR80 PK1278
WISECO
$179.95When you're pushing your XR80 to its limits, the stock piston can't keep up. The Wiseco PK1278 piston kit delivers the strength and precision engineering needed to handle aggressive riding and racing...09030230- SKU:
- 09030230
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON DIAMETER METRIC:
- 48.47 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE SIZE METRIC:
- 48.50 MM
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 45.00 MM
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Honda XR200 1980-1983 Piston Kit with Gaskets PK1116
WISECO
$204.95A top-end rebuild demands precision components that can handle sustained high RPMs and extreme combustion temperatures. The Wiseco Honda XR200 Piston Kit delivers exactly that—high-silicone forged...09030231- SKU:
- 09030231
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE SIZE METRIC:
- 65.50 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 192 CC
- PISTON DIAMETER METRIC:
- 65.45 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Engine Rebuild Kit Suzuki RM250 2005-2010 PWR165B-100
WISECO
$664.95Your RM250's performance depends on a reliable bottom end. The Wiseco Engine Rebuild Kit PWR165B-100 delivers a complete top and bottom-end overhaul with factory-inspected components, eliminating the...09031545- SKU:
- 09031545
- Availability:
- Ships Same Business Day
- Weight:
- 13.95 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- GARAGE BUDDY
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 66.40 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- FEATURES:
- PROLITE® PISTON
- OVERBORE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$664.95Qty in Cart: 0Quantity:Price:$664.95Subtotal:
