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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MOOSE RACING Motor Gasket Kit with Seal - RMX250 811578
MOOSE RACING
$90.04A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your wallet. This MOOSE RACING kit delivers OEM-equivalent quality at a fraction of the cost, letting you rebuild with confidence...M811578- SKU:
- M811578
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
- UNITS:
- KIT
$90.04 -
MOOSE RACING Complete Motor Gasket Kit - YZ250 808665
MOOSE RACING
$51.07A complete engine and transmission rebuild demands gasket and seal integrity—factory tolerances leave no room for compromise. This Moose Racing kit delivers OEM-equivalent reliability at a fraction of the cost, giving you confidence that every critical...M808665- SKU:
- M808665
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
$51.07 -
MOOSE RACING Complete Motor Gasket Kit - YZ250 808666
MOOSE RACING
$48.17A complete engine and transmission rebuild demands precision gasket and seal replacement—compromised sealing surfaces invite oil leaks, contamination, and catastrophic failure. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by bundling...M808666- SKU:
- M808666
- Availability:
- Ships Same Business Day
- Weight:
- 0.18 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$48.17 -
MOOSE RACING Top End Gasket Kit - YZ 80 810611
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, giving you the confidence to reassemble...M810611- SKU:
- M810611
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Top End Gasket Kit - YZ 80 810612
MOOSE RACING
$18.96A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, using high-tech materials engineered for...M810612- SKU:
- M810612
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Top End Gasket Kit - YZ 85 810614
MOOSE RACING
$24.35A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity or your wallet. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction of the cost, allowing you to confidently refresh your YZ...M810614- SKU:
- M810614
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$24.35 -
MOOSE RACING Motor Seals - CRF450 822989
MOOSE RACING
$59.35Engine seal degradation is inevitable—but catastrophic failure isn't. MOOSE RACING Motor Seals give you OEM-equivalent reliability at a fraction of the cost, so you can rebuild your CRF450 with confidence. This complete seal kit eliminates the guesswork...09350974- SKU:
- 09350974
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- ENGINE
- UNITS:
- SET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
$59.35 -
MOOSE RACING Complete Motor Gasket Kit 808372
MOOSE RACING
$127.66A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work. This MOOSE RACING kit eliminates the hassle of sourcing individual components, giving you every gasket, o-ring, and seal needed in one...09345878- SKU:
- 09345878
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- STREET
- TYPE:
- ENGINE
- TYPE:
- COMPLETE
$127.66 -
MOOSE RACING Motor Gasket Kit with Seal - RM125 811549
MOOSE RACING
$102.28A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your budget. This MOOSE RACING gasket kit eliminates the guesswork and expense of sourcing OEM components individually, giving you...M811549- SKU:
- M811549
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$102.28 -
MOOSE RACING Motor Gasket Kit with Seal - RM250 811574
MOOSE RACING
$80.18A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or your wallet. Moose Racing's motor gasket kit delivers OEM-quality components at a fraction of dealership pricing, so you can rebuild...M811574- SKU:
- M811574
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$80.18 -
MOOSE RACING Motor Gasket Kit with Seal - YZ80 811612
MOOSE RACING
$49.23A complete engine and transmission rebuild demands precision components that won't compromise your performance or reliability. MOOSE Racing's gasket and seal kit eliminates the guesswork of sourcing individual seals and gaskets, delivering genuine...M811612- SKU:
- M811612
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
$49.23 -
LA Sleeve Cylinder Rebuild Kit for 2000-2006 Honda TRX350TE FourTrax Rancher ES LAS-5443K
LA SLEEVE
$312.95When your Honda TRX350TE Rancher's top-end starts losing compression and efficiency, a quality rebuild kit is the most cost-effective way to restore original performance—or exceed it. The LA Sleeve Cylinder Rebuild Kit delivers a complete solution with a...09310356- SKU:
- 09310356
- Availability:
- Ships Same Business Day
- Weight:
- 3.50 LBS
- MATERIAL:
- IRON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- CYLINDER
- RIDING STYLE:
- ATV
- UNITS:
- KIT
$312.95 -
