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 Top-End Rebuild Kit - Platinum Series - 1 mm 010-808-14P
WSM
$250.31A complete top-end rebuild requires precision-matched components that work in concert—mismatched or worn parts will compromise compression, increase blow-by, and kill your power output. The WSM...09030745- SKU:
- 09030745
- Availability:
- Ships Same Business Day
- Weight:
- 3.40 LBS
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- +1.00 MM
- TYPE:
- TOP END
- UNITS:
- EACH
- PRODUCT NAME:
- REBUILD KIT
- BORE SIZE METRIC:
- 83.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$250.31 -
WSM Top-End Rebuild Kit - Platinum Series - Standard 010-809-10P
WSM
$339.74A top-end rebuild demands precision components that can withstand extreme combustion pressures and sustained high RPM operation. The WSM Platinum Series kit delivers OEM-quality pistons paired with...09030746- SKU:
- 09030746
- Availability:
- Ships Same Business Day
- Weight:
- 4.00 LBS
- PRODUCT NAME:
- REBUILD KIT
- MODEL:
- PLATINUM SERIES
- PISTON SIZE METRIC:
- STANDARD
- TYPE:
- TOP END
- UNITS:
- EACH
- BORE SIZE METRIC:
- 87.91 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$339.74 -
WSM Top-End Rebuild Kit - Platinum Series - .50 mm 010-809-12P
WSM
$339.74A top-end rebuild is the most direct path to restoring cylinder head performance and extending engine life. The WSM Platinum Series kit eliminates the guesswork by bundling OEM-quality pistons,...09030747- SKU:
- 09030747
- Availability:
- Ships Same Business Day
- Weight:
- 4.10 LBS
- MODEL:
- PLATINUM SERIES
- TYPE:
- TOP END
- PRODUCT NAME:
- REBUILD KIT
- UNITS:
- EACH
- BORE SIZE METRIC:
- 88.41 MM
- PISTON SIZE METRIC:
- +0.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- WATERCRAFT
$339.74 -
XCELDYNE Valve Spring Bucket XBT22202
XCELDYNE
$140.49If you're pushing your engine to higher RPMs with performance camshafts, stock valve spring buckets become your limiting factor—creating excess wear on your cylinder head and robbing you of potential...09260625- SKU:
- 09260625
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- SPRING BUCKET
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
$140.49 -
MOOSE RACING Clutch Cover Gasket 816021
MOOSE RACING
$12.71A failing clutch cover gasket compromises engine sealing and invites oil leakage that degrades performance and reliability. The MOOSE RACING 816021 delivers OEM-equivalent sealing with high-tech...M816021- SKU:
- M816021
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- TYPE:
- CLUTCH COVER
- PRODUCT NAME:
- GASKET
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$12.71 -
MOOSE RACING Oil Filter - Yamaha DT-09-80
MOOSE RACING
$5.95A clean oil system is fundamental to engine longevity and performance. The MOOSE RACING Oil Filter DT-09-80 delivers reliable filtration that protects your engine from wear-causing contaminants,...07120229- SKU:
- 07120229
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- MICRON RATING:
- 10 MICRONS
- PRODUCT NAME:
- OIL FILTER
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STYLE:
- STANDARD
- TYPE:
- CARTRIDGE
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ATV
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
Twin Air Oil Filter Yamaha WR400F 1998-2000 WR426F 2001-2002 YZ250F 2001-2002 YZ400F 1998-1999 YZ426F 2000-2002 140008
TWIN AIR
$13.95Contaminated oil is the fastest way to accelerate wear on your 4-stroke Yamaha dirt bike. The Twin Air Oil Filter 140008 uses high-quality paper media to trap abrasive particles and sludge before...140008- SKU:
- 140008
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- STANDARD
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- CARTRIDGE
$13.95 -
Twin Air Oil Filter for KTM 1987-2023 Models 140013
TWIN AIR
$11.95Clean oil is the lifeblood of engine longevity, and a quality filter is non-negotiable for maintaining peak performance. The Twin Air Oil Filter delivers reliable contaminant removal across the...140013- SKU:
- 140013
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- FILTER MEDIA MATERIAL:
- PAPER
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- PRODUCT NAME:
- OIL FILTER
- STYLE:
- FIRST FILTER FOR DUAL FILTER APPLICATIONS
- TYPE:
- CARTRIDGE
$11.95 -
On Sale
Pro Circuit Stainless Steel Power Valve for Kawasaki KX85 2002-2013 PVK01085
PRO CIRCUIT
MSRP: $229.95Now: $206.96Was: $229.95If you're running a KX85 and want measurable gains in low-end acceleration without sacrificing top-end power, a quality power valve upgrade is one of the highest-ROI modifications available. The Pro...09310477- SKU:
- 09310477
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- MATERIAL:
- STAINLESS STEEL
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PRODUCT NAME:
- POWER VALVE
MSRP: $229.95Now: $206.96Was: $229.95 -
HOT RODS Crankshaft - OEM Stroke - Can-Am HR00063
HOT RODS
$592.95When your Can-Am crankshaft shows signs of wear or damage, a factory-trued replacement ensures you're back to OEM performance standards without compromise. This HOT RODS crankshaft maintains the...09210885- SKU:
- 09210885
- Availability:
- Ships Same Business Day
- Weight:
- 13.35 LBS
$592.95 -
HOT RODS Bottom End Kit - OE Crankshaft Replacement - Polaris HR00119
HOT RODS
$1,591.95A bottom-end rebuild demands precision components that won't compromise engine reliability or performance. This HOT RODS kit eliminates the guesswork by bundling OE-spec crankshaft replacement parts...09210898- SKU:
- 09210898
- Availability:
- Ships Same Business Day
- Weight:
- 24.35 LBS
$1,591.95 -
MOOSE OFFROAD Oil Filter - Kawasaki/Suzuki DT-09-41
MOOSE OFFROAD
$5.95Keep your Kawasaki or Suzuki engine running clean with a filter engineered to handle the demands of serious riding. This MOOSE OFFROAD oil filter delivers reliable protection through every ride,...07120223- SKU:
- 07120223
- Availability:
- Ships Same Business Day
- Weight:
- 0.12 LBS
$5.95Qty in Cart: 0Quantity:Price:$5.95Subtotal: -
MOOSE OFFROAD Motor Gasket Kit with Oil Seal - Honda 811261MSE
MOOSE OFFROAD
$110.53A failing gasket or oil seal will compromise engine integrity and lead to costly leaks, performance loss, and potential catastrophic failure. This MOOSE OFFROAD Motor Gasket Kit delivers...M811261- SKU:
- M811261
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
$110.53 -
MOOSE OFFROAD Oil Seal Set - Suzuki 822309MSE
MOOSE OFFROAD
$23.29A complete engine and transmission rebuild demands precision sealing—any leak compromises performance and longevity. This MOOSE OFFROAD Oil Seal Set eliminates guesswork by consolidating all...09351185- SKU:
- 09351185
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$23.29Qty in Cart: 0Quantity:Price:$23.29Subtotal: -
MOOSE OFFROAD Top End Gasket Set 8100033MSE
MOOSE OFFROAD
$52.94A top-end gasket failure doesn't just leak—it compromises combustion integrity and puts your engine rebuild at risk. This complete MOOSE OFFROAD gasket set eliminates the guesswork of sourcing...09346890- SKU:
- 09346890
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
$52.94 -
MOOSE OFFROAD Top End Gasket Set - Honda 8100029MSE
MOOSE OFFROAD
$27.22A complete top-end rebuild demands precision gaskets and seals that won't fail under heat and compression cycles. This MOOSE OFFROAD gasket set gives you everything needed for a thorough engine and...09346914- SKU:
- 09346914
- Availability:
- Ships Same Business Day
- Weight:
- 0.17 LBS
$27.22Qty in Cart: 0Quantity:Price:$27.22Subtotal: -
MOOSE OFFROAD Gasket Set with Seals - Suzuki 8110045MSE
MOOSE OFFROAD
$77.00A complete engine and transmission rebuild demands precision sealing at every junction—any compromise risks oil leakage, pressure loss, and catastrophic failure. This MOOSE OFFROAD gasket set...09346975- SKU:
- 09346975
- Availability:
- Ships Same Business Day
- Weight:
- 0.21 LBS
$77.00Qty in Cart: 0Quantity:Price:$77.00Subtotal: -
MOOSE OFFROAD Ignition Cover Gasket - Suzuki 816817MSE
MOOSE OFFROAD
$13.39A failing ignition cover gasket leads to oil seepage, potential engine contamination, and premature wear on internal components. Whether you're replacing a clutch or addressing a persistent leak,...09346976- SKU:
- 09346976
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
$13.39 -
On Sale
PROX Top End Gasket Set - Kawasaki 35.4429
PROX
MSRP: $59.95Now: $51.00Was: $59.95A top-end rebuild demands gaskets that seal reliably under extreme combustion pressures and temperature fluctuations—anything less risks oil leaks, compression loss, and catastrophic engine failure...09347140- SKU:
- 09347140
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
MSRP: $59.95Now: $51.00Was: $59.95Qty in Cart: 0Quantity:Price:MSRP: $59.95Now: $51.00Was: $59.95Subtotal: -
On Sale
PROX Top End Gasket Set - Sherco 35.7334
PROX
MSRP: $54.95Now: $47.00Was: $54.95A top-end rebuild demands gasket integrity—any leak or failure compromises combustion efficiency and reliability. The PROX 35.7334 gasket set delivers precision-engineered sealing surfaces that...09347152- SKU:
- 09347152
- Availability:
- Ships Same Business Day
- Weight:
- 0.16 LBS
MSRP: $54.95Now: $47.00Was: $54.95Qty in Cart: 0Quantity:Price:MSRP: $54.95Now: $47.00Was: $54.95Subtotal:
