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
-
Wiseco Piston Kit with Gaskets for Kawasaki KX80 1988-1990 PK1296
WISECO
$179.95When you're pushing your KX80 to its limits, a worn or compromised top-end becomes your biggest bottleneck. The Wiseco Piston Kit delivers the compression stability and thermal control you need to...09030261- SKU:
- 09030261
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- DISPLACEMENT:
- 82 CC
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.80 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- MODEL:
- PRO-LITE
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit with Gaskets for 1986-2004 Honda XR250R PK1219
WISECO
$257.95Factory pistons wear out—especially in older Honda XR models that see aggressive riding or higher-than-stock compression builds. The Wiseco PK1219 restores lost compression and power while delivering...09030265- SKU:
- 09030265
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- PISTON DIAMETER METRIC:
- 72.95 MM
- PRODUCT NAME:
- REBUILD KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 59.50 MM
- BORE SIZE METRIC:
- 73.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
$257.95Qty in Cart: 0Quantity:Price:$257.95Subtotal: -
Wiseco Piston Kit 66mm Honda CR250R 1984-1985 526M06600
WISECO
$232.95The stock piston in your CR250R won't keep pace with serious trail or track work. This Wiseco kit restores lost compression, increases power output, and delivers the durability required for...526M06600- SKU:
- 526M06600
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
$232.95Qty in Cart: 0Quantity:Price:$232.95Subtotal: -
Wiseco Piston Kit 66.25mm Bore for 1985-1986 Honda ATC 250R 526M06625
WISECO
$204.95The Wiseco Piston Kit restores and elevates your ATC 250R's top-end performance with precision-engineered components built to handle sustained high-RPM operation. A quality piston kit is...526M06625- SKU:
- 526M06625
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- +0,25 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.25 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- BORE - OVERSIZE METRIC:
- +0.25 MM
- DISPLACEMENT:
- 248 CC
- STROKE LENGTH METRIC:
- 72.00 MM
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Piston 66.5mm Honda ATC 250R 1985-1986 526M06650
WISECO
$232.95The Wiseco 526M06650 piston delivers the precision and durability your Honda ATC250R needs to survive high-RPM abuse while maintaining consistent power delivery. Whether you're competing at the track...526M06650- SKU:
- 526M06650
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH:
- 72,00 MM
- BORE - OVERSIZE:
- +0,50 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.50 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
$232.95Qty in Cart: 0Quantity:Price:$232.95Subtotal: -
Wiseco Piston 66.75mm 1985-1986 Honda ATC 250R 526M06675
WISECO
$204.95If you're running a 1985-1986 Honda ATC250R, a worn or damaged piston directly kills your power output and engine reliability. Wiseco's forged-aluminum piston restores lost compression, sharpens...526M06675- SKU:
- 526M06675
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- STROKE LENGTH:
- 72,00 MM
- BORE - OVERSIZE METRIC:
- +0.75 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- BORE - OVERSIZE:
- +0,75 MM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 66.75 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- STROKE LENGTH METRIC:
- 72.00 MM
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco Piston Kit 67.25mm for 1986 Honda TRX250R 526M06725
WISECO
$229.95The Wiseco Piston Kit 67.25mm is engineered to restore or upgrade your 1986 Honda TRX250R with the precision and durability required for consistent power delivery in competitive or recreational...526M06725- SKU:
- 526M06725
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,25 MM
- BORE SIZE METRIC:
- 67.25 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +1.25 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
Wiseco Piston 1986 Honda TRX250R 67.25mm 526M06725
WISECO
