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
-
MOOSE RACING Cylinder - Standard MSE40004
MOOSE RACING
$414.95A worn or damaged cylinder compromises compression, increases blowby, and degrades engine efficiency. The MOOSE RACING MSE40004 restores your engine to OEM performance specifications with a precision-machined bore and low-friction surface that dissipates...09310463- SKU:
- 09310463
- Availability:
- Ships Same Business Day
- Weight:
- 2.56 LBS
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$414.95Qty in Cart: 0Quantity:Price:$414.95Subtotal: -
MOOSE RACING Magnetic Drain Plug DP126
MOOSE RACING
$23.95Engine wear doesn't happen all at once—it starts with microscopic metal particles circulating through your oil. The MOOSE RACING Magnetic Drain Plug DP126 captures ferrous debris before it causes cumulative damage to bearings, piston rings, and valve...09200053- SKU:
- 09200053
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- FEATURES:
- MAGNETIC
- MATERIAL:
- 7075 ALUMINUM
- COLOR/FINISH:
- RED
- DIAMETER - THREAD SIZE METRIC:
- M16 X 1.50 X 19 MM
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
$23.95 -
MOOSE RACING Magnetic Drain Plug 33-DP106
MOOSE RACING
$19.95Engine wear debris circulates through your oil until it settles in critical passages—and that's where expensive damage begins. The MOOSE RACING Magnetic Drain Plug intercepts ferrous metal particles before they accumulate, extending engine life and...09200005- SKU:
- 09200005
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- COLOR/FINISH:
- SILVER
- DIAMETER - THREAD SIZE METRIC:
- M10 X 1.25
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FEATURES:
- MAGNETIC
- TYPE:
- DRAIN
$19.95Qty in Cart: 0Quantity:Price:$19.95Subtotal: -
MOOSE RACING Circlip MSE72047K
MOOSE RACING
$2.57A quality circlip is essential for maintaining secure shaft retention in high-performance applications where vibration and lateral forces demand absolute reliability. The MOOSE RACING MSE72047K delivers precision engineering that prevents costly...09130303- SKU:
- 09130303
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- SET
- PRODUCT NAME:
- CIRCLIP
$2.57Qty in Cart: 0Quantity:Price:$2.57Subtotal: -
MOOSE RACING Valve Shim Kit - 7.48 mm MSEHCSHIM01
MOOSE RACING
$127.95Proper valve shim selection is critical to maintaining accurate valve clearances and preventing costly engine damage. This complete MOOSE RACING kit eliminates guesswork during valve train service by providing precision-engineered shims with clear...09261827- SKU:
- 09261827
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM KIT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$127.95Qty in Cart: 0Quantity:Price:$127.95Subtotal: -
MOOSE RACING Valve Shim - 10.0 x 1.90 - 5 pack MSE5PK1000190
MOOSE RACING
$10.95Proper valve shim selection is critical for maintaining accurate valve clearances, which directly impacts engine performance, fuel efficiency, and longevity. If your valve train clearances drift out of spec, you'll face compromised combustion timing and...09261831- SKU:
- 09261831
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.90 MM
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 1.95 - 5 pack MSE5PK1000195
MOOSE RACING
$10.95Precision valve shim adjustment is essential for maintaining optimal valve clearance and preventing costly engine damage. This 5-pack of MOOSE Racing shims gives you the exact sizes you need for quick, accurate valve train maintenance without the expense...09261832- SKU:
- 09261832
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- VALVE SHIM THICKNESS METRIC:
- 1.95 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Valve Shim - 10.0 x 2.00 - 5 pack MSE5PK1000200
MOOSE RACING
$10.95Proper valve shim selection is critical for maintaining correct valve clearance and preventing premature wear on your cylinder head. These MOOSE Racing shims are precision-forged from 4140 cold rolled steel—not sintered—ensuring consistent hardness and...09261833- SKU:
- 09261833
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 2.10 - 5 pack MSE5PK1000210
MOOSE RACING
$10.95Proper valve clearance is critical to engine performance and longevity—even small deviations can cause timing issues, compression loss, or valve damage. MOOSE RACING valve shims give you precision control over your valve train adjustment, and this 5-pack...09261835- SKU:
- 09261835
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.10 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 1.90 - 5 pack MSE5PK748190
MOOSE RACING
$9.95Valve shim maintenance is non-negotiable for precision engine work, and having the correct sizes on hand eliminates downtime between builds. These MOOSE Racing shims are forged from 4140 cold rolled steel—a material choice that matters—ensuring...09261872- SKU:
- 09261872
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 1.90 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 1.95 - 5 pack MSE5PK748195
MOOSE RACING
$9.95Precision valve train maintenance requires reliable, accurately-sized shims—and guesswork has no place in your engine bay. These MOOSE RACING valve shims are forged from 4140 cold rolled steel for durability that outlasts sintered alternatives, while...09261873- SKU:
- 09261873
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.95 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.00 - 5 pack MSE5PK748200
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity, and having the right shims on hand eliminates guesswork during valve train adjustments. These forged 4140 steel shims are built to withstand repeated adjustments...09261874- SKU:
- 09261874
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.00 MM
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 2.20 - 5 pack MSE5PK748220
MOOSE RACING
$9.95Precise valve shim selection is non-negotiable when dialing in your valve train clearances—even a tenth of a millimeter affects cam timing and engine performance. This 5-pack of MOOSE RACING shims gives you multiple sizes on hand so you can achieve exact...09261878- SKU:
- 09261878
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.20 MM
- MATERIAL:
- ROLLED
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- UTV
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.35 - 5 pack MSE5PK748235
MOOSE RACING
$9.95Maintaining precise valve clearances is critical to engine performance and longevity—and having the right shims on hand eliminates guesswork and downtime during valve train adjustments. MOOSE Racing valve shims are forged from 4140 cold-rolled steel,...09261881- SKU:
- 09261881
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.35 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 2.70 - 5 pack MSE5PK748270
MOOSE RACING
$9.95Precision valve train maintenance demands reliable shims that won't degrade under thermal cycling or high-RPM loads. These MOOSE Racing shims eliminate guesswork during valve lash adjustment, ensuring consistent clearances that maximize power delivery...09261888- SKU:
- 09261888
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.70 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 2.75 - 5 pack MSE5PK748275
MOOSE RACING
$9.95Maintaining proper valve clearances is critical to engine performance and longevity, and having precision shims on hand ensures you can make adjustments quickly without hunting for the right size. These MOOSE RACING valve shims are forged from 4140...09261889- SKU:
- 09261889
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.75 MM
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 3.30 - 5 pack MSE5PK748330
MOOSE RACING
$9.95Precision valve train maintenance demands accurate shims, and guesswork has no place in your engine bay. These MOOSE RACING valve shims eliminate the frustration of unmarked components by featuring laser-etched sizing for quick identification during...09261900- SKU:
- 09261900
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.30 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 7.48 x 3.40 - 5 pack MSE5PK748340
MOOSE RACING
$9.95Proper valve train geometry is non-negotiable for engine reliability and performance—especially during frequent adjustments or rebuilds. These MOOSE RACING valve shims eliminate guesswork with precision-forged construction and laser-etched...09261902- SKU:
- 09261902
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.40 MM
$9.95 -
MOOSE RACING Valve Shim - 7.48 x 3.45 - 5 pack MSE5PK748345
MOOSE RACING
$9.95Proper valve clearance is critical to engine longevity and performance—too tight and you risk burned valves, too loose and you lose power and increase wear. MOOSE RACING valve shims give you precise control over your valve train with reliable, forged...09261903- SKU:
- 09261903
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- VALVE SHIM THICKNESS METRIC:
- 3.45 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
MOOSE RACING Valve Shim - 8.90 x 1.76 - 5 pack MSE5PK890176
MOOSE RACING
$10.95Precision valve train maintenance demands accurate, durable shims that won't let you down during critical tuning. These forged 4140 steel shims eliminate the guesswork of valve lash adjustment with laser-etched identification, so you spend less time...09261906- SKU:
- 09261906
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- MATERIAL:
- ROLLED
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.76 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$10.95
