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 Crankshaft Kit CBK0167
HOT RODS
$858.95Assembly 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 completely rebuildable with genuine Hot Rods...09210387- SKU:
- 09210387
- Availability:
- Ships Same Business Day
- Weight:
- 10.05 LBS
- TYPE:
- OEM
- PRODUCT NAME:
- CRANKSHAFT KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$858.95 -
HOT RODS Crankshaft 4021
HOT RODS
$477.95Sold 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...09210388- SKU:
- 09210388
- Availability:
- Ships Same Business Day
- Weight:
- 7.18 LBS
- COLOR/FINISH:
- STEEL
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 250 CC
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MODEL:
- 4-CYCLE
- STROKE LENGTH METRIC:
- 53.60 MM
- TYPE:
- OEM STROKE
$477.95 -
HOT RODS Crankshaft 4031
HOT RODS
$404.95Sold 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...09210389- SKU:
- 09210389
- Availability:
- Ships Same Business Day
- Weight:
- 4.06 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH METRIC:
- 40.80 MM
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- DISPLACEMENT:
- 65 CC
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- MODEL:
- 2-CYCLE
$404.95 -
HOT RODS Crankshaft 4098
HOT RODS
$465.95Sold 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...09210244- SKU:
- 09210244
- Availability:
- Ships Same Business Day
- Weight:
- 9.45 LBS
- FEATURES:
- STANDARD CRANKSHAFT
- MODEL:
- 4-CYCLE
- TYPE:
- OEM STROKE
- DISPLACEMENT:
- 450 CC
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 60.80 MM
$465.95 -
HOT RODS Crankshaft - Stroker 4197
HOT RODS
$337.95Hot Rods has developed six long-stroke applications for ATVs, Special pistons for TRX400EX, KFX/LTZ 400, Banshee, Warrior and Raptor make these installations simple by avoiding machine work and parts typically required for long-stroke engines09210246- SKU:
- 09210246
- Availability:
- Ships Same Business Day
- Weight:
- 7.50 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STROKER
- DISPLACEMENT:
- 259 CC
- MODEL:
- 4-CYCLE
- STROKE LENGTH:
- 55,80 MM
- STROKE LENGTH METRIC:
- 55.80 MM
- COLOR/FINISH:
- STEEL
- FEATURES:
- HEAVY DUTY CRANKSHAFT
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
$337.95 -
HOT RODS Crankshaft Kit CBK0187
HOT RODS
$576.95Assembly 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 completely rebuildable with genuine Hot Rods...09210504- SKU:
- 09210504
- Availability:
- Ships Same Business Day
- Weight:
- 6.75 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$576.95 -
HOT RODS Crankshaft Kit CBK0188
HOT RODS
$441.95Assembly 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 completely rebuildable with genuine Hot Rods...09210505- SKU:
- 09210505
- Availability:
- Ships Same Business Day
- Weight:
- 4.60 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$441.95 -
HOT RODS Crankshaft Kit CBK0191
HOT RODS
$711.95Assembly 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 completely rebuildable with genuine Hot Rods...09210521- SKU:
- 09210521
- Availability:
- Ships Same Business Day
- Weight:
- 13.40 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- UNITS:
- KIT
$711.95 -
HOT RODS Crankshaft Assembly 4053
HOT RODS
$229.95Sold 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...09210021- SKU:
- 09210021
- Availability:
- Ships Same Business Day
- Weight:
- 6.22 LBS
- DISPLACEMENT:
- 125 CC
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.60 MM
$229.95 -
HOT RODS Crankshaft Assembly 4055
HOT RODS
$282.95Sold 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...09210023- SKU:
- 09210023
- Availability:
- Ships Same Business Day
- Weight:
- 6.36 LBS
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- MODEL:
- 2-CYCLE
- COLOR/FINISH:
- STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 54.60 MM
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- UNITS:
- ASSEMBLY
$282.95 -
HOT RODS Crankshaft Assembly - Stroker 4116
HOT RODS
