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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DEL WEST Exhaust Valve DW-RMZ450-EV08
DEL WEST
$155.95When you're pushing your RMZ450 to its limits in competition, valve reliability becomes non-negotiable. DEL WEST's exhaust valves are engineered to withstand the extreme thermal and mechanical stresses of off-road racing, giving you the durability and...09261063- 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-CRF150RIV07
DEL WEST
$155.95Off-road competition demands intake valves that won't compromise under extreme conditions. The DEL WEST Intake Valve DW-CRF150RIV07 delivers the reliability and precision tuning professionals expect, with a proven track record in high-stress racing...09262217- SKU:
- 09262217
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- TITANIUM
- UNITS:
- EACH
$155.95Qty in Cart: 0Quantity:Price:$155.95Subtotal: -
MOOSE RACING Oil Pump Cover - KTM/Husky T04-5101B
MOOSE RACING
$32.95Engine heat management directly impacts oil viscosity and overall engine longevity—especially in high-performance applications where stock components fall short. The MOOSE RACING Oil Pump Cover replaces that weak point with precision-engineered aluminum...09401936- 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
$31.95A quality oil cap isn't just a convenience—it's a critical safeguard against contamination and fluid loss under extreme engine conditions. The POWERSTANDS Racing Oil Cap Kit delivers CNC-precision engineering with heat-resistant materials built to handle...09500558- 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
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
POWERSTANDS RACING Oil Cap Kit - Orange - M24 x 3.0 00-01309-28
POWERSTANDS RACING
$31.95A quality oil cap isn't just a closure—it's a seal against contamination and heat loss that directly impacts engine longevity. The POWERSTANDS Racing Oil Cap Kit combines CNC-machined precision with race-proven engineering, delivering the durability and...09500559- 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
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
POWERSTANDS RACING Oil Cap Kit - Gold - M20 x 1.5 00-01310-23
POWERSTANDS RACING
$31.95A quality oil cap isn't just a seal—it's your first line of defense against leaks, contamination, and engine bay mess during hard driving. The POWERSTANDS Racing Oil Cap Kit combines CNC-precision engineering with thoughtful design details like...09500560- 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
$31.95Qty in Cart: 0Quantity:Price:$31.95Subtotal: -
Pro Filter Oil Filter for 2006-2009 Aprilia RXV 450 PF-563
PRO FILTER
$7.99Keep your RXV 450's engine running clean and protected with the Pro Filter PF-563—engineered to exceed OEM specifications for superior dirt removal and consistent flow rates. A quality oil filter is non-negotiable for engine longevity, especially in...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
$618.95When a two-stroke engine reaches the end of its service life, a quality rebuild kit is the most cost-effective way to restore full performance and reliability. The Wrench Rabbit Engine Rebuild Kit for Suzuki RM85 (2002-2004) gives you OEM-grade...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
$618.95 -
Wrench Rabbit Suzuki RM85 2005-2020 Engine Rebuild Kit WR101-069
WRENCH RABBIT
$618.95Two-stroke engines demand precision rebuilds to maintain peak performance and reliability. The Wrench Rabbit Suzuki RM85 Engine Rebuild Kit delivers all the critical components you need in one complete package, eliminating guesswork and compatibility...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
$618.95 -
XCELDYNE Valve Locks XLOM55761
XCELDYNE
$38.18Valve locks are critical to high-RPM engine stability—inadequate retention leads to catastrophic valve float and potential internal damage. The XCELDYNE XLOM55761 addresses this with purpose-engineered geometry and premium materials designed to maintain...09260529- 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
$52.06Reducing valve train mass is one of the most direct ways to push your engine's RPM ceiling higher while maintaining reliability. These CNC-machined titanium retainers cut weight compared to stock steel alternatives, directly translating to faster valve...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
$12.95Piston pin needle bearings are critical to maintaining precise crankshaft-to-connecting rod articulation, directly impacting engine reliability and performance consistency. Worn or damaged needle bearings introduce unwanted play that degrades power...NB1453- 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
$12.95 -
SHINDY Needle Bearing - 14 mm x 18 mm x 16 mm 10-054
SHINDY
$11.95Piston pin needle bearings are critical to engine reliability, especially in high-RPM applications where precision fit and smooth operation directly impact performance and longevity. The SHINDY 10-054 delivers the exact tolerances your engine demands—a...NB1461- 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
$11.95 -
MOOSE RACING Top End Gasket Kit - KX80 810406
MOOSE RACING
$27.72A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of OEM pricing, letting you refresh your KX80...M810406- SKU:
- M810406
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$27.72Qty in Cart: 0Quantity:Price:$27.72Subtotal: -
MOOSE RACING Top End Gasket Kit - KX/RM60 810407
MOOSE RACING
$23.33A top-end rebuild demands precision gaskets and seals—failure here means lost compression, oil weeping, and compromised performance. The MOOSE RACING Top End Gasket Kit gives you OEM-quality replacement seals at a fraction of factory cost, with every...M810407- SKU:
- M810407
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$23.33 -
MOOSE RACING Top End Gasket Kit - KE 100 810408
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise engine integrity or cost you a fortune. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent reliability at a fraction of the price, with every component you need to...M810408- SKU:
- M810408
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51 -
MOOSE RACING Top End Gasket Kit - KX 100 810409
MOOSE RACING
$33.51A top-end rebuild demands precision gaskets and seals that won't compromise performance or reliability. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of dealer pricing, so you can confidently refresh your KX 100's...M810409- SKU:
- M810409
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$33.51 -
MOOSE RACING Top End Gasket Kit - KX 80 810410
MOOSE RACING
$24.85Whether you're rebuilding after a piston replacement or maintaining peak compression, this gasket kit eliminates the guesswork and cost of sourcing individual seals and gaskets. Moose Racing delivers OEM-equivalent reliability at a fraction of the price,...M810410- SKU:
- M810410
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$24.85 -
MOOSE RACING Top End Gasket Kit - KX/RM100 810411
MOOSE RACING
$37.29When you're rebuilding a top end, every gasket and seal matters—cheap compromises lead to oil leaks, compression loss, and catastrophic failures. The MOOSE RACING Top End Gasket Kit gives you OEM-quality seals at a fraction of the cost, with U.S.A.-made...M810411- SKU:
- M810411
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$37.29 -
MOOSE RACING Clutch Cover Gasket 817988
MOOSE RACING
$13.64A leaking clutch cover gasket compromises engine sealing and can lead to oil loss and contamination. The MOOSE RACING Clutch Cover Gasket 817988 delivers OEM-equivalent sealing performance at a fraction of OEM pricing, using high-tech materials...09345899- SKU:
- 09345899
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$13.64
