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!
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On Sale
Wiseco 68mm Piston Ring Set for Arctic Cat Cheetah Touring 1991-1993 2677CD
WISECO
MSRP: $52.95Now: $42.00Was: $52.95Worn or damaged piston rings compromise compression, increase blow-by, and rob your Arctic Cat Cheetah of power and fuel efficiency. The Wiseco 2677CD ring set restores proper sealing and combustion chamber integrity, giving you the performance and...2677CD- SKU:
- 2677CD
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- DISPLACEMENT:
- 195 CC
- RIDING STYLE:
- ATV
- DISPLACEMENT:
- 246,8 CC
- UNITS:
- SET
- BORE SIZE METRIC:
- 68.00 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- WATERCRAFT
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON RING
MSRP: $52.95Now: $42.00Was: $52.95 -
On Sale
Wiseco Piston Ring Set 79mm Bore for Suzuki DR350 1990-1999 3110XG
WISECO
MSRP: $52.95Now: $42.00Was: $52.95Piston rings are critical to maintaining proper compression and oil control in your engine—worn or damaged rings lead to blow-by, loss of power, and increased fuel consumption. The Wiseco 3110XG ring set delivers OEM-quality sealing with proven...3110XG- SKU:
- 3110XG
- Availability:
- Ships Same Business Day
- Weight:
- 0.02 LBS
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- STREET
- UNITS:
- SET
- PRODUCT NAME:
- PISTON RING
- BORE SIZE METRIC:
- 79.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
MSRP: $52.95Now: $42.00Was: $52.95 -
On Sale
Wiseco 82.00mm 2-Stroke Piston Ring Set for Arctic Cat Wildcat 700 1991-1993 3228TD
WISECO
MSRP: $57.95Now: $47.00Was: $57.95A worn or damaged piston ring set robs your Arctic Cat Wildcat 700 of compression, throttle response, and overall engine efficiency. The Wiseco 3228TD ring set restores that critical seal between piston and cylinder wall, ensuring maximum combustion...3228TD- SKU:
- 3228TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- BORE SIZE METRIC:
- 82.00 MM
- PRODUCT NAME:
- PISTON RING
- UNITS:
- SET
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
Wiseco Ring Set 83.50mm for Polaris Xplorer 400 4x4 1995-2001 3287TD
WISECO
MSRP: $57.95Now: $47.00Was: $57.95Worn or damaged piston rings are a silent killer of engine performance—they allow blow-by, rob you of compression, and accelerate wear on your cylinder walls. The Wiseco 3287TD ring set restores proper sealing and combustion efficiency in your Polaris...3287TD- SKU:
- 3287TD
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- UNITS:
- SET
- BORE SIZE METRIC:
- 83.50 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- ATV
MSRP: $57.95Now: $47.00Was: $57.95 -
On Sale
WISECO Piston Kit with Gaskets PK1399
WISECO
MSRP: $334.95Now: $276.00Was: $334.95The stock piston in your RM-Z450 is a compromise between cost and durability—fine for casual riding, but it limits your engine's potential and can't handle sustained high-RPM abuse. The Wiseco PK1399 replaces that limitation with a purpose-built piston...09030569- SKU:
- 09030569
- Availability:
- Ships Same Business Day
- Weight:
- 1.90 LBS
- BORE SIZE METRIC:
- 95.50 MM
- MODEL:
- FORGED SERIES
- ENGINE TYPE:
- 4-STROKE
- TYPE:
- TOP END
- DISPLACEMENT:
- 450 CC
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 62.80 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 12.0:1
- PISTON DIAMETER METRIC:
- 95.44 MM
- PRODUCT NAME:
- REBUILD KIT
- SKIRT COATING:
- ARMORGLIDE®
MSRP: $334.95Now: $276.00Was: $334.95 -
On Sale
Wiseco Piston Kit 67.50mm 0.50mm Oversize for Suzuki RM250 1977-1981 405M06750
WISECO
MSRP: $199.95Now: $170.00Was: $199.95A worn or damaged piston compromises combustion efficiency and robs your RM250 of power and responsiveness. The Wiseco 67.50mm oversize piston kit restores your engine to peak performance with precision-engineered components built to withstand the...405M06750- SKU:
- 405M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE SIZE METRIC:
- 67.50 MM
- DISPLACEMENT:
- 246 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 67.44 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $199.95Now: $170.00Was: $199.95 -
On Sale
Wiseco Piston Kit Yamaha YZ250F 2008-2011 4952M07700
WISECO
MSRP: $279.95Now: $238.00Was: $279.95The Wiseco Piston Kit is engineered to deliver measurable gains in acceleration, throttle response, and overall engine reliability for your YZ250F. High-silicon aluminum construction resists thermal expansion and detonation, critical for maintaining...09102936- SKU:
- 09102936
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE:
- +6,00 MM
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE METRIC:
- +6.00 MM
- BORE SIZE METRIC:
- 83.00 MM
- COMPRESSION RATIO IMPERIAL:
- 12.5:1
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
MSRP: $279.95Now: $238.00Was: $279.95 -
On Sale
Wiseco Piston Kit for Honda XR650L 1993-2021 4989M10000
WISECO
MSRP: $248.95Now: $204.00Was: $248.95The Wiseco Piston Kit is engineered for riders who need reliable, consistent performance from their Honda XR650L across all conditions—from high-altitude trails to sustained highway cruising. Wiseco's precision-forged aluminum construction delivers the...09102939- SKU:
- 09102939
- Availability:
- Ships Same Business Day
- Weight:
- 1.45 LBS
- BORE SIZE METRIC:
- 100.00 MM
- STROKE LENGTH METRIC:
- 82.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 650 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
MSRP: $248.95Now: $204.00Was: $248.95 -
On Sale
Wiseco Piston Kit 2.00mm Oversize 58.00mm Bore Yamaha YZ125 1976-1982 435M05800
WISECO
MSRP: $179.95Now: $153.00Was: $179.95Yamaha YZ125 owners running 1976–1982 models face inevitable piston wear under competitive riding conditions. The Wiseco 435M05800 kit addresses this head-on with a 2.00mm oversize bore and precision-engineered construction that restores lost compression...435M05800- SKU:
- 435M05800
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- BORE SIZE METRIC:
- 58.00 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 57.95 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 123 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $179.95Now: $153.00Was: $179.95 -
On Sale
Wossner Connecting Rod Kawasaki KX500 1989-2004 P2039
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00If you're rebuilding a KX500 engine, the connecting rod is non-negotiable—it transfers combustion force directly to your crankshaft and must withstand extreme stress cycle after cycle. The Wossner P2039 kit eliminates guesswork by providing...09230417- SKU:
- 09230417
- Availability:
- Ships Same Business Day
- Weight:
- 1.35 LBS
- UNITS:
- KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
MSRP: $152.00Now: $144.40Was: $152.00 -
On Sale
Wossner 50 SX 2007-2023 Connecting Rod P2053
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The Wossner P2053 connecting rod delivers the structural integrity and precision tolerances your 50 SX engine demands for sustained high-RPM performance. Whether you're rebuilding after a failure or upgrading for reliability, this German-engineered...09230419- SKU:
- 09230419
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- STYLE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Connecting Rod Kit for KTM 85 SX 2013-2025 P2065
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The stock connecting rod on your KTM 85 SX experiences extreme loads during aggressive riding and racing. This Wössner kit replaces factory components with forged 8620 alloy rods that deliver measurably higher fatigue resistance and reliability through...09230426- SKU:
- 09230426
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- PRODUCT NAME:
- CONNECTING ROD KIT
- STYLE:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Connecting Rod Kawasaki KX250F 2004-2009 P4002
WOSSNER
MSRP: $174.00Now: $165.30Was: $174.00A connecting rod failure mid-race or mid-rebuild can set you back weeks and hundreds of dollars. The Wössner P4002 kit eliminates that risk by delivering the precision engineering and material science necessary for a bulletproof crankshaft rebuild on...09230429- SKU:
- 09230429
- Availability:
- Ships Same Business Day
- Weight:
- 1.30 LBS
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- CONNECTING ROD KIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- STYLE:
- STANDARD
MSRP: $174.00Now: $165.30Was: $174.00 -
On Sale
Wossner Piston Kit 47.47mm Yamaha YZ85 2002-2025 8104DC
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00The Wossner Piston Kit 8104DC is engineered for serious YZ85 builders who demand reliability under sustained high-RPM conditions. A worn or compromised piston directly impacts combustion efficiency, throttle response, and engine longevity—this complete...09104834- SKU:
- 09104834
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON SIZE METRIC:
- 47.47 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.02 MM
- BORE SIZE METRIC:
- 47.52 MM
- MODEL:
- STANDARD SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,02 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- FORGED
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Piston Kit KTM 85 SX 2003-2025 8147DA
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00When you're pushing a KTM 85 SX to its limits, stock pistons become your limiting factor. The Wossner 8147DA kit delivers the durability and thermal stability required for consistent power across multiple heat cycles, whether you're racing competitively...09104847- SKU:
- 09104847
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- PISTON SIZE METRIC:
- 46.95 MM
- TYPE:
- SINGLE RING
- UNITS:
- KIT
- MODEL:
- STANDARD SERIES
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 47.00 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- FORGED
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Piston Kit 46.96mm for KTM 85 SX 2003-2023 8147DB
WOSSNER
MSRP: $112.00Now: $106.40Was: $112.00When you're pushing a KTM 85 SX to its limits, a worn or failing piston compromises power delivery and reliability. The Wossner 8147DB gives you a factory-quality replacement with German engineering and advanced friction-reducing coatings that...09104848- SKU:
- 09104848
- Availability:
- Ships Same Business Day
- Weight:
- 0.36 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- DISPLACEMENT:
- 84 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 46.96 MM
- TYPE:
- SINGLE RING
- BORE SIZE METRIC:
- 47.01 MM
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
MSRP: $112.00Now: $106.40Was: $112.00 -
On Sale
Wossner Piston Kit KTM 450 SX-F 2013-2022 8873DB
WOSSNER
MSRP: $244.00Now: $231.80Was: $244.00If you're running your KTM 450 SX-F hard—whether on the track or the trail—your piston is working at the absolute edge of its limits. A quality piston kit isn't just a maintenance item; it's the foundation of reliable power delivery, reduced friction...09106126- SKU:
- 09106126
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- 13.6:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 94.96 MM
- BORE SIZE METRIC:
- 95.01 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $244.00Now: $231.80Was: $244.00 -
Vertex Complete Engine Rebuild Kit for Yamaha YZ250 2003-2025 WR101-082
WRENCH RABBIT
$867.95When your YZ250 two-stroke takes a beating on the track or trail, a complete engine rebuild demands precision components across every critical system. The Vertex Complete Engine Rebuild Kit eliminates the guesswork of sourcing individual parts by...09031017- SKU:
- 09031017
- Availability:
- Ships Same Business Day
- Weight:
- 13.20 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- WRENCH RABBIT
- FEATURES:
- STANDARD COMPRESSION PISTON
$867.95 -
Wrench Rabbit Yamaha YZ250F 2003-2004 Complete Engine Rebuild Kit WR101-083
WRENCH RABBIT
$1,157.95When your YZ250F's engine has logged serious hours, a complete rebuild is the only way to restore original performance and reliability. The Wrench Rabbit complete engine rebuild kit eliminates the guesswork of sourcing individual components—everything...09031018- SKU:
- 09031018
- Availability:
- Ships Same Business Day
- Weight:
- 13.05 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
- RIDING STYLE:
- OFF-ROAD
- FEATURES:
- STANDARD COMPRESSION PISTON
- UNITS:
- KIT
$1,157.95 -
Wrench Rabbit Complete Engine Rebuild Kit for 2005-2007 Yamaha YZ250F WR101-084
WRENCH RABBIT
$1,157.95When your Yamaha YZ250F's engine reaches the end of its service life, a complete rebuild restores it to factory specifications and performance reliability. The Wrench Rabbit WR101-084 kit consolidates every critical component you'll need—pistons,...09031019- SKU:
- 09031019
- Availability:
- Ships Same Business Day
- Weight:
- 13.25 LBS
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- WRENCH RABBIT
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- FEATURES:
- STANDARD COMPRESSION PISTON
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- ENGINE
$1,157.95
