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 816020
MOOSE RACING
$14.33A failing clutch cover gasket can compromise your engine's oil containment and lead to costly sealing failures during critical race conditions. The MOOSE RACING Inner Clutch Cover Gasket delivers OEM-equivalent reliability at a fraction of OEM pricing,...09346116- SKU:
- 09346116
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- GASKET
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CLUTCH COVER
$14.33 -
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 package, using high-tech materials engineered for...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 reliable sealing without the premium price tag of genuine...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 Clutch Cover Gasket 816068 delivers genuine OEM-quality...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 precision fit that stops seepage at the source, using...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 before it can damage bearings, cylinders, and valve...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 before they circulate through your engine, protecting...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 before they cause bearing wear, ring scoring, or complete...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, you get every seal, gasket, and O-ring needed for a...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 kit includes everything needed for a full top-end...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 need—valve seals, head gasket, base gasket, exhaust...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 eliminates guesswork by delivering every seal, O-ring, and...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 confidence when reassembling your CR125 after a piston...M810235- SKU:
- M810235
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$37.29Qty in Cart: 0Quantity:Price:$37.29Subtotal: -
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 gasket, O-ring, and seal you need in one package,...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 manufactured to precise tolerances and backed by proven...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, O-ring, and seal you need for a complete CR250R top-end...M810253- SKU:
- M810253
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$23.33Qty in Cart: 0Quantity:Price:$23.33Subtotal: -
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 bore dimensions, eliminating blow-by and revitalizing...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 reliability needed for serious riding or racing. This...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 precision-engineered replacement that handles the demands of trail...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 your cylinder to factory specifications, eliminating...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:
