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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Cylinder Works Standard Bore Cylinder Kit Yamaha YZ450F 2014-2017 20005-K02
CYLINDER WORKS
$744.95Upgrade your engine with the Cylinder Works Cylinder Kit, designed for seamless installation and optimal performance. This ready-to-install kit features a direct bolt-on design that mirrors OEM specifications, ensuring a perfect fit without the need for...09310585- SKU:
- 09310585
- Availability:
- Ships Same Business Day
- Weight:
- 4.55 LBS
- CYLINDER DIAMETER:
- 97,00 MM
- DISPLACEMENT:
- 449 CC
- ENGINE TYPE:
- 4-CYCLE
- PRODUCT NAME:
- CYLINDER KIT
- STYLE:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- CYLINDER DIAMETER METRIC:
- 97.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$744.95 -
Cylinder Works YZ 250 1999-2024 Standard Bore Cylinder Kit 20009-K01
CYLINDER WORKS
$780.95Upgrade your engine with the CYLINDER WORKS Standard Bore Cylinder Kit, designed for seamless installation and optimal performance. This kit offers a perfect blend of durability and efficiency, ensuring your engine runs smoothly while maintaining the...09310587- SKU:
- 09310587
- Availability:
- Ships Same Business Day
- Weight:
- 7.35 LBS
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$780.95 -
Cylinder Works YZ125 2005-2021 Cylinder Head CH2005-K01
CYLINDER WORKS
$134.95Upgrade your engine's performance with the CYLINDER WORKS CH2005-K01 Cylinder Head. This precision-engineered replacement head is designed to enhance airflow and improve combustion efficiency, making it an ideal choice for performance enthusiasts...09300205- SKU:
- 09300205
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- CYLINDER HEAD
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
$134.95 -
Cylinder Works High Compression Cylinder Kit for Honda CRF250R 2008-2009 10001-K02HC
CYLINDER WORKS
$597.95Upgrade your engine's performance with the High Compression Cylinder Kit, designed for effortless installation and optimal efficiency. Crafted with precision, this kit enhances power output while maintaining the reliability and aesthetics of OEM...09310290- SKU:
- 09310290
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- COMPRESSION RATIO IMPERIAL:
- 13.5:1
- PRODUCT NAME:
- CYLINDER KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 78.00 MM
- CYLINDER DIAMETER:
- 78,00 MM
- DISPLACEMENT:
- 249 CC
- ENGINE TYPE:
- 4-CYCLE
- STYLE:
- HIGH COMPRESSION
$597.95 -
DEL WEST Exhaust Valve DW-RMZ450-EV08
DEL WEST
$155.95Meets the demands of off-road, all valves are backed by an established record of performance and reliability in competition that is unapproachable09261063- SKU:
- 09261063
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- UNITS:
- EACH
$155.95 -
DEL WEST Intake Valve DW-RMZ450-IV05
DEL WEST
$155.95Meets the demands of off-road, all valves are backed by an established record of performance and reliability in competition that is unapproachable09261064- SKU:
- 09261064
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95 -
DEL WEST Intake Valve DW-CRF150RIV07
DEL WEST
$155.95Meets the demands of off-road, all valves are backed by an established record of performance and reliability in competition that is unapproachable09262217- SKU:
- 09262217
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95 -
MOOSE RACING Oil Pump Cover - KTM/Husky T04-5101B
MOOSE RACING
$32.95CNC Machined covers made from 6061 T6 Aluminum, Black anodized finish for added looks and appeal, Aluminum cover helps dissipate added heat from engine oil, Light weight and durable design09401936- SKU:
- 09401936
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- MATERIAL:
- 6061 T-6 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- ANODIZED
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- TYPE:
- OIL PUMP
- UNITS:
- EACH
$32.95 -
POWERSTANDS RACING Oil Cap Kit - Black - M18 x 1.5 00-01308-22
POWERSTANDS RACING
$31.95CNC-machined from high-quality aluminum, E-clip is already safety wired to a mounting tab and the wire covered with silicon tubing that will not melt or discolor, Excellent resistance to extreme heat09500558- SKU:
- 09500558
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- CAP KIT
- TYPE:
- OIL FILLER
- DIAMETER - THREAD SIZE IMPERIAL:
- M18 X 1.5
- MATERIAL:
- ALUMINUM
$31.95 -
POWERSTANDS RACING Oil Cap Kit - Orange - M24 x 3.0 00-01309-28
POWERSTANDS RACING
$31.95CNC-machined from high-quality aluminum, E-clip is already safety wired to a mounting tab and the wire covered with silicon tubing that will not melt or discolor, Excellent resistance to extreme heat09500559- SKU:
- 09500559
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- ORANGE
- DIAMETER - THREAD SIZE IMPERIAL:
- M24 X 3.0
- PRODUCT NAME:
- CAP KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