LA Sleeve Cylinder Sleeve 85mm Bore Honda TRX400FA 2004-2007 H5630
LA SLEEVE
$117.95A worn cylinder bore reduces compression, kills power output, and forces you to rebuild or replace the entire engine. The LA Sleeve H5630 restores your TRX400FA to factory specifications without the expense of a complete engine replacement. This...09310371- SKU:
- 09310371
- Availability:
- Ships Same Business Day
- Weight:
- 1.95 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- RS
- BORE SIZE METRIC:
- 85.00 MM
- COLOR/FINISH:
- ALUMINUM
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$117.95 -
MOOSE RACING Oil Pump Cover - KTM/Husky T04-5103B
MOOSE RACING
$32.95Protecting your engine's oil system while managing thermal stress is critical for sustained performance on the track or trail. The MOOSE RACING Oil Pump Cover replaces factory plastic components with precision-engineered aluminum that actively dissipates...09401938- SKU:
- 09401938
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- MATERIAL:
- 6061 T-6 ALUMINUM
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- MACHINED
- TYPE:
- OIL PUMP
- UNITS:
- EACH
$32.95 -
MOOSE RACING Motor Gasket Kit with Oil Seal - 50 Adventure A/C 811314
MOOSE RACING
$40.75A complete engine and transmission rebuild demands precision components that won't compromise reliability or drain your wallet. This MOOSE RACING Motor Gasket Kit delivers OEM-quality seals and gaskets at a fraction of dealership pricing, letting you...09340467- SKU:
- 09340467
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$40.75 -
MOOSE RACING Complete Gasket and Oil Seal Kit 811372
MOOSE RACING
$191.24A complete engine and transmission rebuild demands precision-fit gaskets and seals that won't compromise your work or force you to source components piecemeal. This kit eliminates guesswork by supplying all OEM-equivalent gaskets and oil seals in one...09345368- SKU:
- 09345368
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- TYPE:
- ENGINE
$191.24 -
MOOSE RACING Oil Filter DT-10-35
MOOSE RACING
$9.95Engine protection starts with filtration. The MOOSE RACING Oil Filter DT-10-35 delivers the micron-level particle capture your engine demands, safeguarding critical components from wear and contamination. Whether you're running conventional or synthetic...07120357- SKU:
- 07120357
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- MICRON RATING:
- 10 MICRONS
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- STANDARD
$9.95 -
On Sale
Wiseco Piston Kit 48.50mm for Suzuki RM85 2002-2023 806M04850
WISECO
MSRP: $119.95Now: $102.00Was: $119.95The Wiseco Piston Kit 806M04850 is engineered for RM85 riders who demand reliability through hard use. Whether you're rebuilding after a top-end failure or upgrading to OEM+ performance, this precision-machined piston delivers consistent power and...09101248- SKU:
- 09101248
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 48.50 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 84.7 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 46.80 MM
- UNITS:
- EACH
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
MSRP: $119.95Now: $102.00Was: $119.95 -
On Sale
Wiseco Piston Kit with Gaskets for Yamaha YFS200 Blaster 1988-2006 66.75mm PK1092
WISECO
MSRP: $204.95Now: $174.00Was: $204.95If your YFS200 Blaster is showing signs of wear—loss of compression, blow-by, or sluggish throttle response—a piston kit refresh is one of the most direct ways to restore power and reliability. Wiseco's forged pistons are engineered for the extreme...09030454- SKU:
- 09030454
- Availability:
- Ships Same Business Day
- Weight:
- 0.95 LBS
- BORE SIZE METRIC:
- 66.75 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 57.00 MM
- BORE - OVERSIZE:
- +0,75 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.75 MM
- DISPLACEMENT:
- 195 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- ATV
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 66.70 MM
- PRODUCT NAME:
- REBUILD KIT
MSRP: $204.95Now: $174.00Was: $204.95 -
SHINDY Needle Bearing - 18 mm x 22 mm x 22 mm 10-001
SHINDY
$9.95Piston pin needle bearings are critical to engine reliability, especially in high-RPM racing applications where precision tolerances and durability directly impact performance. This SHINDY bearing delivers the exact specifications needed for smooth,...NB1457- SKU:
- NB1457
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- LENGTH METRIC:
- 22 MM
- RIDING STYLE:
- UTV
- LENGTH:
- 22 MM
- PRODUCT NAME:
- BEARING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- INSIDE DIAMETER:
- 18 MM
- INSIDE DIAMETER METRIC:
- 18 MM
- OUTSIDE DIAMETER:
- 22 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 22 MM
- TYPE:
- NEEDLE
$9.95
