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 Cams Valve Shim 7.48mm x 1.30mm for Honda CBR600RR 2003-2007 5PK748130
HOT CAMS
$10.95Enhance the performance of your engine with the HOT CAMS Valve Shim 7.48 x 1.30. This 5-pack of high-quality shims is designed to refill your Valve Shim Kits, ensuring optimal valve clearance and engine efficiency. Perfect for both professional mechanics...09261304- SKU:
- 09261304
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- VALVE SHIM THICKNESS METRIC:
- 1.30 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- UNITS:
- 5 PACK
- TYPE:
- VALVE
$10.95 -
Hot Cams Valve Shim 10.00mm x 2.55mm for KTM 530 EXC-R 2008-2010 5PK1000255
HOT CAMS
$10.95Enhance your engine's performance with the HOT CAMS Valve Shim pack, designed to provide precise adjustments for optimal valve clearance. Each shim is crafted for durability and accuracy, ensuring your engine runs smoothly and efficiently. Ideal for...09261288- SKU:
- 09261288
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.55 MM
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- 5 PACK
- PRODUCT NAME:
- SHIM
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
CV4 Valve Spring Shim Kit CVMS13000
CV4
$6.59Shim Kits for Valve Springs09261165- SKU:
- 09261165
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- SIZE IMPERIAL:
- OVERSIZE (+0.010')
- TYPE:
- VALVE SPRING
- UNITS:
- 4 PACK
- PRODUCT NAME:
- SHIM
$6.59Qty in Cart: 0Quantity:Price:$6.59Subtotal: -
XCELDYNE Valve Seal Kit CVMSEA43000
XCELDYNE
$19.44Made from premium Viton material and offers superior oil control, Exhibit the least amount of parasitic drag and wear on the valve, giving greater life of the valve and better power, Fit OE valve and valve guide dimensions for many applications09260661- SKU:
- 09260661
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- RIDING STYLE:
- ATV
- MATERIAL:
- VITON
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- PRODUCT NAME:
- SEAL KIT
- UNITS:
- KIT
$19.44Qty in Cart: 0Quantity:Price:$19.44Subtotal: -
XCELDYNE Valve Guide Kit - Exhaust CVGM12002
XCELDYNE
$36.63Highest tolerances for correct valve stem support and fitment in cylinder head, Built from Xceldyne's specified blend of Manganese-bronze, Heat dissipation (thermal conductivity) and valve stem lubrication are substantially increased, which leads to...09260602- SKU:
- 09260602
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- EXHAUST
- MATERIAL:
- MANGANESE-BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- 2 PIECE
- RIDING STYLE:
- OFF-ROAD
$36.63Qty in Cart: 0Quantity:Price:$36.63Subtotal: -
Hot Cams Exhaust Camshaft for Suzuki RM-Z250 2016-2020 2310-2E
HOT CAMS
$289.95Unlock the full potential of your engine with the HOT CAMS Exhaust Camshaft 2310-2E. Designed for high-performance racing applications, this camshaft enhances both torque and horsepower, ensuring optimal performance across various RPM ranges. Experience...09251192- SKU:
- 09251192
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- APPLICATION:
- EXHAUST
- TYPE:
- STAGE 2
- UNITS:
- EACH
- EXHAUST LIFT METRIC:
- 8.89 MM
- EXHAUST DURATION IMPERIAL:
- 244°
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CAMSHAFT
$289.95Qty in Cart: 0Quantity:Price:$289.95Subtotal: -
On Sale
Hot Cams Stage 2 Camshaft for 2016-2017 Honda CRF250R 1319-2
HOT CAMS
MSRP: $367.95Now: $235.00Was: $367.95Unlock the full potential of your engine with the HOT CAMS Camshaft 1319-2. Designed for high-performance racing, these camshafts are engineered for seamless installation with stock valve springs, ensuring a perfect fit for various applications...09251184- SKU:
- 09251184
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- EXHAUST DURATION IMPERIAL:
- 264.17°
- INTAKE DURATION IMPERIAL:
- 254.78°
- PRODUCT NAME:
- CAMSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STAGE 2
- APPLICATION:
- INTAKE
- EXHAUST LIFT METRIC:
- 9.40 MM
- INTAKE LIFT METRIC:
- 9.40 MM
MSRP: $367.95Now: $235.00Was: $367.95Qty in Cart: 0Quantity:Price:MSRP: $367.95Now: $235.00Was: $367.95Subtotal: -
Hot Cams Cam Chain for Suzuki RM-Z450 2005-2024 HC82RH2010124
HOT CAMS
$63.95Experience superior performance with the HOT CAMS Cam Chain HC82RH2010124. Designed with exclusive heat-treated links, this silent chain provides exceptional friction and impact resistance, ensuring longevity and reliability. Engineered to surpass OEM...09250760- SKU:
- 09250760
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- CHAIN SIZE:
- 82RH2010
- COLOR/FINISH:
- RAW
- MATERIAL:
- STEEL
- UNITS:
- EACH
- MODEL:
- SILENT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CAM
- PRODUCT NAME:
- CHAIN
- BASE FINISH:
- RAW
$63.95 -
Wossner Top End Bearing Yamaha YZ125 1997-2001 N1011
WOSSNER
$18.50The WOSSNER Top End Bearing is engineered for high-performance applications, ensuring optimal durability and efficiency. With precise dimensions and robust construction, this bearing is designed to enhance the reliability of your engine's top end...09240451- SKU:
- 09240451
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- LENGTH METRIC:
- 17.8 MM
- INSIDE DIAMETER METRIC:
- 15 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- APPLICATION:
- CONNECTING ROD
- OUTSIDE DIAMETER METRIC:
- 20 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
$18.50Qty in Cart: 0Quantity:Price:$18.50Subtotal: -
On Sale
HOT RODS Crank Bearings K012
HOT RODS
MSRP: $113.95Now: $102.56Was: $113.95Precision, high-quality main bearing and seal kits complement installation of Hot Rods crankshaft assemblies09240034- SKU:
- 09240034
- Availability:
- Ships Same Business Day
- Weight:
- 1.42 LBS
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
MSRP: $113.95Now: $102.56Was: $113.95 -
On Sale
HOT RODS Crank Bearings K009
HOT RODS
MSRP: $64.95Now: $58.46Was: $64.95Precision, high-quality main bearing and seal kits complement installation of Hot Rods crankshaft assemblies09240031- SKU:
- 09240031
- Availability:
- Ships Same Business Day
- Weight:
- 0.91 LBS
- TYPE:
- BALL
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- MAIN CRANKSHAFT
- UNITS:
- KIT
MSRP: $64.95Now: $58.46Was: $64.95Qty in Cart: 0Quantity:Price:MSRP: $64.95Now: $58.46Was: $64.95Subtotal: -
On Sale
ATHENA Connecting Rod Kit P40321046
ATHENA
MSRP: $126.95Now: $114.00Was: $126.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230490- SKU:
- 09230490
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- DISPLACEMENT:
- 300 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- DISPLACEMENT:
- 250 CC
- RIDING STYLE:
- STREET
MSRP: $126.95Now: $114.00Was: $126.95 -
On Sale
ATHENA Connecting Rod Kit P40321047
ATHENA
MSRP: $121.95Now: $110.00Was: $121.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230488- SKU:
- 09230488
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- RIDING STYLE:
- STREET
- DISPLACEMENT:
- 125 CC
- DISPLACEMENT:
- 144 CC
- UNITS:
- KIT
- DISPLACEMENT:
- 150 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $121.95Now: $110.00Was: $121.95Qty in Cart: 0Quantity:Price:MSRP: $121.95Now: $110.00Was: $121.95Subtotal: -
On Sale
ATHENA Connecting Rod Kit P40321039
ATHENA
MSRP: $98.95Now: $89.00Was: $98.95High-quality, lightweight connecting rods, Made with similar materials to the OEM component to ensure the same performance, Superficial high-frequency treatment for higher resistance that reduces rotational and alternating stresses, Kits include...09230485- SKU:
