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
-
VERTEX Piston Kit - High Compression VTKTC23855B
VERTEX
$354.95If you're building a high-compression engine that demands reliability under sustained load, the VERTEX Piston Kit VTKTC23855B delivers the durability and precision required for serious racing applications. These pistons are engineered to withstand...09103803- SKU:
- 09103803
- Availability:
- Ships Same Business Day
- Weight:
- 2.40 LBS
$354.95 -
VERTEX Piston Kit 23679B
VERTEX
$236.95A piston kit is only as reliable as its material composition and heat treatment—factors that directly impact engine longevity under sustained high RPM and boost conditions. The VERTEX Piston Kit 23679B delivers precision-engineered pistons with T-5 heat...09102585- SKU:
- 09102585
- Availability:
- Ships Same Business Day
- Weight:
- 0.59 LBS
- BORE - OVERSIZE:
- +3,00 MM
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- CYLINDER DIAMETER METRIC:
- 80.00 MM
- DISPLACEMENT:
- 270 CC
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +3.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- PRODUCT NAME:
- PISTON KIT
$236.95 -
VERTEX Piston Kit 23711A
VERTEX
$302.95Whether you're rebuilding a tired engine or pushing higher compression ratios for competition, the VERTEX Piston Kit 23711A delivers the durability and precision needed for reliable power across the entire RPM range. VERTEX's commitment to...09102593- SKU:
- 09102593
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
$302.95 -
VERTEX Piston Kit 23653B
VERTEX
$315.95Whether you're rebuilding a two-stroke or four-stroke engine, piston selection directly impacts durability, power delivery, and longevity under sustained load. The VERTEX Piston Kit 23653B delivers OEM-quality construction with forged aluminum strength...09102040- SKU:
- 09102040
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- BORE - OVERSIZE METRIC:
- +3.20 MM
- CYLINDER DIAMETER METRIC:
- 80 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 79.97 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- +3,20 MM
- COMPRESSION RATIO IMPERIAL:
- 13.2:1
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STYLE:
- FORGED BIG BORE
- DISPLACEMENT:
- 270 CC
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
$315.95 -
VERTEX Piston Kit 23637B
VERTEX
$171.95The VERTEX Piston Kit 23637B delivers reliable, high-performance pistons engineered for extended engine life and consistent power delivery. Whether you're rebuilding a worn top end or upgrading to higher compression, VERTEX pistons combine precision...09102048- SKU:
- 09102048
- Availability:
- Ships Same Business Day
- Weight:
- 0.34 LBS
- PISTON DIAMETER METRIC:
- 48.45 MM
- PRODUCT NAME:
- PISTON KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 48.50 MM
- DISPLACEMENT:
- 85 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$171.95 -
VERTEX Piston Kit VTK22863B-1
VERTEX
$150.95A piston kit is the heart of your engine's combustion cycle—and VERTEX engineered the VTK22863B-1 to deliver the reliability and precision that separates consistent power from catastrophic failure. The advanced T-5 heat treatment process ensures your...09103027- SKU:
- 09103027
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 85 CC
- STYLE:
- CAST REPLICA
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 47.45 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 47.50 MM
- PRODUCT NAME:
- TOP END PISTON KIT
$150.95 -
VERTEX Piston Kit VTKTC23003A
VERTEX
$341.95Piston failure cuts racing short and empties wallets fast. The VERTEX Piston Kit VTKTC23003A delivers the durability and precision needed for sustained high-RPM performance, with advanced metallurgy and coatings engineered to withstand extreme combustion...09103727- SKU:
- 09103727
- Availability:
- Ships Same Business Day
- Weight:
- 2.30 LBS
$341.95Qty in Cart: 0Quantity:Price:$341.95Subtotal: -
VERTEX Piston Kit - Standard 23375B
VERTEX
$254.95Engine durability and longevity depend on pistons that can withstand extreme combustion pressures and thermal cycling without compromise. The VERTEX Piston Kit 23375B delivers the precision engineering and material science required for reliable...09101002- SKU:
- 09101002
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- CYLINDER DIAMETER METRIC:
- 72.00 MM
- PRODUCT NAME:
- PISTON KIT
- ENGINE TYPE:
- 2-STROKE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 300 CC
- PISTON DIAMETER METRIC:
- 71.95 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$254.95 -
VERTEX Piston Ring 53010003950
VERTEX
$25.95Piston rings are wear items that demand replacement to maintain compression, oil control, and engine efficiency. The VERTEX Piston Ring 53010003950 delivers the durability and precision fit your engine needs, whether you're running a two-stroke or...09120346- SKU:
- 09120346
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 90.45 MM
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 90.50 MM
- UNITS:
- SET
$25.95 -
VERTEX Piston Kit - Standard 23429CD
VERTEX
$99.95Precision-engineered pistons are the foundation of reliable high-RPM performance, and the VERTEX Standard 23429CD delivers the durability required for sustained boost and aggressive tuning. Built with advanced metallurgy and surface treatments, these...09102065- SKU:
- 09102065
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 50 CC
- PISTON DIAMETER METRIC:
- 39.47 MM
- UNITS:
- KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 39.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$99.95 -
VERTEX Piston Kit 24101B
VERTEX
$223.95The VERTEX Piston Kit 24101B delivers the reliability and performance precision you need for consistent power delivery across the entire RPM range. Whether you're rebuilding a tired top end or stepping up displacement and compression, VERTEX pistons are...09104071- SKU:
- 09104071
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- DISPLACEMENT:
- 150 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 57.97 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 58 MM
- PRODUCT NAME:
- PISTON KIT
- STYLE:
- CAST REPLICA
$223.95 -
VERTEX Piston Kit - Standard 22646B
VERTEX
$235.95The VERTEX Piston Kit 22646B delivers the durability and precision your engine demands, whether you're chasing lap times or building a reliable long-term platform. Purpose-engineered with advanced heat treatment and a low-friction coating, these pistons...09100951- SKU:
- 09100951
- Availability:
- Ships Same Business Day
- Weight:
- 0.73 LBS
- PISTON DIAMETER METRIC:
- 66.35 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$235.95Qty in Cart: 0Quantity:Price:$235.95Subtotal: -
VERTEX Piston Kit - Standard 22387B
VERTEX
$208.95A quality piston kit is the foundation of reliable engine performance, and the VERTEX Piston Kit 22387B delivers the durability and precision you need for consistent power delivery and extended engine life. The advanced heat-treatment process and...09101032- SKU:
- 09101032
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 66.35 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- STYLE:
- CAST REPLICA
$208.95 -
VERTEX Piston Kit 23335B
VERTEX
$189.95A piston kit is only as good as its material composition and heat treatment process—this VERTEX 23335B delivers both. These pistons are engineered to handle sustained high-RPM loads and thermal cycling without degradation, making them ideal for...09102117- SKU:
- 09102117
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- FORGED RACE
- BORE - OVERSIZE:
- +4,00 MM
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 58.00 MM
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- BORE - OVERSIZE METRIC:
- +4.00 MM
- DISPLACEMENT:
- 144 CC
- PISTON DIAMETER METRIC:
- 57.96 MM
- PRODUCT NAME:
- PISTON KIT
$189.95 -
Wiseco Ring Set 47mm Yamaha PW80 1991-2006 1850CD
WISECO
$52.95Piston rings are the critical seal between your combustion chamber and crankcase—worn or inadequate rings kill compression, increase blow-by, and tank engine efficiency. The Wiseco 1850CD ring set is precision-engineered to maintain optimal sealing on...1850CD- SKU:
- 1850CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- SET
- BORE SIZE METRIC:
- 47.00 MM
- PRODUCT NAME:
- PISTON RING
$52.95 -
Wiseco Piston Ring Set 47mm Honda CR80R 1986-2002 1850CS
WISECO
$25.95Worn or damaged piston rings kill engine sealing, causing compression loss, blow-by, and poor performance—especially critical in a high-revving 2-stroke like the CR80R. The Wiseco 1850CS ring set restores proper ring-to-bore contact, ensuring consistent...1850CS- SKU:
- 1850CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- DISPLACEMENT:
- 82,9 CC
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- 47.00 MM
- UNITS:
- SET
$25.95 -
Wiseco 47.50mm Piston Ring Set for Yamaha BW80 1986-1990 1869CD
WISECO
$52.95Piston rings are critical to engine sealing and compression integrity—worn or improper rings lead to blow-by, oil consumption, and power loss. The Wiseco 1869CD ring set delivers precision engineering and material durability to restore or upgrade your...1869CD- SKU:
- 1869CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- BORE SIZE METRIC:
- 47.50 MM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- SET
$52.95Qty in Cart: 0Quantity:Price:$52.95Subtotal: -
Wiseco Piston Ring Set 47.5mm for Honda CR80R 1986-2002 1869CS
WISECO
$25.95Keep your CR80R's combustion chamber sealed tight and your oil where it belongs—in the crankcase, not the exhaust. A worn piston ring set kills compression, tanks fuel economy, and accelerates engine wear. The Wiseco 1869CS delivers the precision fit and...1869CS- SKU:
- 1869CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 82,9 CC
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- BORE SIZE METRIC:
- 47.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$25.95 -
Wiseco 48mm Piston Ring Set for Honda CR80R 1986-2002 1890CS
WISECO
$25.95A properly sealed combustion chamber is critical for maximizing horsepower and engine longevity on your CR80R. Wiseco's precision-engineered piston ring set delivers the compression consistency and blow-by reduction needed for reliable performance,...1890CS- SKU:
- 1890CS
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- BORE SIZE METRIC:
- 48.00 MM
- DISPLACEMENT:
- 82,9 CC
- UNITS:
- SET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$25.95 -
Wiseco 48.5mm Piston Ring Set for Kawasaki KX85 2001-2013 1909CD
WISECO
$52.95Worn or damaged piston rings directly compromise combustion sealing, reducing power output and increasing blow-by—both performance killers on the track or trail. The Wiseco 1909CD delivers precision-engineered ring geometry that restores optimal...1909CD- SKU:
- 1909CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- BORE SIZE METRIC:
- 48.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 82,9 CC
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
$52.95
