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!
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- Qty in Cart
- Quantity
- Price
- Subtotal
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Wiseco Piston Kit Standard Yamaha YZ125 2005-2021 845M05400
WISECO
$129.95Upgrade your YZ 125/X with the WISECO Piston Kit, designed for optimal performance and durability. This kit ensures a precise fit and enhanced power delivery, making it a perfect choice for both casual riders and competitive racers. Please note that this...09100571- SKU:
- 09100571
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE SIZE METRIC:
- 54.00 MM
- MODEL:
- PRO-LITE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
$129.95 -
Wiseco YZ85 2002-2018 Piston Kit with Gaskets PK1202
WISECO
$164.95Wiseco PK1202 Piston Kit Elevate your dirt bike's performance with the Wiseco PK1202 Piston Kit, meticulously crafted for high-performance 2-stroke engines. This piston kit combines advanced engineering with premium materials to ensure you achieve...09030299- SKU:
- 09030299
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 47.50 MM
- DISPLACEMENT:
- 85 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 47.80 MM
- TYPE:
- TOP END
- UNITS:
- KIT
$164.95 -
K & N Oil Filter KN-207
K & N
$11.99K&N delivers a premium oil filter which is built with a synthetic media specifically designed to withstand the high concentrates of synthetic racing oils, A large filter media provides high-flow rates and outstanding oil filtration to keep your motor...07120033- SKU:
- 07120033
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- BASE COLOR:
- RED
- UNITS:
- EACH
- BASE FINISH:
- NATURAL
- COLOR/FINISH:
- RED
- FILTER MEDIA MATERIAL:
- SYNTHETIC
- LENGTH METRIC:
- 44 MM
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
$11.99 -
Hot Cams Valve Shim 8.90mm x 2.52mm for KTM 250 SX-F 2005-2011 5PK890252
HOT CAMS
$10.95Enhance your engine's performance with our premium Valve Shim pack, designed for precision and reliability. Each shim measures 8.90 x 2.52, making them perfect for a variety of applications. This 5-pack ensures you have the necessary replacements to keep...09261369- SKU:
- 09261369
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$10.95 -
HOT RODS Main Bearing Seal Kit - Can-Am HR00101
HOT RODS
$67.95Main Bearing Seal Kit - Can-Am Precision, high-quality main bearing and seal kit complement installation of Hot Rods crankshaft assemblies, Kit contains two main bearings and two seals, unless noted09240639- SKU:
- 09240639
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
$67.95 -
HOT RODS Main Bearing Seal Kit - Can-Am HR00102
HOT RODS
$176.95Main Bearing Seal Kit - HR00102 Designed specifically for Can-Am vehicles Includes two high-performance main bearings Contains two durable seals for optimal protection Perfectly complements Hot Rods crankshaft assemblies Engineered...09240640- SKU:
- 09240640
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
$176.95 -
HOT RODS Plain Bearing Crankshaft - Can-Am HR00103
HOT RODS
$57.95Plain Bearing Crankshaft - HR00103 Compatible with Can-Am models for seamless integration. Constructed from high-quality materials for durability and longevity. Designed to meet or exceed OEM specifications for reliable performance. ...09240641- SKU:
- 09240641
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$57.95 -
HOT RODS Plain Bearing Crankshaft - Can-Am HR00104
HOT RODS
$57.95Plain Bearing Crankshaft - HR00104 Designed specifically for Can-Am vehicles High-quality OEM replacement for durability and reliability Includes complete main bearing and seal kits Meets or exceeds original equipment standards ...09240642- SKU:
- 09240642
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$57.95 -
HOT RODS Connecting Rod Kit - Yamaha 8618
HOT RODS
$215.95Connecting Rod Kit - Yamaha Heavy-duty OE replacement connecting rods, Certified 8620 AISI steel provides superior strength, Crankpins are manufactured from hot-rolled ASTM 4115 and case hardened to level of 58-62Rc, Feature the latest in caged needle...09230042- SKU:
- 09230042
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
$215.95 -
HOT RODS Connecting Rod Kit - Can- Am HR00062
HOT RODS
$196.95Connecting Rod Kit - Can- Am Heavy-duty OE replacement connecting rod, Certified 8620 AISI steel provides superior strength, Uniquely designed big end uses strategically located side scalloping vent slots to minimize high-RPM bearing race distortion,...09210884- SKU:
- 09210884
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
$196.95 -
HOT RODS Crankshaft Assembly - OEM Stroke - Can-Am HR00064
HOT RODS
$957.95Crankshaft Assembly - OEM Stroke - Can-Am Sold 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,...09210886- SKU:
- 09210886
- Availability:
- Ships Same Business Day
- Weight:
- 15.70 LBS
$957.95 -
HOT RODS Crankshaft Assembly - OEM Stroke - Polaris HR00027
HOT RODS
$931.95Crankshaft Assembly - OEM Stroke - Polaris Sold complete with the original proven Hot Rods connecting rods, top-end bearings (unless otherwise noted) and crankshaft webs, Factory assembled and trued to OEM specifications; meets or exceeds OEM in...09210887- SKU:
- 09210887
- Availability:
- Ships Same Business Day
- Weight:
- 15.30 LBS
$931.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Honda HR00105
HOT RODS
$613.95Bottom End Kit - OE Crankshaft Replacement - Honda Kit features everything needed to complete crankshaft installation including Hot Rods main bearings and seals kit plus a complete engine gasket set that includes all gaskets and seals for a complete...09210889- SKU:
- 09210889
- Availability:
- Ships Same Business Day
- Weight:
- 13.50 LBS
$613.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Polaris HR00108
HOT RODS
$1,473.95Bottom End Kit - OE Crankshaft Replacement - Polaris Kit features everything needed to complete crankshaft installation including Hot Rods main bearings and seals kit plus a complete engine gasket set that includes all gaskets and seals for a complete...09210892- SKU:
- 09210892
- Availability:
- Ships Same Business Day
- Weight:
- 29.90 LBS
$1,473.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Polaris HR00110
HOT RODS
$1,473.95Bottom End Kit - OE Crankshaft Replacement - Polaris Kit features everything needed to complete crankshaft installation including Hot Rods main bearings and seals kit plus a complete engine gasket set that includes all gaskets and seals for a complete...09210893- SKU:
- 09210893
- Availability:
- Ships Same Business Day
- Weight:
- 28.00 LBS
$1,473.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Polaris HR00111
HOT RODS
$1,473.95Bottom End Kit - OE Crankshaft Replacement - Polaris Kit features everything needed to complete crankshaft installation including Hot Rods main bearings and seals kit plus a complete engine gasket set that includes all gaskets and seals for a complete...09210894- SKU:
- 09210894
- Availability:
- Ships Same Business Day
- Weight:
- 27.45 LBS
$1,473.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Polaris HR00120
HOT RODS
$1,360.95Bottom End Kit - OE Crankshaft Replacement - Polaris Kit features everything needed to complete crankshaft installation including Hot Rods main bearings and seals kit plus a complete engine gasket set that includes all gaskets and seals for a complete...09210899- SKU:
- 09210899
- Availability:
- Ships Same Business Day
- Weight:
- 24.05 LBS
$1,360.95 -
HOT RODS Connecting Rod Bolt Kit - Can-Am HR00092
HOT RODS
$59.95Connecting Rod Bolt Kit - Can-Am Includes all connecting rod bolts necessary to rebuild an engine09230633- SKU:
- 09230633
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
$59.95 -
HOT RODS Crankshaft Kit - OE Crankshaft Replacement - Suzuki CBK0081
HOT RODS
$576.95Crankshaft Kit - OE Crankshaft Replacement - Suzuki Assembly sold complete with Hot Rods connecting rod, Factory assembled and true to OEM specifications, Hot Rods cranks will meet or surpass the OEM in performance, Ready for installation, Crankshaft is...09210328- SKU:
- 09210328
- Availability:
- Ships Same Business Day
- Weight:
- 9.10 LBS
$576.95 -
HOT RODS Crankshaft Kit - OE Crankshaft Replacement - Kawasaki CBK0118
HOT RODS
$736.95Crankshaft Kit - OE Crankshaft Replacement - Kawasaki Assembly sold complete with Hot Rods connecting rod, Factory assembled and true to OEM specifications, Hot Rods cranks will meet or surpass the OEM in performance, Ready for installation, Crankshaft...09210355- SKU:
- 09210355
- Availability:
- Ships Same Business Day
- Weight:
- 13.35 LBS
$736.95