$229.95A worn or damaged piston directly kills engine performance—causing compression loss, increased blow-by, and reduced power delivery. The Wiseco Pro-Lite Piston restores full combustion efficiency and...526M06750- SKU:
- 526M06750
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +1,50 MM
- BORE SIZE METRIC:
- 67.50 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 72,00 MM
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE - OVERSIZE METRIC:
- +1.50 MM
$229.95Qty in Cart: 0Quantity:Price:$229.95Subtotal: -
Wiseco Piston Kit 68.00 mm Bore Honda ATC 250 R 1985-1986 526M06800
WISECO
$232.95High-compression four-stroke engines demand pistons engineered for sustained peak RPM without compromise. The Wiseco Pro-Lite kit delivers the strength-to-weight ratio necessary for reliable...526M06800- SKU:
- 526M06800
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- BORE SIZE METRIC:
- 68.00 MM
- DISPLACEMENT:
- 246 CC
- PISTON MATERIAL:
- ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 72.00 MM
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
- BORE - OVERSIZE:
- +2,00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 72,00 MM
$232.95Qty in Cart: 0Quantity:Price:$232.95Subtotal: -
On Sale
Wiseco Suzuki RM250 1982-1985 Piston Kit 70.00mm 485M07000
WISECO
MSRP: $199.95Now: $170.00Was: $199.95The Wiseco RM250 piston kit delivers the precision and durability required for sustained high-RPM performance on both track and trail. Factory OEM pistons often compromise between longevity and peak...485M07000- SKU:
- 485M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH METRIC:
- 64.00 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.92 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $199.95Now: $170.00Was: $199.95 -
On Sale
Wiseco RM250 1982-1985 Piston Kit 70.50mm 485M07050
WISECO
MSRP: $199.95Now: $170.00Was: $199.95A worn or damaged piston directly limits your RM250's power output and throttle response—this Wiseco kit restores full compression and peak performance. Built with aircraft-grade alloy and...485M07050- SKU:
- 485M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 70.50 MM
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.42 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.00 MM
- UNITS:
- KIT
MSRP: $199.95Now: $170.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $170.00Was: $199.95Subtotal: -
On Sale
Wiseco Suzuki RM250 1982-1985 Piston Kit 485M07200
WISECO
MSRP: $224.95Now: $191.00Was: $224.95If you're running a 1982-1985 Suzuki RM250, piston wear is one of the first performance killers to address. The Wiseco 485M07200 kit restores compression, sharpens throttle response, and delivers the...485M07200- SKU:
- 485M07200
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 246 CC
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- BORE SIZE METRIC:
- 71.50 MM
- PISTON DIAMETER METRIC:
- 71.92 MM
- STROKE LENGTH METRIC:
- 64.00 MM
MSRP: $224.95Now: $191.00Was: $224.95Qty in Cart: 0Quantity:Price:MSRP: $224.95Now: $191.00Was: $224.95Subtotal: -
On Sale
Wiseco KX125 1982-1985 Piston Kit 486M05600
WISECO
MSRP: $154.95Now: $132.00Was: $154.95The Wiseco KX125 Piston Kit 486M05600 is engineered to restore or maximize your vintage Kawasaki's combustion efficiency and throttle response. If you're running worn or damaged pistons, this direct...486M05600- SKU:
- 486M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- DISPLACEMENT:
- 124 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- STROKE LENGTH METRIC:
- 50.60 MM
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Kit 1983-1985 Suzuki RM80 50.00mm 497M05000
WISECO
MSRP: $134.95Now: $115.00Was: $134.95If you're running a 1983–1985 Suzuki RM80 and want reliable power gains without sacrificing engine durability, the Wiseco Piston Kit is the foundation you need. Wiseco's precision-engineered pistons...497M05000- SKU:
- 497M05000
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 82,87 CC
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- STROKE LENGTH:
- 44,00 MM
- UNITS:
- EACH
- BORE - OVERSIZE:
- +1,00 MM
- STROKE LENGTH METRIC:
- 44.00 MM
- BORE SIZE METRIC:
- 50.00 MM
MSRP: $134.95Now: $115.00Was: $134.95Qty in Cart: 0Quantity:Price:MSRP: $134.95Now: $115.00Was: $134.95Subtotal: -
On Sale
Wiseco 1982-1983 Yamaha YZ80 48.00mm Piston Kit 477M04800
WISECO
MSRP: $134.95Now: $115.00Was: $134.95If you're running a YZ80 in competitive or high-demand conditions, a worn or compromised piston directly impacts throttle response, compression consistency, and overall engine reliability. The Wiseco...477M04800- SKU:
- 477M04800
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 48.00 MM
- PISTON DIAMETER METRIC:
- 47.95 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 79 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.60 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
MSRP: $134.95Now: $115.00Was: $134.95 -
On Sale
Wiseco Piston Standard Kawasaki KDX 220 R 1997-2005 750M06900
WISECO
MSRP: $199.95Now: $157.00Was: $199.95Stock pistons wear out—especially in a two-stroke like the KDX220. The Wiseco piston delivers the precision fit and durability you need to sustain peak power output through countless riding hours,...750M06900- SKU:
- 750M06900
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- BORE SIZE METRIC:
- 69.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- RIDING STYLE:
- OFF-ROAD
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 58.00 MM
- UNITS:
- EACH
- DISPLACEMENT:
- 216 CC
- STROKE LENGTH:
- 58,00 MM
MSRP: $199.95Now: $157.00Was: $199.95Qty in Cart: 0Quantity:Price:MSRP: $199.95Now: $157.00Was: $199.95Subtotal: -
On Sale
Wiseco Piston +1.00 mm Kawasaki KDX 220 R 1997-2005 750M07000
WISECO
MSRP: $209.95Now: $178.00Was: $209.95If you're running a KDX220R, the factory piston has limits—especially when you're pushing for more power and reliability in demanding conditions. This Wiseco +1.00mm oversized piston restores lost...750M07000- SKU:
- 750M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- DISPLACEMENT:
- 216 CC
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- PRODUCT NAME:
- PISTON
- STROKE LENGTH:
- 58,00 MM
- BORE SIZE METRIC:
- 70.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 58.00 MM
MSRP: $209.95Now: $178.00Was: $209.95Qty in Cart: 0Quantity:Price:MSRP: $209.95Now: $178.00Was: $209.95Subtotal: -
On Sale
Wiseco Piston Standard Yamaha YZ125 2007 765M05400
WISECO
MSRP: $184.95Now: $157.00Was: $184.95A worn or damaged piston directly compromises combustion efficiency, throttle response, and engine longevity—especially on a high-revving two-stroke like the YZ125. The Wiseco 765M05400 restores...765M05400- SKU:
- 765M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH:
- 54,50 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
MSRP: $184.95Now: $157.00Was: $184.95Qty in Cart: 0Quantity:Price:MSRP: $184.95Now: $157.00Was: $184.95Subtotal: -
On Sale
Wiseco Piston Standard KTM 125 SX 2005 740M05425
WISECO
MSRP: $154.95Now: $132.00Was: $154.95If you're running a KTM 125 SX and want measurable improvements in throttle response and engine reliability, a quality piston upgrade is one of the most direct paths to better performance. The Wiseco...740M05425- SKU:
- 740M05425
- Availability:
- Ships Same Business Day
- Weight:
- 0.42 LBS
- DISPLACEMENT:
- 125 CC
- ENGINE TYPE:
- 2-STROKE
- STROKE LENGTH:
- 54,00 MM
- STROKE LENGTH METRIC:
- 54.00 MM
- BORE SIZE METRIC:
- 54.25 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal: -
On Sale
Wiseco Piston Standard Kawasaki KX 125 1994 640M05400
WISECO
MSRP: $154.95Now: $132.00Was: $154.95Two-stroke performance demands precision at every level—and piston selection is non-negotiable. The Wiseco Standard Piston for your KX125 delivers the exact bore dimensions and combustion geometry...741M05400- SKU:
- 741M05400
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 54.50 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 124 CC
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- BORE SIZE METRIC:
- 54.00 MM
- STROKE LENGTH:
- 54,50 MM
MSRP: $154.95Now: $132.00Was: $154.95Qty in Cart: 0Quantity:Price:MSRP: $154.95Now: $132.00Was: $154.95Subtotal:
