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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On Sale
ATHENA Complete Gasket Kit - Honda P400210850250
ATHENA
MSRP: $57.95Now: $52.00Was: $57.95A complete engine rebuild demands gasket integrity that won't compromise under sustained combustion pressures and extreme temperatures. The ATHENA Complete Gasket Kit delivers the precision sealing your Honda needs, whether you're freshening a stock...400210850250- SKU:
- 400210850250
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
MSRP: $57.95Now: $52.00Was: $57.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850248
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95A complete gasket kit is non-negotiable for any engine rebuild—it's your insurance policy against leaks, blow-by, and premature failure. The ATHENA P400210850248 delivers OEM-quality gasket sets engineered to handle sustained high RPM and elevated...400210850248- SKU:
- 400210850248
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850221
ATHENA
MSRP: $94.95Now: $85.00Was: $94.95A complete gasket kit is essential for any top-end rebuild or full engine overhaul—it ensures leak-free sealing across all critical surfaces and prevents catastrophic failures under high combustion pressures. The ATHENA P400210850221 delivers OEM-quality...400210850221- SKU:
- 400210850221
- Availability:
- Ships Same Business Day
- Weight:
- 0.44 LBS
MSRP: $94.95Now: $85.00Was: $94.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850214
ATHENA
MSRP: $73.95Now: $67.00Was: $73.95Whether you're rebuilding a tired engine or preparing for sustained high-RPM operation, gasket failure isn't an option. The ATHENA Complete Gasket Kit delivers the sealing integrity you need across all critical engine surfaces, with materials engineered...400210850214- SKU:
- 400210850214
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
MSRP: $73.95Now: $67.00Was: $73.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850126
ATHENA
MSRP: $52.95Now: $48.00Was: $52.95A complete engine rebuild demands gasket materials engineered to handle extreme combustion pressures and temperature cycling without compromising sealing integrity. Athena's gasket kit eliminates the guesswork and sourcing headaches by bundling all...400210850126- SKU:
- 400210850126
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $52.95Now: $48.00Was: $52.95 -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850103
ATHENA
MSRP: $41.95Now: $38.00Was: $41.95Engine gasket degradation leads to compression loss, coolant seepage, and oil leaks that compromise reliability and performance. The ATHENA Complete Gasket Kit delivers OEM-quality sealing across your entire top-end assembly with materials engineered to...400210850103- SKU:
- 400210850103
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $41.95Now: $38.00Was: $41.95Qty in Cart: 0Quantity:Price:MSRP: $41.95Now: $38.00Was: $41.95Subtotal: -
On Sale
ATHENA Complete Gasket Kit - Honda P400210850084
ATHENA
MSRP: $42.95Now: $39.00Was: $42.95A complete engine rebuild demands gasket integrity that won't fail under sustained load and elevated temperatures. Athena's Complete Gasket Kit delivers the precision sealing required for high-performance applications, with materials engineered to...400210850084- SKU:
- 400210850084
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $42.95Now: $39.00Was: $42.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600520
ATHENA
MSRP: $40.95Now: $37.00Was: $40.95Engine gasket integrity is critical when you're pushing your Honda to competition levels—worn or degraded seals compromise compression, throttle response, and reliability when it matters most. The ATHENA Top End Gasket Kit gives you the precision sealing...400210600520- SKU:
- 400210600520
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $40.95Now: $37.00Was: $40.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600505/1
ATHENA
MSRP: $94.95Now: $85.00Was: $94.95Pre-race engine freshening demands precision gasket materials that won't compromise your compression ratio or reliability when you're chasing a podium finish. The ATHENA Top End Gasket Kit gives you the flexibility to run your engine optimized for either...400210600505- SKU:
- 400210600505
- Availability:
- Ships Same Business Day
- Weight:
- 0.38 LBS
MSRP: $94.95Now: $85.00Was: $94.95Qty in Cart: 0Quantity:Price:MSRP: $94.95Now: $85.00Was: $94.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600221
ATHENA
MSRP: $76.95Now: $69.00Was: $76.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit delivers the precision sealing your engine demands under high-load conditions. This kit gives you the flexibility to run either pump gas with...400210600221- SKU:
- 400210600221
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $76.95Now: $69.00Was: $76.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600220
ATHENA
