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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Hiflofiltro Oil Filter for Honda CBR250R 2011-2013 HF112
HIFLOFILTRO
$3.92HIFLOFILTRO Oil Filter HF112 Experience superior engine protection with the HIFLOFILTRO Oil Filter HF112, designed to meet or exceed OEM specifications. This premium oil filter ensures optimal performance and longevity for your vehicle, making it an...HF112- SKU:
- HF112
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- BLACK
- COLOR/FINISH:
- RED
- LENGTH METRIC:
- 38 MM
- RIDING STYLE:
- STREET
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- BASE COLOR:
- RED
- RIDING STYLE:
- ATV
- STYLE:
- PREMIUM
- UNITS:
- EACH
- WIDTH METRIC:
- 50 MM
$3.92 -
HOT RODS Crankshaft Assembly 4138
HOT RODS
$430.95HOT RODS Crankshaft Assembly 4138Sold 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...H134- SKU:
- H134
- Availability:
- Ships Same Business Day
- Weight:
- 8.92 LBS
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 49.80 MM
- DISPLACEMENT:
- 250 CC
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
$430.95 -
HOT RODS Crankshaft Assembly 4017
HOT RODS
$465.95HOT RODS Crankshaft Assembly 4017Sold 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...H128X- SKU:
- H128X
- Availability:
- Ships Same Business Day
- Weight:
- 9.46 LBS
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 250 CC
- MATERIAL:
- 4140 STEEL
- MODEL:
- 2-CYCLE
- STROKE LENGTH METRIC:
- 72.00 MM
- TYPE:
- OEM STROKE
- FEATURES:
- STANDARD CRANKSHAFT
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
$465.95 -
HOT RODS Crankshaft Assembly 4036
HOT RODS
$392.95HOT RODS Crankshaft Assembly 4036Sold 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...H125X- SKU:
- H125X
- Availability:
- Ships Same Business Day
- Weight:
- 6.20 LBS
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.60 MM
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 125 CC
- FEATURES:
- STANDARD CRANKSHAFT
$392.95 -
HOT RODS Crankshaft Assembly 4035
HOT RODS
$417.95HOT RODS Crankshaft Assembly 4035Sold 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...H124- SKU:
- H124
- Availability:
- Ships Same Business Day
- Weight:
- 6.30 LBS
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 125 CC
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.60 MM
$417.95Qty in Cart: 0Quantity:Price:$417.95Subtotal: -
HOT RODS Crankshaft Assembly 4034
HOT RODS
$257.95HOT RODS Crankshaft Assembly 4034Sold 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...H123- SKU:
- H123
- Availability:
- Ships Same Business Day
- Weight:
- 4.45 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 85 CC
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
$257.95 -
HOT RODS Crankshaft Assembly 4033
HOT RODS
$294.95HOT RODS Crankshaft Assembly 4033Sold 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...H122- SKU:
- H122
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 80 CC
- MATERIAL:
- 4140 STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
$294.95 -
HOT RODS Crankshaft Assembly 4016
HOT RODS
$270.95HOT RODS Crankshaft Assembly 4016Sold 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...H119- SKU:
- H119
- Availability:
- Ships Same Business Day
- Weight:
- 4.50 LBS
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 80 CC TO 100 CC
- FEATURES:
- STANDARD CRANKSHAFT
- STROKE LENGTH METRIC:
- 45.80 MM
- TYPE:
- OEM STROKE
- COLOR/FINISH:
- STEEL
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
$270.95 -
HOT RODS Crankshaft Assembly 4012
HOT RODS
$183.95HOT RODS Crankshaft Assembly 4012Sold 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...H115- SKU:
- H115
- Availability:
- Ships Same Business Day
- Weight:
- 4.65 LBS
- MODEL:
- 2-CYCLE
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- DISPLACEMENT:
- 80 CC
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 48.00 MM
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
$183.95 -
HOT RODS Crankshaft Assembly 4002
HOT RODS
$397.95HOT RODS Crankshaft Assembly 4002Sold 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...H101- SKU:
- H101
- Availability:
- Ships Same Business Day
- Weight:
- 9.19 LBS
- MATERIAL:
- 4140 STEEL
- STROKE LENGTH METRIC:
- 72.00 MM
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 250 CC
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 2-CYCLE
- TYPE:
- OEM STROKE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- STEEL
$397.95 -
Hot Cams Stage 1 Camshaft for Honda CRF450R 2002-2006 1016-1
HOT CAMS
$415.95HOT CAMS Camshaft 1016-1 Elevate your racing performance with the HOT CAMS Camshaft 1016-1, engineered for enthusiasts seeking maximum power and responsiveness. Available in Stage 1 and Stage 2 options, these camshafts seamlessly integrate with stock...CRF450S1A- SKU:
- CRF450S1A
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- EXHAUST DURATION IMPERIAL:
- 270°
- INTAKE LIFT METRIC:
- 9.60 MM
- EXHAUST LIFT METRIC:
- 8.80 MM
- INTAKE DURATION IMPERIAL:
- 238°
- RIDING STYLE:
- ATV
- TYPE:
- STAGE 1
- APPLICATION:
- EXHAUST
- APPLICATION:
- INTAKE
- UNITS:
- EACH
- PRODUCT NAME:
- CAMSHAFT
$415.95 -
HOT RODS Connecting Rod 8159
HOT RODS
$140.95HOT RODS Connecting Rod 8159Heavy-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...CR177- SKU:
- CR177
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
$140.95 -
HOT RODS Connecting Rod 8143
HOT RODS
$140.95HOT RODS Connecting Rod 8143Heavy-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...CR174- SKU:
- CR174
- Availability:
- Ships Same Business Day
- Weight:
- 0.81 LBS
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- ENGINE TYPE:
- 2-CYCLE
$140.95 -
HOT RODS Connecting Rod 8147
HOT RODS
$128.95HOT RODS Connecting Rod 8147Heavy-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...CR171- SKU:
- CR171
- Availability:
- Ships Same Business Day
- Weight:
- 0.63 LBS
- ENGINE TYPE:
- 2-CYCLE
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
$128.95 -
HOT RODS Connecting Rod 8139
HOT RODS
$153.95HOT RODS Connecting Rod 8139Heavy-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...CR166- SKU:
- CR166
- Availability:
- Ships Same Business Day
- Weight:
- 1.50 LBS
- MATERIAL:
- 8620 STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- ENGINE TYPE:
- 2-CYCLE
- PRODUCT NAME:
- CONNECTING ROD KIT
$153.95 -
HOT RODS Connecting Rod 8140
HOT RODS
$162.95HOT RODS Connecting Rod 8140Heavy-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...CR165- SKU:
- CR165
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- FEATURES:
- INCLUDES THRUST WASHERS
- ENGINE TYPE:
- 2-CYCLE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
$162.95 -
HOT RODS Connecting Rod 8148
HOT RODS
$189.95HOT RODS Connecting Rod 8148Heavy-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...CR164- SKU:
- CR164
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
$189.95 -
HOT RODS Connecting Rod 8141
HOT RODS
$147.95HOT RODS Connecting Rod 8141Heavy-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...CR161- SKU:
- CR161
- Availability:
- Ships Same Business Day
- Weight:
- 1.06 LBS
- MATERIAL:
- 8620 STEEL
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-CYCLE
- FEATURES:
- INCLUDES THRUST WASHERS
- UNITS:
- KIT
$147.95 -
HOT RODS Connecting Rod 8142
HOT RODS
$135.95HOT RODS Connecting Rod 8142Heavy-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...CR160- SKU:
- CR160
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-CYCLE
- UNITS:
- KIT
- FEATURES:
- INCLUDES THRUST WASHERS
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 8620 STEEL
$135.95Qty in Cart: 0Quantity:Price:$135.95Subtotal: -
COMETIC Top End Gasket Set - YZ250 C7855
COMETIC
$47.95COMETIC Top End Gasket Set YZ250 C7855Top end gasket kits include correct base, head gasket and cylinder O-rings as well as other top end specific O-rings or seals needed for R&R of top end, MLS head gaskets promote an even torque load across the gasket...C7855- SKU:
- C7855
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$47.95