$268.95Hot Rods has developed six long-stroke applications for ATVs, Special pistons for TRX400EX, KFX/LTZ 400, Banshee, Warrior and Raptor make these installations simple by avoiding machine work and parts typically required for long-stroke engines09210025- SKU:
- 09210025
- Availability:
- Ships Same Business Day
- Weight:
- 4.60 LBS
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- STROKE LENGTH:
- 47,80 MM
- DISPLACEMENT:
- 85 CC TO 100 CC
- UNITS:
- ASSEMBLY
- COLOR/FINISH:
- STEEL
- FEATURES:
- STANDARD CRANKSHAFT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- STROKER
- MATERIAL:
- 4140 STEEL
- MODEL:
- 2-CYCLE
- STROKE LENGTH METRIC:
- 47.80 MM
$268.95 -
HOT RODS Crankshaft 4061
HOT RODS
$834.95Sold 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...09210037- SKU:
- 09210037
- Availability:
- Ships Same Business Day
- Weight:
- 21.89 LBS
- FEATURES:
- STANDARD CRANKSHAFT
- TYPE:
- OEM STROKE
- MATERIAL:
- 4140 STEEL
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- ASSEMBLY
- DISPLACEMENT:
- 743 CC TO 781 CC
- MODEL:
- 2-CYCLE
- PRODUCT NAME:
- CRANKSHAFT ASSEMBLY
- COLOR/FINISH:
- STEEL
- STROKE LENGTH METRIC:
- 37.00 MM
$834.95 -
HOT RODS Crankshaft Kit CBK0053
HOT RODS
$392.95Assembly 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 completely rebuildable with genuine Hot Rods...09210301- SKU:
- 09210301
- Availability:
- Ships Same Business Day
- Weight:
- 6.70 LBS
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
$392.95 -
HOT RODS Crankshaft Kit CBK0002
HOT RODS
$368.95Assembly 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 completely rebuildable with genuine Hot Rods...09210261- SKU:
- 09210261
- Availability:
- Ships Same Business Day
- Weight:
- 6.65 LBS
- PRODUCT NAME:
- CRANKSHAFT KIT
- TYPE:
- OEM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$368.95 -
COMETIC Top End Gasket Set - Suzuki C7778
COMETIC
$40.95Top 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 sealing surface, providing less bore...C7778- SKU:
- C7778
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- GASKET KIT
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$40.95 -
COMETIC Shift Shaft Seal OS236
COMETIC
$5.95High-quality seals allow for proper sealing of common leaks, Made of quality materials developed for maximum performance tolerances and longevity, Recommended to replace the countershaft sprocket seal when servicing/replacing the countershaft sprocket,...09350875- SKU:
- 09350875
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- SHIFTER SHAFT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SEAL
- UNITS:
- EACH
$5.95 -
COMETIC Top End Gaskets - KTM C3606
COMETIC
$74.95Gaskets and gasket sets used by professionals in high-performance machines and as OE replacements worldwide, Each Kit contains the proper number of gaskets for one application, Made in the U.S.A.09345414- SKU:
- 09345414
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- SET
$74.95 -
COMETIC Lower End Gaskets - KTM C3606BE
COMETIC
$115.95Gaskets and gasket sets used by professionals in high-performance machines and as OE replacements worldwide, Each Kit contains the proper number of gaskets for one application, Made in the U.S.A.09345415- SKU:
- 09345415
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- BOTTOM END
- UNITS:
- SET
$115.95 -
COMETIC Top End Gasket Set - Husqvarna C7734
COMETIC
$29.95Top 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 sealing surface, providing less bore...C7734- SKU:
- C7734
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BORE SIZE METRIC:
- 54.00 MM
- THICKNESS IMPERIAL:
- 0,012'
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- TOP END
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
$29.95 -
COMETIC Top End Gasket Set - Honda C7757
COMETIC
$47.95Top 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 sealing surface, providing less bore...C7757- SKU:
- C7757
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BORE SIZE METRIC:
- 54.00 MM
- THICKNESS IMPERIAL:
- 0,012'
- THICKNESS METRIC:
- 0.31 MM
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$47.95