MSRP: $84.95Now: $76.00Was: $84.95Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit ensures your Honda engine maintains peak sealing integrity under demanding conditions. This kit gives you the flexibility to run either standard...400210600220- SKU:
- 400210600220
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
MSRP: $84.95Now: $76.00Was: $84.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600214
ATHENA
MSRP: $53.95Now: $49.00Was: $53.95Whether you're prepping for race day or performing a midseason engine refresh, the ATHENA Top End Gasket Kit ensures a proper seal across your engine's critical compression chamber. This kit gives you the flexibility to run standard pump gas with stock...400210600214- SKU:
- 400210600214
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $53.95Now: $49.00Was: $53.95Qty in Cart: 0Quantity:Price:MSRP: $53.95Now: $49.00Was: $53.95Subtotal: -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600210
ATHENA
MSRP: $34.95Now: $31.00Was: $34.95Engine freshness directly impacts race day performance, and the ATHENA Top End Gasket Kit gives you the precision sealing needed to maximize compression and fuel efficiency. Whether you're running stock gas with standard compression or stepping up to...400210600210- SKU:
- 400210600210
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
MSRP: $34.95Now: $31.00Was: $34.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600126
ATHENA
MSRP: $33.95Now: $31.00Was: $33.95A fresh top end gasket kit is essential before hitting the track, ensuring a proper seal that maintains compression integrity and prevents mid-race failures. The ATHENA P400210600126 gives you the flexibility to optimize your engine for either pump gas...400210600126- SKU:
- 400210600126
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $33.95Now: $31.00Was: $33.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600103
ATHENA
MSRP: $27.95Now: $25.00Was: $27.95When race season demands peak performance, engine reliability becomes non-negotiable. The ATHENA Top End Gasket Kit is engineered for riders who won't compromise on compression ratios or fuel choice—giving you the flexibility to run standard fuel with...400210600103- SKU:
- 400210600103
- Availability:
- Ships Same Business Day
- Weight:
- 0.19 LBS
MSRP: $27.95Now: $25.00Was: $27.95 -
On Sale
ATHENA Top End Gasket Kit - Honda P400210600087
ATHENA
MSRP: $18.85Now: $16.00Was: $18.85Whether you're prepping for race day or executing a midseason engine refresh, the ATHENA Top End Gasket Kit delivers the reliability you need when it matters most. This kit is engineered for pros and amateurs alike who demand precision between cylinder...400210600087- SKU:
- 400210600087
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
MSRP: $18.85Now: $16.00Was: $18.85Qty in Cart: 0Quantity:Price:MSRP: $18.85Now: $16.00Was: $18.85Subtotal: -
Wiseco Piston Kit 1mm Oversize 71mm Bore for Suzuki DS250 1980 380M07100
WISECO
$210.95If you're running a Suzuki DS250 and want to unlock additional displacement and power without a complete engine overhaul, this 1mm oversize Wiseco piston kit is your answer. The forged aluminum construction combined with precision ring design ensures...380M07100- SKU:
- 380M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 71.00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PISTON DIAMETER METRIC:
- 70.92 MM
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$210.95 -
Wiseco Piston Kit Suzuki TS250 1973-1981 70mm 380M07000
WISECO
$210.95Whether you're rebuilding a tired TS250 or maximizing output on an already-strong platform, a quality piston kit is foundational to reliable power delivery. Wiseco's 380M07000 delivers the precision bore diameter and material science necessary for...380M07000- SKU:
- 380M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.92 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 64.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$210.95Qty in Cart: 0Quantity:Price:$210.95Subtotal: -
Wiseco 89mm Ring Set for Honda CR500R 1984-2001 3504TD
WISECO
$54.95Piston ring degradation directly impacts combustion sealing, power output, and engine longevity—especially in high-performance 2-stroke applications like the CR500R. The Wiseco 3504TD ring set restores critical compression and blowby control with...3504TD- SKU:
- 3504TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 89.00 MM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$54.95Qty in Cart: 0Quantity:Price:$54.95Subtotal: -
Wiseco 85mm Piston Ring Set for Honda TRX400EX 1999-2008 3347XC
WISECO
$52.95Piston rings are critical to maintaining compression, controlling blow-by, and delivering consistent power output in your TRX400EX engine. Over time, factory rings wear and lose their sealing ability, resulting in lost horsepower, increased oil...3347XC- SKU:
- 3347XC
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- BORE SIZE METRIC:
- 85.00 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- STREET
- UNITS:
- SET
$52.95
