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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WSM Piston Assembly - Sea-Doo - +.5 mm 010-862-05K
WSM
$242.28A high-revving engine demands pistons engineered for sustained performance under extreme conditions. The WSM Piston Assembly delivers OEM-equivalent quality with advanced thermal management and durability features that extend engine life while unlocking...09101275- SKU:
- 09101275
- Availability:
- Ships Same Business Day
- Weight:
- 1.28 LBS
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
$242.28 -
WSM Piston Kit - Polaris - Standard 010-835K
WSM
$89.33Stock pistons wear down under sustained high-RPM operation, leading to blow-by, compression loss, and reduced power output. The WSM Piston Kit delivers OEM-equivalent quality with engineering refinements that enhance durability and thermal management,...09100655- SKU:
- 09100655
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 84.00 MM
- MODEL:
- ORIGINAL
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
$89.33 -
WSM Piston Kit - Polaris - +1 mm 010-835-07K
WSM
$89.33When you're pushing your Polaris to the limit, stock pistons become your bottleneck—they're simply not engineered for sustained high-performance demands. The WSM Piston Kit delivers OEM-equivalent quality with critical performance upgrades: a proprietary...09100657- SKU:
- 09100657
- Availability:
- Ships Same Business Day
- Weight:
- 1.32 LBS
- MODEL:
- ORIGINAL
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 84.00 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- RIDING STYLE:
- WATERCRAFT
- PRODUCT NAME:
- PISTON KIT
$89.33 -
WSM Piston Kit - Yamaha - Standard 010-827K
WSM
$80.40A piston kit is only as good as its ability to withstand extreme combustion pressures while maintaining thermal efficiency—and the WSM Piston Kit delivers on both fronts. The MOS2 coating on the skirts actively dissipates heat while reducing friction,...09100659- SKU:
- 09100659
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- MODEL:
- ORIGINAL
$80.40 -
WSM Piston Kit - Yamaha - +.5 mm 010-827-05K
WSM
$80.40A worn or damaged piston directly limits your engine's ability to produce consistent power and can lead to catastrophic failure if left unchecked. The WSM Piston Kit delivers OEM-equivalent quality with engineered improvements—particularly the enhanced...09100660- SKU:
- 09100660
- Availability:
- Ships Same Business Day
- Weight:
- 1.00 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
- PRODUCT NAME:
- PISTON KIT
$80.40 -
WSM Piston Kit - Yamaha - +1 mm 010-827-07K
WSM
$80.40If you're rebuilding a Yamaha engine or pushing higher compression ratios, piston quality directly impacts reliability, power output, and engine longevity. The WSM +1mm 010-827-07K kit delivers OEM-equivalent construction with factory-proven geometry,...09100661- SKU:
- 09100661
- Availability:
- Ships Same Business Day
- Weight:
- 0.90 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 81.00 MM
- MODEL:
- ORIGINAL
$80.40 -
WSM Top-End Rebuild Kit - Original Series - 1 mm 010-819-14
WSM
$330.79A complete top-end rebuild demands precision components that won't compromise engine integrity or performance. The WSM Original Series kit delivers OEM-quality pistons, rings, and bearings in one package, eliminating the guesswork of sourcing individual...09030122- SKU:
- 09030122
- Availability:
- Ships Same Business Day
- Weight:
- 4.15 LBS
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.91 MM
- MODEL:
- ORIGINAL SERIES
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
$330.79 -
WSM Oil Filter - Sea-Doo 2-Stroke 006-546
WSM
$8.60Proper oil filtration is critical for 2-stroke performance—contaminants in your oil system accelerate wear on rings, bearings, and piskets, cutting engine life short. The WSM Oil Filter 006-546 is engineered to OEM specifications for Sea-Doo 2-stroke...07120178- SKU:
- 07120178
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- COLOR/FINISH:
- WHITE
- PRODUCT NAME:
- OIL-INJECTION FILTER
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- CARTRIDGE
- STYLE:
- 2-STROKE
- STYLE:
- SEA-DOO
- UNITS:
- EACH
- BASE COLOR:
- WHITE
- MATERIAL:
- PLASTIC
$8.60 -
WSM Piston Assembly - Sea-Doo - +.5 mm 010-861-05PK
WSM
$133.96OEM-quality pistons are the foundation of reliable engine performance, and this WSM assembly delivers durability without compromise. The advanced MOS2 coating reduces friction and heat while actively drawing thermal energy away from critical ring...09101273- SKU:
- 09101273
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE SIZE METRIC:
- 99.96 MM
- PISTON MATERIAL:
- ALUMINUM
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- WATERCRAFT
- MODEL:
- PLATINUM
- PRODUCT NAME:
- PISTON KIT
$133.96 -
XCELDYNE Intake Valve XIVM13001
XCELDYNE
$198.35Stock intake valves limit your engine's breathing potential and cap horsepower gains from other modifications. The XCELDYNE Intake Valve XIVM13001 delivers measurable airflow improvements through advanced high-flow geometry, enabling your engine to...09260469- SKU:
- 09260469
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- SIZE METRIC:
- OVERSIZE (+1.00 MM)
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
$198.35 -
On Sale
XCELDYNE Exhaust Valve XEVM12001
XCELDYNE
MSRP: $160.58Now: $103.00Was: $160.58If you're chasing measurable gains in flow efficiency and engine responsiveness, the XCELDYNE Exhaust Valve XEVM12001 delivers the precision engineering that separates competitive builds from stock setups. The titanium construction paired with high-flow...09260490- SKU:
- 09260490
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
MSRP: $160.58Now: $103.00Was: $160.58 -
XCELDYNE Exhaust Valve XEVM13000
XCELDYNE
$202.40If you're serious about extracting maximum flow and power from your engine, stock exhaust valves are leaving performance on the table. The XCELDYNE XEVM13000 delivers a measurable 15% flow increase through precision engineering and lightweight titanium...09260491- SKU:
- 09260491
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- SIZE METRIC:
- STANDARD
- UNITS:
- EACH
$202.40 -
XCELDYNE Intake Valve Springs PSIMX2104
XCELDYNE
$75.57If you're running a high-revving engine with titanium valves, valve spring performance directly impacts your peak horsepower and reliability under sustained boost or cam aggression. The XCELDYNE Intake Valve Springs PSIMX2104 are engineered with a...09260643- SKU:
- 09260643
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- PRODUCT NAME:
- SPRING
- UNITS:
- PAIR
$75.57 -
XCELDYNE Exhaust Valve Springs PSIMX2401
XCELDYNE
$75.57If you're serious about extracting maximum horsepower from your engine, valve spring selection directly impacts your cam's ability to perform. The XCELDYNE Exhaust Valve Springs PSIMX2401 deliver the low-drag design racers demand, allowing your...09260647- SKU:
- 09260647
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- SPRING
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- VALVE
- UNITS:
- PAIR
$75.57 -
On Sale
KIBBLEWHITE Valve Seal - 4.5mm - Viton 80-80710
KIBBLEWHITE
MSRP: $17.45Now: $15.71Was: $17.45Valve seals are critical to controlling oil consumption and maintaining combustion chamber integrity—a worn or inadequate seal can lead to oil burning, carbon buildup, and lost power. The Kibblewhite 4.5mm Viton 80-80710 delivers OEM-specification...09263369- SKU:
- 09263369
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SEAL
- STEM DIAMETER METRIC:
- 4.50 MM
- TYPE:
- VALVE
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.370'
- MATERIAL:
- VITON
- UNITS:
- SET OF 8
MSRP: $17.45Now: $15.71Was: $17.45 -
Twin Air Oil Filter for Honda TRX700XX 2008-2009 XL250R 1984-1987 140001
TWIN AIR
$11.95A quality oil filter is non-negotiable for engine longevity—it directly impacts how well contaminants are removed from your oil and how effectively your engine stays protected under load. The Twin Air 140001 delivers superior filtration efficiency with...140001- SKU:
- 140001
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- STYLE:
- STANDARD
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
$11.95 -
Twin Air Oil Filter for Honda CRF150R 2007-2024 CRF250R 2004-2024 CRF450R 2002-2024 140003
TWIN AIR
$11.95Engine protection starts with filtration, and the Twin Air Oil Filter 140003 delivers the particle separation your Honda CRF needs to run clean and reliable through thousands of miles of demanding off-road riding. A quality oil filter is non-negotiable...140003- SKU:
- 140003
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
$11.95 -
Twin Air Oil Filter for Kawasaki KL600 1984-1986 KLX250R 1994-1996 KL250 1982-1984 KL650B Tengai 1990-1991 KLF300 Bayou 2x4 1989-2003 140004
TWIN AIR
$11.95Clean oil is the lifeblood of engine longevity, and the Twin Air Oil Filter 140004 ensures your Kawasaki stays protected with efficient particle removal and consistent flow rates. This OEM-equivalent filter handles the demanding demands of both street...140004- SKU:
- 140004
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$11.95 -
Twin Air Oil Filter for Suzuki LT-F160 1991-2004 LT-F250 1988-2001 DR200SE 1996-2009 DR-Z125 2003-2014 140005
TWIN AIR
$11.95Clean oil is non-negotiable for engine longevity, and a quality oil filter is your first line of defense against particulate damage. The Twin Air 140005 delivers OEM-equivalent filtration performance across multiple Suzuki models, ensuring your engine...140005- SKU:
- 140005
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
- UNITS:
- EACH
- STYLE:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- PRODUCT NAME:
- OIL FILTER
$11.95 -
Twin Air Oil Filter for KTM 250 350 450 500 525 530 2007-2024 140019
TWIN AIR
$11.95Proper oil filtration is non-negotiable for maintaining peak engine performance and extending the service life of your KTM dirt bike. The Twin Air 140019 delivers reliable particle removal and superior flow characteristics across the full 2007–2024 model...7120133- SKU:
- 7120133
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- FILTER MEDIA MATERIAL:
- PAPER
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
$11.95