- UNITS:
- KIT
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
$31.95 -
POWERSTANDS RACING Oil Cap Kit - Gold - M20 x 1.5 00-01310-23
POWERSTANDS RACING
$31.95CNC-machined from high-quality aluminum, E-clip is already safety wired to a mounting tab and the wire covered with silicon tubing that will not melt or discolor, Excellent resistance to extreme heat09500560- SKU:
- 09500560
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- GOLD
- PRODUCT NAME:
- CAP KIT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
- UNITS:
- KIT
- COLOR/FINISH:
- ANODIZED
- DIAMETER - THREAD SIZE IMPERIAL:
- M20 X 1.5
- MATERIAL:
- ALUMINUM
- RIDING STYLE:
- STREET
$31.95 -
Pro Filter Oil Filter for 2006-2009 Aprilia RXV 450 PF-563
PRO FILTER
$7.99Upgrade your engine's performance with the PRO FILTER Replacement Oil Filter PF-563. Designed to meet and exceed OEM specifications, this high-performance filter ensures optimal filtration and flow rates, providing superior protection for your engine...07120618- SKU:
- 07120618
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- STYLE:
- PREMIUM
- BASE FINISH:
- CHROME
- COLOR/FINISH:
- CHROME
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$7.99 -
Wrench Rabbit Engine Rebuild Kit Suzuki RM85 2002-2004 WR101-068
WRENCH RABBIT
$572.95Upgrade your Suzuki with the WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This comprehensive kit includes everything you need for a reliable engine performance, ensuring your bike runs like new. Complete Rebuild...09031004- SKU:
- 09031004
- Availability:
- Ships Same Business Day
- Weight:
- 8.75 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$572.95 -
Wrench Rabbit Suzuki RM85 2005-2020 Engine Rebuild Kit WR101-069
WRENCH RABBIT
$572.95Revitalize your Suzuki engine with the comprehensive WRENCH RABBIT Engine Kit, designed for a seamless and professional rebuild. This all-in-one kit includes high-quality components to ensure your engine runs smoothly and efficiently, making it the ideal...09031005- SKU:
- 09031005
- Availability:
- Ships Same Business Day
- Weight:
- 8.70 LBS
- TYPE:
- ENGINE
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$572.95 -
XCELDYNE Valve Locks XLOM55761
XCELDYNE
$38.18CNC-machined from 8620 steel, Industry first color coded, purpose-built intake-sized and exhaust-sized design, Design allows keepers to stay locked at higher rpm09260529- SKU:
- 09260529
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- UNITS:
- SET OF 4
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- LOCK
$38.18 -
XCELDYNE Valve Spring Locators XSSM13000
XCELDYNE
$52.06Lightweight CNC-machined titanium retainers greatly reduce valve train mass and increase engine rpm, Increases valve spring life over heavier, stock steel retainers, Precision CNC-machined from 8620 case hardened steel, High tolerances ensure seats are...09260546- SKU:
- 09260546
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SPRING LOCATOR
- UNITS:
- 4 PACK
$52.06Qty in Cart: 0Quantity:Price:$52.06Subtotal: -
SHINDY Needle Bearing - 18 mm x 22 mm x 24 mm 10-201
SHINDY
$12.40Piston pin needle cage bearings are manufactured from precision bearings and high-quality housing material, Each bearing is packaged in an individual box for easy identificationNB1453- SKU:
- NB1453
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- OUTSIDE DIAMETER METRIC:
- 22 MM
- TYPE:
- NEEDLE
- OUTSIDE DIAMETER:
- 22 MM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 24 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER:
- 18 MM
- INSIDE DIAMETER METRIC:
- 18 MM
- LENGTH:
- 24 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$12.40 -
SHINDY Needle Bearing - 14 mm x 18 mm x 16 mm 10-054
SHINDY
$11.50Piston pin needle cage bearings are manufactured from precision bearings and high-quality housing material, Each bearing is packaged in an individual box for easy identificationNB1461- SKU:
- NB1461
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- APPLICATION:
- PISTON
- LENGTH METRIC:
- 16 MM
- OUTSIDE DIAMETER:
- 18 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER METRIC:
- 14 MM
- UNITS:
- EACH
- INSIDE DIAMETER:
- 14 MM
- OUTSIDE DIAMETER METRIC:
- 18 MM
- TYPE:
- NEEDLE
- LENGTH:
- 16 MM
$11.50 -
MOOSE RACING Top End Gasket Kit - KX80 810406
MOOSE RACING
$26.31Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810406- SKU:
- M810406
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$26.31 -
MOOSE RACING Top End Gasket Kit - KX/RM60 810407
MOOSE RACING
$22.12Moose can now handle all your gasket and seal needs at a fraction of OEM cost, High-tech materials provide unmatched reliability and performance, Rebuild the engine and transmission with total confidence as each set is designed for durability and...M810407- SKU:
- M810407
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$22.12
