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 Intake Valve Kit M80-82350
MOOSE RACING
$196.95OEM titanium intake valves wear out and require frequent replacement—stainless steel conversion eliminates that cycle. The MOOSE RACING Black Diamond intake valves extend valve train life by up to 4x while delivering superior flow characteristics and...09263192- SKU:
- 09263192
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- UNITS:
- KIT
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
$196.95 -
MOOSE RACING Exhaust Valve Kit M30-33690
MOOSE RACING
$169.95Your intake valves are the gatekeepers of cylinder filling—and factory titanium components simply don't last through serious competition or high-mileage abuse. The MOOSE RACING Exhaust Valve Kit M30-33690 upgrades your cylinder head to stainless steel...09263304- SKU:
- 09263304
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
$169.95 -
MOOSE RACING Cylinder - Standard MSE30001
MOOSE RACING
$380.95A worn or damaged cylinder compromises compression, increases friction, and accelerates wear on your piston rings and bearings. The MOOSE RACING MSE30001 restores OEM-spec performance with a durable, precision-machined replacement that dissipates heat...09310456- SKU:
- 09310456
- Availability:
- Ships Same Business Day
- Weight:
- 2.48 LBS
- MATERIAL:
- ALUMINUM
- MATERIAL:
- CAST
- UNITS:
- EACH
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$380.95 -
MOOSE RACING Cylinder - Standard MSE30006
MOOSE RACING
$390.95A worn or damaged cylinder compromises compression, throttle response, and overall engine reliability—especially under racing conditions where tolerances matter. The MOOSE RACING MSE30006 replaces your OEM cylinder with precision-engineered durability,...09310459- SKU:
- 09310459
- Availability:
- Ships Same Business Day
- Weight:
- 2.51 LBS
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- CAST
- PRODUCT NAME:
- CYLINDER
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- UNITS:
- EACH
$390.95 -
MOOSE RACING Cylinder - Standard MSE40001
MOOSE RACING
$407.95A worn or damaged cylinder is a bottleneck that compromises your entire engine's performance and reliability. The MOOSE RACING MSE40001 restores your engine to factory specifications with precision engineering and premium materials, giving you the...09310460- SKU:
- 09310460
- Availability:
- Ships Same Business Day
- Weight:
- 3.84 LBS
- UNITS:
- EACH
- ENGINE TYPE:
- 4-CYCLE
- MATERIAL:
- CAST
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- CYLINDER BORE COATING:
- NICKEL-SILICON CARBIDE
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- CYLINDER
- RIDING STYLE:
- OFF-ROAD
$407.95 -
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 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 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 - 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 2.20 - 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 2.75 - 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 3.40 - 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 - 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 -
MOOSE RACING Valve Shim - 8.90 x 1.84 - 5 pack MSE5PK890184
MOOSE RACING
$10.95Proper valve clearance is critical to engine performance and longevity—even a few thousandths of an inch off can hurt compression, increase valve train noise, and accelerate wear. The MOOSE RACING 8.90 x 1.84 valve shim kit eliminates guesswork during...09261908- SKU:
- 09261908
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 1.84 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 8.90 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$10.95 -
MOOSE RACING Valve Shim - 9.48 x 2.10 - 5 pack MSE5PK948210
MOOSE RACING
$9.95Valve train maintenance demands precision, and these MOOSE RACING shims deliver exactly that. When you're dialing in your valve clearances, having a complete set of accurately-sized shims—laser-etched for instant identification—eliminates guesswork and...09261946- SKU:
- 09261946
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 2.10 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.15 - 5 pack MSE5PK948215
MOOSE RACING
$9.95Valve shim maintenance is critical to keeping your engine running at peak performance, and having quality shims on hand eliminates downtime during valve train adjustments. MOOSE Racing shims are forged from 4140 cold rolled steel—not sintered—which means...09261947- SKU:
- 09261947
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.15 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.25 - 5 pack MSE5PK948225
MOOSE RACING
$9.95Valve shim maintenance is critical for precise valve train geometry and consistent engine performance. These MOOSE RACING shims eliminate guesswork during valve adjustments by offering accurate, individually-sized components that won't degrade under...09261949- SKU:
- 09261949
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 2.25 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 2.30 - 5 pack MSE5PK948230
MOOSE RACING
$9.95Proper valve shim selection is critical for maintaining correct valve clearances and engine performance—neglecting this during maintenance can lead to loss of power, increased noise, and premature wear. This 5-pack of MOOSE RACING valve shims gives you...09261950- SKU:
- 09261950
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 2.30 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
$9.95
