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 Inner Clutch Cover Gasket 816027
MOOSE RACING
$13.18A leaking clutch cover gasket compromises both engine integrity and performance reliability. The MOOSE RACING Inner Clutch Cover Gasket (816027) delivers OEM-equivalent sealing in a cost-effective...09346117- SKU:
- 09346117
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- TYPE:
- CLUTCH COVER
$13.18 -
MOOSE RACING Inner Clutch Cover Gasket 816039
MOOSE RACING
$16.40A leaking inner clutch cover gasket compromises engine sealing and invites oil contamination into critical drivetrain components. MOOSE Racing's OEM-equivalent gasket delivers precise fitment and...09346118- SKU:
- 09346118
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
$16.40 -
MOOSE RACING Inner Clutch Cover Gasket 816068
MOOSE RACING
$13.91A leaking clutch cover gasket will compromise oil containment and create a mess in your engine bay—exactly what you don't need during a rebuild or mid-season maintenance. The MOOSE RACING Inner...09346119- SKU:
- 09346119
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- UNITS:
- EACH
- PRODUCT NAME:
- GASKET
$13.91 -
MOOSE RACING Inner Clutch Cover Gasket 816084
MOOSE RACING
$13.64A leaking clutch cover doesn't just waste oil—it compromises engine sealing integrity and invites contamination into your drivetrain. The MOOSE RACING Inner Clutch Cover Gasket (816084) delivers a...09346120- SKU:
- 09346120
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
$13.64 -
MOOSE RACING Magnetic Drain Plug T14-6084S
MOOSE RACING
$17.95Metal particles circulating through your engine accelerate wear on critical components—a problem a standard drain plug simply ignores. The MOOSE RACING Magnetic Drain Plug captures ferrous debris...09200189- SKU:
- 09200189
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- DIAMETER - THREAD SIZE METRIC:
- M8 X 1.25 X 20 MM
- COLOR/FINISH:
- ANODIZED CLEAR
- FEATURES:
- MAGNETIC
- TYPE:
- DRAIN
- COLOR/FINISH:
- SILVER
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$17.95 -
MOOSE RACING Magnetic Drain Plug T14-1081S
MOOSE RACING
$17.95Metal filings accumulate in your engine oil during normal operation, accelerating wear on critical components and shortening engine life. A magnetic drain plug intercepts these ferrous particles...09200190- SKU:
- 09200190
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- DIAMETER - THREAD SIZE METRIC:
- M8 X 1.25 X 25 MM
- COLOR/FINISH:
- SILVER
- FEATURES:
- MAGNETIC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
- COLOR/FINISH:
- ANODIZED CLEAR
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
$17.95 -
MOOSE RACING Magnetic Drain Plug T14-1082S
MOOSE RACING
$17.95Engine wear doesn't announce itself—metal filings circulate silently through your oil until catastrophic damage occurs. The MOOSE RACING Magnetic Drain Plug T14-1082S captures ferrous particles...09200191- SKU:
- 09200191
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- COLOR/FINISH:
- ANODIZED CLEAR
- FEATURES:
- MAGNETIC
- DIAMETER - THREAD SIZE METRIC:
- M8 X 1.25 X 33 MM
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
- COLOR/FINISH:
- SILVER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
$17.95 -
MOOSE RACING Top End Gasket Kit - XR100 810221
MOOSE RACING
$24.85A top-end rebuild demands precision and reliability—this Moose Racing gasket kit delivers both at a fraction of OEM pricing. Whether you're replacing a worn piston or performing routine maintenance,...M810221- SKU:
- M810221
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$24.85 -
MOOSE RACING Top End Gasket Kit - CR125R 810231
MOOSE RACING
$39.34A top-end rebuild demands precision gaskets and seals that won't compromise your engine's integrity—and Moose Racing delivers OEM-quality components at a fraction of OEM pricing. This complete gasket...M810231- SKU:
- M810231
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$39.34Qty in Cart: 0Quantity:Price:$39.34Subtotal: -
MOOSE RACING Top End Gasket Kit - CR125R 810232
MOOSE RACING
$23.33A top-end rebuild demands precision gaskets and seals that won't fail under race conditions or repeated heat cycles. This Moose Racing kit eliminates the guesswork by including every component you...M810232- SKU:
- M810232
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- TYPE:
- TOP END
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$23.33 -
MOOSE RACING Top End Gasket Kit - CR125R 810233
MOOSE RACING
$42.36When you're rebuilding a CR125R top end, gasket failure isn't an option—it compromises compression, invites oil leakage, and can sideline your bike mid-season. The MOOSE RACING Top End Gasket Kit...M810233- SKU:
- M810233
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$42.36 -
MOOSE RACING Top End Gasket Kit - CR125 810235
MOOSE RACING
$37.29A top-end rebuild demands precision components that won't compromise reliability or performance. The MOOSE RACING Gasket Kit delivers OEM-quality seals at a fraction of the cost, giving you complete...M810235- SKU:
- M810235
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$37.29 -
MOOSE RACING Top End Gasket Kit - CR250 810251
MOOSE RACING
$17.46A top-end rebuild demands precision gaskets and seals that match OEM specifications without the premium OEM price tag. The MOOSE RACING gasket kit delivers complete coverage for CR250 rebuilds—every...M810251- SKU:
- M810251
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$17.46 -
MOOSE RACING Top End Gasket Kit - CR250R 810252
MOOSE RACING
$21.90When you're rebuilding a CR250R top end, gasket failure isn't an option. This Moose Racing kit eliminates the guesswork by delivering every seal, O-ring, and gasket you need in one package—all...M810252- SKU:
- M810252
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$21.90 -
MOOSE RACING Top End Gasket Kit - CR250R 810253
MOOSE RACING
$23.33A top-end rebuild demands precision and reliability—cutting corners on gaskets and seals will cost you on track or trail. This Moose Racing kit eliminates the guesswork by bundling every gasket,...M810253- SKU:
- M810253
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$23.33 -
LA Sleeve Cylinder Sleeve for Suzuki LT250R 1988-1992 FL5064
LA SLEEVE
$148.95When cylinder wear compromises compression and power delivery, a quality sleeve restoration becomes essential for reliable performance. The LA SLEEVE FL5064 restores your Suzuki LT250R's original...FL5064- SKU:
- FL5064
- Availability:
- Ships Same Business Day
- Weight:
- 2.19 LBS
- BORE SIZE METRIC:
- 67.00 MM
- COLOR/FINISH:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER SLEEVE
- TYPE:
- CS
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$148.95Qty in Cart: 0Quantity:Price:$148.95Subtotal: -
LA Sleeve Cylinder Sleeve 1989-1990 Suzuki RM250 RMX250 67mm Bore FL5093
LA SLEEVE
$153.95If you're rebuilding a 1989-1990 RM250 or RMX250, a worn cylinder is the bottleneck preventing peak performance. The LA SLEEVE FL5093 restores compression and sealing integrity, giving you the...FL5093- SKU:
- FL5093
- Availability:
- Ships Same Business Day
- Weight:
- 1.31 LBS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- BORE SIZE METRIC:
- 67.00 MM
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
$153.95 -
L.A. Sleeve Cylinder Sleeve 47.50mm Bore Suzuki RM80 1991-2001 FL5140
LA SLEEVE
$117.95A worn cylinder sleeve compromises compression, increases blow-by, and robs your RM80 of power and efficiency. The L.A. Sleeve FL5140 restores your engine to factory specifications with a...FL5140- SKU:
- FL5140
- Availability:
- Ships Same Business Day
- Weight:
- 0.88 LBS
- BORE SIZE METRIC:
- 47.50 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CS
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
$117.95 -
L.A. Sleeve Cylinder Sleeve for Suzuki RM-250 1991-1993 FL5182
LA SLEEVE
$153.95A worn cylinder wall compromises combustion efficiency, power output, and fuel economy—problems that multiply quickly in a high-revving two-stroke like the RM-250. The L.A. Sleeve FL5182 restores...FL5182- SKU:
- FL5182
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- CYLINDER BORE COATING:
- CHROME-MOLY ALLOY
- TYPE:
- AC
- BORE SIZE METRIC:
- 67.00 MM
- PRODUCT NAME:
- CYLINDER SLEEVE
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- CHROME
- UNITS:
- EACH
$153.95Qty in Cart: 0Quantity:Price:$153.95Subtotal: -
LA Sleeve Sleeve and Piston Kit Kawasaki KX85 2014-2019 LAS5778K
LA SLEEVE
$326.95When your Kawasaki KX85 starts losing compression and power, a worn top-end compromises both reliability and lap times. The LA Sleeve Sleeve and Piston Kit restores your engine to peak efficiency...09310861- SKU:
- 09310861
- Availability:
- Ships Same Business Day
- Weight:
- 1.65 LBS
- PRODUCT NAME:
- SLEEVE AND PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$326.95Qty in Cart: 0Quantity:Price:$326.95Subtotal:
