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 OFFROAD Gasket Kit with Oil Seal - Honda 8110043MSE
MOOSE OFFROAD
$112.56A complete engine and transmission rebuild demands precision—and compromised gaskets or seals will undermine even the best machine work. This MOOSE OFFROAD Gasket Kit gives you factory-correct...09347197- SKU:
- 09347197
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$112.56 -
MOOSE OFFROAD Complete Motor Gasket Kit - Honda 808213MSE
MOOSE OFFROAD
$169.49A complete engine and transmission rebuild demands precision gaskets and seals that won't compromise reliability or performance. MOOSE Offroad delivers a comprehensive kit with all necessary...09347198- SKU:
- 09347198
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$169.49 -
MOOSE OFFROAD Top End Gasket Kit - Honda 8100042MSE
MOOSE OFFROAD
$106.05A top-end rebuild demands precision gasket-to-surface contact—any compromise in material quality or fit tolerance will result in oil weeping, combustion leakage, and accelerated wear. The MOOSE...09347199- SKU:
- 09347199
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$106.05 -
MOOSE OFFROAD Complete Gasket Kit - Yamaha 8080028MSE
MOOSE OFFROAD
$154.90A complete engine and transmission rebuild demands precision gaskets that won't fail under load—and OEM replacements come with OEM pricing. The MOOSE OFFROAD Complete Gasket Kit delivers durability...09347200- SKU:
- 09347200
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
$154.90 -
MOOSE OFFROAD Complete Gasket Kit - Honda 8080040MSE
MOOSE OFFROAD
$86.16A complete engine and transmission rebuild demands precision-fit gaskets that won't compromise your reliability or budget. The MOOSE OFFROAD Complete Gasket Kit delivers OEM-quality sealing at a...09347201- SKU:
- 09347201
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$86.16 -
MOOSE OFFROAD Top End Gasket Kit - Suzuki 8100037MSE
MOOSE OFFROAD
$20.15A top-end rebuild demands precision—mismatched or worn gaskets compromise compression, invite oil weeping, and sabotage engine reliability. The MOOSE OFFROAD Top End Gasket Kit delivers a complete,...09347202- SKU:
- 09347202
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$20.15Qty in Cart: 0Quantity:Price:$20.15Subtotal: -
MOOSE OFFROAD Clutch Cylinder Guard - Gas Gas/Husqvarna/KTM 13-1021
MOOSE OFFROAD
$42.95Hydraulic clutch cylinders are vulnerable to impact damage and chain strikes—two of the most common causes of mid-race failures. This MOOSE OFFROAD guard protects your clutch cylinder with...09500988- SKU:
- 09500988
- Availability:
- Ships Same Business Day
- Weight:
- 0.47 LBS
$42.95 -
MOOSE OFFROAD Slave Cylinder Rebuild Kit - Honda 18-6040
MOOSE OFFROAD
$29.95A leaking slave cylinder compromises both safety and clutch performance, leading to spongy engagement and potential hydraulic failure. This rebuild kit gives you a cost-effective alternative to full...09500987- SKU:
- 09500987
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
$29.95Qty in Cart: 0Quantity:Price:$29.95Subtotal: -
MOOSE OFFROAD Exhaust Gasket Kit - Yamaha 823200MSE
MOOSE OFFROAD
$29.14Exhaust gaskets are critical wear items that deteriorate under thermal cycling and vibration, leading to exhaust leaks that compromise performance and increase emissions. The MOOSE OFFROAD Exhaust...09347189- SKU:
- 09347189
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$29.14 -
MOOSE OFFROAD Exhaust Gasket Kit - Yamaha 823201MSE
MOOSE OFFROAD
$15.81A compromised exhaust seal costs you power and reliability. This Moose Offroad gasket kit eliminates leaks at critical connection points, restoring the backpressure and flow characteristics your...09347190- SKU:
- 09347190
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$15.81 -
MOOSE OFFROAD Exhaust Gasket Kit - KTM 823195MSE
MOOSE OFFROAD
$16.37Exhaust gasket deterioration is one of the most common causes of performance loss and exhaust leaks on KTM 4-stroke engines. A failing gasket compromises seal integrity, allowing unburned fuel to...09347191- SKU:
- 09347191
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
$16.37 -
MOOSE OFFROAD Exhaust Gasket Kit - Beta 823205MSE
MOOSE OFFROAD
$6.01A failing exhaust gasket compromises both performance and reliability—allowing exhaust gases to escape before they reach your powerband and introducing unwanted air leaks that throw off your fuel...09347193- SKU:
- 09347193
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
$6.01Qty in Cart: 0Quantity:Price:$6.01Subtotal: -
REKLUSE Clutch Cover - Gas Gas/Husqvarna/KTM RMS-0413065
REKLUSE
$229.00Stock clutch covers fail under the rigors of aggressive riding—impacts with rocks, logs, and boot contact compromise both protection and oil containment. The REKLUSE Clutch Cover replaces this...09402216- SKU:
- 09402216
- Availability:
- Ships Same Business Day
- Weight:
- 0.83 LBS
$229.00 -
HOT RODS Bottom End Kit - OE Crankshaft Kit - Husqvarna | KTM HR00178
HOT RODS
$713.95A complete bottom-end rebuild demands precision components and proper sealing—this kit eliminates the guesswork by bundling everything you need for crankshaft installation in one package. Whether...09210951- SKU:
- 09210951
- Availability:
- Ships Same Business Day
- Weight:
- 12.10 LBS
$713.95Qty in Cart: 0Quantity:Price:$713.95Subtotal: -
MOOSE RACING Intake Valve M40-41650
MOOSE RACING
$196.95Stock intake valves are often the limiting factor in engine breathing efficiency—premature wear and suboptimal flow characteristics directly impact power output and reliability. The MOOSE RACING...09263371- SKU:
- 09263371
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
$196.95 -
MOOSE RACING Exhaust Valve M30-34010
MOOSE RACING
$196.95Stock exhaust valves reach their limits in high-performance applications, leading to premature wear and reduced engine reliability. The MOOSE RACING M30-34010 extends valve train life up to 4x longer...09263374- SKU:
- 09263374
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
$196.95 -
MOOSE RACING Valve Seal Kit M30-34020
MOOSE RACING
$15.95Worn or degraded valve seals cause oil consumption, compression loss, and poor combustion efficiency—problems that compound quickly under racing or high-load conditions. The MOOSE RACING M30-34020...09263375- SKU:
- 09263375
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
$15.95 -
MOOSE RACING Valve Seal Kit M40-41680
MOOSE RACING
$15.95Engine valve seals naturally degrade under heat and combustion pressures, leading to oil leakage, blue smoke, and reduced compression. The MOOSE RACING Valve Seal Kit M40-41680 replaces worn seals...09263376- SKU:
- 09263376
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
$15.95 -
On Sale
Wossner Crankshaft Assembly for KTM SX125 2016-2022 Husqvarna TC125 2016-2022 GasGas MC125 2021-2022 CS2070
WOSSNER
MSRP: $342.00Now: $324.90Was: $342.00A worn or damaged crankshaft assembly compromises power transfer, throttle response, and engine longevity—particularly critical in 2-stroke competition machines where precision clearances determine...09210879- SKU:
- 09210879
- Availability:
- Ships Same Business Day
- Weight:
- 6.25 LBS
MSRP: $342.00Now: $324.90Was: $342.00 -
On Sale
WOSSNER Crankshaft Assembly - Husaberg | Husqvarna | KTM CS2012
WOSSNER
MSRP: $342.00Now: $324.90Was: $342.00A worn or damaged crankshaft assembly compromises engine reliability and performance—especially critical in high-demand riding conditions where precision matters. The WOSSNER CS2012 delivers...09210880- SKU:
- 09210880
- Availability:
- Ships Same Business Day
- Weight:
- 6.95 LBS
MSRP: $342.00Now: $324.90Was: $342.00
