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 Motor Seals - KX80/100 822291
MOOSE RACING
$22.53Engine seal degradation compromises compression, increases blow-by, and accelerates internal wear—replacement seals are non-negotiable for engine longevity. MOOSE Racing Motor Seals deliver OEM-equivalent performance at a fraction of dealership pricing,...09350055- SKU:
- 09350055
- Availability:
- Ships Same Business Day
- Weight:
- 0.23 LBS
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- PRODUCT NAME:
- SEAL
- UNITS:
- SET
$22.53 -
MOOSE RACING Motor Seals KX80-100/RM100 822292
MOOSE RACING
$27.45Engine seals are critical to maintaining oil pressure, preventing leakage, and protecting internal components from contamination. OEM replacement seals often come with sticker shock, but Moose Racing delivers genuine-quality gasket and seal sets at a...09350056- SKU:
- 09350056
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$27.45 -
MOOSE RACING Motor Seals - KDX 200/220 822296
MOOSE RACING
$30.68Engine and transmission seals are critical wear items that directly impact reliability and oil containment. The MOOSE RACING Motor Seals kit eliminates the guesswork of sourcing individual seals by delivering a complete OEM-spec replacement set at a...09350060- SKU:
- 09350060
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- PRODUCT NAME:
- SEAL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- ENGINE
- TYPE:
- OIL
- UNITS:
- SET
$30.68 -
MOOSE RACING Intake Valve Kit M80-81100
MOOSE RACING
$196.95Factory titanium intake valves wear out faster than you'd like, especially under high-RPM conditions where thermal stress compounds quickly. The MOOSE RACING Intake Valve Kit replaces them with stainless steel Black Diamond valves that deliver up to 4x...09262732- SKU:
- 09262732
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- APPLICATION:
- INTAKE
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE KIT
- UNITS:
- KIT
$196.95 -
MOOSE RACING Valve and Spring Kit M80-81110
MOOSE RACING
$196.95If you're running your engine hard, valve train durability becomes non-negotiable. The MOOSE RACING Valve and Spring Kit M80-81110 replaces wear-prone OEM titanium components with stainless steel Black Diamond intake valves engineered to last 4x longer...09262733- SKU:
- 09262733
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
$196.95 -
MOOSE RACING Valve Shim - 9.48 x 3.15 - 5 pack MSE5PK948315
MOOSE RACING
$9.95Valve shim maintenance is critical for engine longevity and peak performance, and having the right shims on hand eliminates costly downtime during valve train adjustments. These MOOSE RACING shims are forged from durable 4140 cold rolled steel—not...09261967- SKU:
- 09261967
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- 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:
- 3.15 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- OFF-ROAD
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.20 - 5 pack MSE5PK948320
MOOSE RACING
$9.95Valve shim maintenance is critical to engine longevity and performance—incorrect shim selection leads to improper valve clearance, misfires, and accelerated wear on your valve train. This 5-pack from MOOSE Racing gives you the precision sizing you need...09261968- SKU:
- 09261968
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- TYPE:
- VALVE
- VALVE SHIM THICKNESS METRIC:
- 3.20 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.30 - 5 pack MSE5PK948330
MOOSE RACING
$9.95Valve train maintenance demands precision, and these MOOSE RACING shims deliver it. Forged from 4140 cold rolled steel—not sintered—they resist deformation under valve spring pressure and maintain consistent clearances over thousands of heat cycles. The...09261970- SKU:
- 09261970
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 3.30 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$9.95 -
MOOSE RACING Valve Shim - 9.48 x 3.35 - 5 pack MSE5PK948335
MOOSE RACING
$9.95Precision valve train maintenance starts with the right shims. If you're dialing in clearances on a built engine or refreshing a valve train, having quality shims in multiple sizes eliminates guesswork and saves you from multiple supply runs. These 4140...09261971- SKU:
- 09261971
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.35 MM
- MATERIAL:
- ROLLED
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ATV
$9.95 -
MOOSE RACING Intake Valve Kit M30-31500
MOOSE RACING
$217.95If your engine is pushing hard on the track or street, your intake valves are working overtime—and OEM titanium components simply can't keep up with extended use. The MOOSE RACING Intake Valve Kit M30-31500 replaces those wear-prone originals with...09262432- SKU:
- 09262432
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
$217.95 -
MOOSE RACING Valve and Spring Kit M30-31660
MOOSE RACING
$217.95If you're running high-mileage or high-boost applications, OEM titanium valves can become a limiting factor in reliability and longevity. The MOOSE RACING Valve and Spring Kit replaces them with stainless steel Black Diamond intake valves engineered to...09262433- SKU:
- 09262433
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- APPLICATION:
- INTAKE
$217.95 -
MOOSE RACING Valve and Spring Kit M30-31760
MOOSE RACING
$217.95If you're running high-mileage power through your engine, OEM titanium intake valves will eventually become a maintenance liability. The MOOSE RACING Valve and Spring Kit M30-31760 replaces them with stainless steel Black Diamond valves that extend valve...09262434- SKU:
- 09262434
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
$217.95 -
MOOSE RACING Valve and Spring Kit M30-32260
MOOSE RACING
$196.95If you're running high-mileage track sessions or pushing your engine to the limit, OEM titanium intake valves won't cut it—they fatigue, fail, and force costly downtime. The MOOSE RACING Valve and Spring Kit M30-32260 replaces them with stainless steel...09262438- SKU:
- 09262438
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE AND SPRING KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
$196.95 -
MOOSE RACING Intake Valve Kit M40-41450
MOOSE RACING
$217.95OEM intake valves wear out, and replacement cycles eat into your bottom line. The MOOSE RACING Intake Valve Kit M40-41450 extends valve train life by up to 4x compared to stock titanium components while simultaneously improving flow characteristics and...09263198- SKU:
- 09263198
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- APPLICATION:
- INTAKE
$217.95 -
MOOSE RACING Valve and Spring Kit M40-41455
MOOSE RACING
$196.95If you're running high-mileage track sessions or pushing your engine to the limit, OEM titanium intake valves will eventually cost you reliability and performance. The MOOSE RACING Valve and Spring Kit replaces those wear-prone components with stainless...09263199- SKU:
- 09263199
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
$196.95 -
MOOSE RACING Intake Valve Kit M30-33680
MOOSE RACING
$217.95If you're running high-revving applications or extended racing seasons, OEM titanium intake valves will eventually fail you—often at the worst possible moment. The MOOSE RACING Stainless Steel Intake Valve Kit M30-33680 replaces that weak link with Black...09263303- SKU:
- 09263303
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$217.95 -
MOOSE RACING Magnetic Drain Plug DP115
MOOSE RACING
$23.95Metal particles inevitably accumulate in your engine oil—especially under high-performance driving conditions. The MOOSE RACING Magnetic Drain Plug DP115 captures ferrous debris before it can cause wear on critical engine components, extending bearing...09200047- SKU:
- 09200047
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- DIAMETER - THREAD SIZE METRIC:
- M16 X 1.50 X 12 MM
- MATERIAL:
- 7075 ALUMINUM
- PRODUCT NAME:
- PLUG
- UNITS:
- EACH
- COLOR/FINISH:
- SILVER
- FEATURES:
- NON-MAGNETIC
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- DRAIN
$23.95 -
MOOSE RACING Valve Shim - 10.0 x 2.95 - 5 pack MSE5PK1000295
MOOSE RACING
$10.95Proper valve clearance is critical to engine performance and longevity—even slight deviations can cause compression loss, valve float, or premature wear. These MOOSE RACING valve shims give you precision control over your valve train geometry without the...09261852- SKU:
- 09261852
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- MATERIAL:
- ROLLED
- VALVE SHIM THICKNESS METRIC:
- 2.95 MM
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- MATERIAL:
- STEEL
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$10.95 -
MOOSE RACING Valve Shim - 10.0 x 3.15 - 5 pack MSE5PK1000315
MOOSE RACING
$10.95Valve shim maintenance demands precision—improper sizing compromises valve clearance and engine performance. These MOOSE RACING shims eliminate guesswork with laser-etched identification, ensuring you select the correct size every time during valve train...09261856- SKU:
- 09261856
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- OUTSIDE DIAMETER METRIC:
- 10.00 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 3.15 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
$10.95 -
MOOSE RACING Valve Shim - 9.48 x 2.95 - 5 pack MSE5PK948295
MOOSE RACING
$9.95Valve train maintenance requires precision—and guesswork doesn't belong in your engine bay. These MOOSE RACING valve shims give you the exact sizing and durability needed to dial in your valve clearances without the frustration of hunting down individual...09261963- SKU:
- 09261963
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- VALVE SHIM THICKNESS METRIC:
- 2.95 MM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- ROLLED
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
$9.95
