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 Ignition Cover - Kawasaki D70-2472MB
MOOSE RACING
$244.95The stock ignition cover on your Kawasaki can't match the thermal management and structural integrity of aircraft-grade aluminum. This MOOSE Racing cover dissipates heat more effectively than OEM...09401944- SKU:
- 09401944
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- PRODUCT NAME:
- COVER
- BASE COLOR:
- BLACK
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- UNITS:
- EACH
- MATERIAL:
- ALUMINUM
$244.95Qty in Cart: 0Quantity:Price:$244.95Subtotal: -
MOOSE RACING Water Pump Cover - Black - KTM/Husqvarna I04-5251B
MOOSE RACING
$88.95Stock water pump covers on KTM and Husqvarna machines are vulnerable to impact damage and corrosion—especially in aggressive riding conditions. The MOOSE RACING Water Pump Cover replaces that weak...09401930- SKU:
- 09401930
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- UNITS:
- EACH
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
$88.95 -
MOOSE RACING Water Pump Cover - Black - KTM/Husqvarna I04-5252B
MOOSE RACING
$110.95Stock water pump covers on KTM and Husqvarna dirt bikes are cast aluminum—durable enough for street duty, but vulnerable to impact damage on the trail or track. The MOOSE RACING Water Pump Cover...09401931- SKU:
- 09401931
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- WATER PUMP
- PRODUCT NAME:
- COVER
- RIDING STYLE:
- STREET
- UNITS:
- EACH
$110.95 -
MOOSE RACING Water Pump Cover - Black - KTM/Husqvarna I04-5256B
MOOSE RACING
$84.95The stock cast water pump cover on your KTM or Husqvarna is vulnerable to impact damage and corrosion—especially if you're running hard in challenging terrain. The MOOSE RACING Water Pump Cover...09401932- SKU:
- 09401932
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- MATERIAL:
- BILLET ALUMINUM
- PRODUCT NAME:
- COVER
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- TYPE:
- WATER PUMP
$84.95 -
MOOSE RACING Top End Gasket Kit - RM 80 810500
MOOSE RACING
$17.46A top-end rebuild demands precision gaskets and seals that won't fail under combustion pressure or thermal cycling. The MOOSE RACING Top End Gasket Kit delivers OEM-quality components at a fraction...M810500- SKU:
- M810500
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- TYPE:
- TOP END
$17.46Qty in Cart: 0Quantity:Price:$17.46Subtotal: -
MOOSE RACING Top End Gasket Kit - RM 80 810501
MOOSE RACING
$18.96A top-end rebuild demands precision-fit gaskets and seals that won't compromise your engine's integrity or performance. The MOOSE RACING Top End Gasket Kit delivers OEM-quality replacement seals at a...M810501- SKU:
- M810501
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$18.96 -
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...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...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...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 810540
MOOSE RACING
$17.46A quality top-end gasket kit is essential when rebuilding your RM 125—it seals combustion chambers, prevents oil leakage, and ensures your freshly rebuilt engine performs reliably from day one. Moose...M810540- SKU:
- M810540
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$17.46Qty in Cart: 0Quantity:Price:$17.46Subtotal: -
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...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...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 811265
MOOSE RACING
$120.99A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise on fitment or durability. MOOSE Racing delivers OEM-quality replacement seals at a fraction of the...M811265- SKU:
- M811265
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- PRODUCT NAME:
- GASKET
- UNITS:
- KIT
$120.99Qty in Cart: 0Quantity:Price:$120.99Subtotal: -
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...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...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 - XR600 811280
MOOSE RACING
$122.00A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise your work—OEM-spec components at a fraction of dealership pricing. This Moose Racing kit...M811280- SKU:
- M811280
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- COMPLETE
- UNITS:
- KIT
- PRODUCT NAME:
- GASKET
$122.00Qty in Cart: 0Quantity:Price:$122.00Subtotal: -
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...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...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...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...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
