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 Top End Gasket Kit - RM 80 810502
MOOSE RACING
$21.90A quality 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 eliminates the guesswork and expense of sourcing individual components, giving you every seal...M810502- SKU:
- M810502
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$21.90 -
MOOSE RACING Top End Gasket Kit - RM 80 810504
MOOSE RACING
$18.96A top-end rebuild demands precision and reliability—this gasket kit delivers both without the OEM price tag. Moose Racing engineered every seal and gasket to exact specifications, so you can confidently reassemble your engine knowing each component is...M810504- SKU:
- M810504
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$18.96 -
MOOSE RACING Top End Gasket Kit - RM 85 810505
MOOSE RACING
$21.90A 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-quality components at a fraction of the price, letting you refresh your RM 85 with...M810505- SKU:
- M810505
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$21.90 -
MOOSE RACING Top End Gasket Kit - RM 125 810542
MOOSE RACING
$26.26When you're rebuilding a top end, you need gaskets and seals you can trust to hold up under boost and heat. The MOOSE RACING Top End Gasket Kit delivers OEM-equivalent quality at a fraction of the cost, letting you spend your budget where it counts—on...M810542- SKU:
- M810542
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$26.26 -
MOOSE RACING Top End Gasket Kit - RM 125 810543
MOOSE RACING
$29.14A top-end rebuild demands precision gaskets and seals that won't let you down mid-season. The MOOSE RACING Top End Gasket Kit eliminates guesswork by including every component you need for a complete, reliable engine refresh—all manufactured domestically...M810543- SKU:
- M810543
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$29.14 -
MOOSE RACING Motor Gasket Kit with Seal - XR400 811266
MOOSE RACING
$112.56A complete engine and transmission rebuild requires precision-fit gaskets and seals that won't compromise your work. MOOSE Racing delivers OEM-equivalent quality at a fraction of the cost, with every component engineered for accurate fit and long-term...M811266- SKU:
- M811266
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$112.56 -
MOOSE RACING Motor Gasket Kit with Seal - CR500 811273
MOOSE RACING
$83.52A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your CR500's integrity or reliability. OEM replacement parts command premium prices, but this Moose Racing kit delivers genuine-quality components at a...M811273- SKU:
- M811273
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$83.52 -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811420
MOOSE RACING
$66.13A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work. MOOSE Racing delivers OEM-quality replacement seals at a fraction of the cost, so you can rebuild with confidence without sacrificing...M811420- SKU:
- M811420
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$66.13 -
MOOSE RACING Motor Gasket Kit with Seal - KX125 811424
MOOSE RACING
$70.33Engine and transmission rebuilds demand precision—using substandard gaskets and seals invites leaks, performance loss, and costly failures down the line. This Moose Racing Motor Gasket Kit delivers OEM-quality components at a fraction of OEM pricing,...M811424- SKU:
- M811424
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
$70.33 -
MOOSE RACING Top End Gasket Kit - KLX 810460
MOOSE RACING
$36.47A top-end rebuild demands precision—and cutting corners on gaskets and seals invites leaks, compression loss, and premature failure. The MOOSE RACING Top End Gasket Kit delivers every component you need for a complete, reliable rebuild at a fraction of...09346109- SKU:
- 09346109
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- TYPE:
- TOP END
$36.47 -
MOOSE RACING Top End Gasket Kit - YZ450F 810997
MOOSE RACING
$87.72A top-end rebuild demands gaskets and seals that match OEM precision without the OEM price tag. The MOOSE RACING Top End Gasket Kit delivers U.S.-manufactured components engineered for reliability and accurate fitment, so you can confidently reassemble...09346110- SKU:
- 09346110
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- GASKET
$87.72 -
MOOSE RACING Complete Motor Gasket Kit with Seals - Suzuki 811983
MOOSE RACING
$182.97A complete engine and transmission rebuild demands precision-fit gaskets and seals—factory OEM replacements that won't compromise your work. The MOOSE RACING Complete Motor Gasket Kit eliminates the tedious sourcing of individual components while...09346112- SKU:
- 09346112
- Availability:
- Ships Same Business Day
- Weight:
- 0.51 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- TYPE:
- ENGINE
- PRODUCT NAME:
- GASKET
$182.97 -
MOOSE RACING Complete Motor Gasket Kit with Seals - Yamaha 811997
MOOSE RACING
$172.74A complete engine rebuild requires precision gaskets and seals that maintain proper compression and prevent fluid leakage—compromises here lead to performance loss and costly damage. The MOOSE RACING Complete Motor Gasket Kit eliminates guesswork by...09346113- SKU:
- 09346113
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- ENGINE
$172.74 -
MOOSE RACING Magnetic Drain Plug T14-2082S
MOOSE RACING
$17.95Engine wear begins the moment oil circulates, carrying ferrous particles that accumulate over thousands of miles. The MOOSE RACING Magnetic Drain Plug T14-2082S captures these metal filings before they circulate back through your engine, extending...09200194- SKU:
- 09200194
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- ANODIZED CLEAR
- DIAMETER - THREAD SIZE METRIC:
- M10 X 1.5 X 22 MM
- FEATURES:
- MAGNETIC
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
- UNITS:
- EACH
$17.95 -
MOOSE RACING Motor Gasket Kit with Seal - CR125 811235
MOOSE RACING
$74.29A complete engine and transmission rebuild demands gaskets and seals that fit precisely and hold up under load—and OEM replacements can drain your budget fast. This Moose Racing Motor Gasket Kit delivers genuine OEM-quality seals at a fraction of the...M811235- SKU:
- M811235
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
- TYPE:
- COMPLETE
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$74.29 -
MOOSE RACING Top End Gasket Kit - XL/XR250 810258
MOOSE RACING
$80.32When you're rebuilding a top end, every gasket and seal matters—factory tolerances demand precision, and substandard materials lead to leaks, compression loss, and catastrophic failure. The MOOSE RACING Top End Gasket Kit gives you OEM-quality seals at a...M810258- SKU:
- M810258
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$80.32 -
MOOSE RACING Top End Gasket Kit - CR250R 810259
MOOSE RACING
$41.54When you're rebuilding a CR250R top end, using a complete OEM-quality gasket kit eliminates guesswork and ensures proper sealing from the first fire-up. The MOOSE RACING Top End Gasket Kit gives you every seal and gasket needed for a professional rebuild...M810259- SKU:
- M810259
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$41.54 -
LA Sleeve Cylinder Sleeve 54mm Bore Suzuki RM125 2004-2007 FL5532
LA SLEEVE
$127.95When your RM125's cylinder shows signs of wear—scoring, pitting, or loss of compression—a quality sleeve restores your engine to factory spec without requiring a complete cylinder replacement. The LA SLEEVE FL5532 is precision-engineered for the...09310040- SKU:
- 09310040
- Availability:
- Ships Same Business Day
- Weight:
- 0.61 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CYLINDER SLEEVE
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
$127.95 -
LA Sleeve Cylinder Sleeve 45mm Bore 2003-2008 KTM 65 SX FL5550
LA SLEEVE
$117.95A worn or damaged cylinder sleeve compromises compression, reduces power output, and accelerates further engine wear—ultimately shortening your 2003-2008 KTM 65 SX's lifespan. The LA SLEEVE FL5550 restores your engine to factory compression standards,...09310042- SKU:
- 09310042
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 45.00 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$117.95 -
LA Sleeve Cylinder Sleeve 54mm Bore Honda CR125R 1987-1988 H5001
LA SLEEVE
$137.95A worn cylinder sleeve compromises compression, sealing, and overall engine reliability—critical issues in competitive two-stroke racing where every horsepower and consistency matters. The LA SLEEVE H5001 is a precision-engineered replacement that...09310047- SKU:
- 09310047
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CS
- BORE SIZE METRIC:
- 54.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$137.95