- 09230485
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- DISPLACEMENT:
- 65 CC
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $98.95Now: $89.00Was: $98.95 -
On Sale
HOT RODS Connecting Rod 8684
HOT RODS
MSRP: $225.95Now: $203.36Was: $225.95Heavy-duty OE replacement connecting rods, Certified 8620 AISI steel provides superior strength, Crankpins are manufactured from hot-rolled ASTM 4115 and case hardened to 58-62Rc, Feature the latest in caged needle roller bearing designs for high rpm...09230275- SKU:
- 09230275
- Availability:
- Ships Same Business Day
- Weight:
- 1.74 LBS
- MATERIAL:
- 8620 STEEL
- ENGINE TYPE:
- 4-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $225.95Now: $203.36Was: $225.95Qty in Cart: 0Quantity:Price:MSRP: $225.95Now: $203.36Was: $225.95Subtotal: -
On Sale
HOT RODS Connecting Rod 8669
HOT RODS
MSRP: $151.95Now: $136.76Was: $151.95Heavy-duty OE replacement connecting rods, Certified 8620 AISI steel provides superior strength, Crankpins are manufactured from hot-rolled ASTM 4115 and case hardened to 58-62Rc, Feature the latest in caged needle roller bearing designs for high rpm...09230226- SKU:
- 09230226
- Availability:
- Ships Same Business Day
- Weight:
- 1.13 LBS
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
MSRP: $151.95Now: $136.76Was: $151.95Qty in Cart: 0Quantity:Price:MSRP: $151.95Now: $136.76Was: $151.95Subtotal: -
On Sale
HOT RODS Crankshaft Kit 4416
HOT RODS
MSRP: $489.95Now: $440.96Was: $489.95Sold complete with the original proven Hot Rods connecting rods, top-end bearings and crankshaft webs, Factory assembled and trued to OEM specifications; meet or surpass OEM in performance and durability, Complete and ready for installation, Completely...09210516- SKU:
- 09210516
- Availability:
- Ships Same Business Day
- Weight:
- 6.95 LBS
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 53.60 MM
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 4-CYCLE
- TYPE:
- OEM STROKE
MSRP: $489.95Now: $440.96Was: $489.95 -
On Sale
VERTEX Wrist Pin 715036
VERTEX
MSRP: $4.95Now: $4.46Was: $4.95Case hardened wrist pins utilize nitride coatings that produce a high performance, wear resistant wrist pin., Coating wrist pins with a nitride coating is advantageous because it allows the desired surface hardness to be obtained without quenching and...09130103- SKU:
- 09130103
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- PISTON
- UNITS:
- EACH
MSRP: $4.95Now: $4.46Was: $4.95Qty in Cart: 0Quantity:Price:MSRP: $4.95Now: $4.46Was: $4.95Subtotal: -
On Sale
ATHENA Piston Ring Set S41316209
ATHENA
MSRP: $31.95Now: $29.00Was: $31.95Replacement rings for Athena Forged Pistons09120434- SKU:
- 09120434
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- UNITS:
- SET
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 52.96 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
MSRP: $31.95Now: $29.00Was: $31.95 -
On Sale
VERTEX Piston Ring 590276800001
VERTEX
MSRP: $76.95Now: $69.26Was: $76.95Replacement piston rings, Nitride coated or chrome plated, increasing wear resistance and extending durability, The latest generation for both two-stroke and four-stroke engines; four-stroke piston rings are sold in sets and two-stroke piston rings are...09120386- SKU:
- 09120386
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- BORE SIZE METRIC:
- 76.80 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
- PISTON DIAMETER METRIC:
- 77.95 MM
- UNITS:
- SET
MSRP: $76.95Now: $69.26Was: $76.95Qty in Cart: 0Quantity:Price:MSRP: $76.95Now: $69.26Was: $76.95Subtotal:
