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 Wrist Pin 16mm x 50mm Kawasaki KDX200 1986-2006 S255
WISECO
$22.99If you're running a KDX200 at the edge of its limits, piston reliability becomes non-negotiable. The Wiseco S255 wrist pin delivers the strength and thermal stability required for sustained high-RPM performance, while its precision engineering ensures a...S255- SKU:
- S255
- Availability:
- Ships Same Business Day
- Weight:
- 0.13 LBS
- APPLICATION:
- PISTON
- OUTSIDE DIAMETER METRIC:
- 16.00 MM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- LENGTH:
- 50 MM
- MATERIAL:
- ALUMINUM
- OUTSIDE DIAMETER:
- 16,00 MM
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- LENGTH METRIC:
- 50 MM
- MATERIAL:
- SILICONE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
$22.99Qty in Cart: 0Quantity:Price:$22.99Subtotal: -
Wiseco Wrist Pin 18mm x 2.200" 1981-1983 Honda CR250R S257
WISECO
$23.95The Wiseco S257 wrist pin is engineered for 1981-1983 Honda CR250R engines that demand reliability under extreme racing conditions. As a critical connecting component between your piston and connecting rod, a high-quality wrist pin directly impacts...S257- SKU:
- S257
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- LENGTH:
- 56 MM
- UNITS:
- EACH
- APPLICATION:
- PISTON
- MATERIAL:
- SILICONE
- OUTSIDE DIAMETER:
- 18,00 MM
- OUTSIDE DIAMETER METRIC:
- 18.00 MM
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- LENGTH METRIC:
- 56 MM
- MATERIAL:
- ALUMINUM
- PRODUCT NAME:
- WRIST PIN
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$23.95 -
Wiseco Piston Kit Suzuki RM-Z250 2010-2024 40007M07700
WISECO
$224.95The Wiseco 40007M07700 Piston Kit delivers the compression ratio and durability needed to unlock your RM-Z250's full potential, whether you're pushing hard on the track or tackling demanding terrain. Factory pistons are a compromise between cost and...09102888- SKU:
- 09102888
- Availability:
- Ships Same Business Day
- Weight:
- 0.57 LBS
- BORE SIZE METRIC:
- 77.00 MM
- DISPLACEMENT:
- 250 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- STROKE LENGTH METRIC:
- 53.60 MM
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 13.4:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Yamaha DT250 1974-1979 234M07000
WISECO
$210.95If you're running a Yamaha DT250 and want to reliably extract more power from your 2-stroke, a quality piston kit is non-negotiable. The Wiseco 234M07000 delivers the precision fit and durability you need to handle aggressive riding conditions without...234M07000- SKU:
- 234M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 64.00 MM
$210.95 -
Wiseco Piston Honda CRF450R 2002-2008 4171M07500
WISECO
$194.95The Wiseco 4171M07500 piston kit delivers the compression ratio and material durability your CRF450R needs to handle sustained high-RPM demands, whether you're pushing hard on the track or tackling technical terrain. Factory pistons compromise on heat...4171M07500- SKU:
- 4171M07500
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- PISTON DIAMETER METRIC:
- 74.95 MM
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 75.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- STREET
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 248 CC
- SKIRT COATING:
- NON-COATED
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 57.80 MM
$194.95Qty in Cart: 0Quantity:Price:$194.95Subtotal: -
Wiseco Piston Kit Standard Bore 55.94mm Honda CR125M 1974-1978 339M05600
WISECO
$154.95If you're running a Honda CR125M two-stroke, piston wear is inevitable—and when it happens, you need a direct replacement that matches OEM specifications without compromising performance. The Wiseco 339M05600 delivers exactly that: a precision-engineered...339M05600- SKU:
- 339M05600
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- BORE SIZE METRIC:
- 56.00 MM
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 55.94 MM
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco 67mm Piston Kit for Yamaha YT175 1982-1983 471M06700
WISECO
$154.95Your YT175's performance ceiling is directly tied to your piston's precision and durability. A worn or undersized piston compromises compression, throttle response, and engine longevity—especially in the punishing 2-stroke environment. The Wiseco...471M06700- SKU:
- 471M06700
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- ENGINE TYPE:
- 2-STROKE
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 67.00 MM
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 50.00 MM
- UNITS:
- KIT
- DISPLACEMENT:
- 172 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 66.95 MM
- SKIRT COATING:
- NON-COATED
$154.95Qty in Cart: 0Quantity:Price:$154.95Subtotal: -
Wiseco Piston Yamaha MT-09 2014-2025 Standard 452M07000
WISECO
$199.95If you're running a Yamaha MT-09 and pushing hard on the track or street, a worn piston directly kills your compression, throttle response, and fuel efficiency. The Wiseco 452M07000 restores full performance with CNC-machined precision and forged...452M07000- SKU:
- 452M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- DISPLACEMENT:
- 246 CC
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 64.00 MM
- UNITS:
- KIT
$199.95 -
Wiseco Piston Kit Yamaha YZ250 1980-1982 1mm Oversize 452M07100
WISECO
$199.95When your YZ250's piston is worn or damaged, you're losing compression, power, and reliability—exactly what you can't afford in competition or on the trail. The Wiseco 452M07100 replaces those losses with a forged aluminum piston engineered to withstand...452M07100- SKU:
- 452M07100
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- FORGED SERIES
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 246 CC
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 64.00 MM
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- BORE SIZE METRIC:
- 71.00 MM
- PISTON DIAMETER METRIC:
- 70.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
$199.95Qty in Cart: 0Quantity:Price:$199.95Subtotal: -
Wiseco Piston Kit Yamaha YZ250 1980-1982 1.25mm 452M07150
WISECO
$224.95The Wiseco 452M07150 is engineered for 2-stroke engines that demand reliability and power delivery across high RPM ranges. If you're running a Yamaha YZ250 or IT250, a worn piston directly impacts combustion efficiency, throttle response, and engine...452M07150- SKU:
- 452M07150
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- BORE - OVERSIZE:
- +1,25 MM
- DISPLACEMENT:
- 246 CC
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +1.25 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 71.45 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- MODEL:
- FORGED SERIES
- BORE SIZE METRIC:
- 71.50 MM
- STROKE LENGTH METRIC:
- 64.00 MM
$224.95Qty in Cart: 0Quantity:Price:$224.95Subtotal: -
Wiseco Piston Kit Honda XR650L 1993-2017 1mm Oversize 4562M10100
WISECO
$248.95If you're running a Honda XR650L and need to restore lost compression or rebuild after high-mileage wear, a quality piston kit is non-negotiable. The Wiseco 4562M10100 delivers OEM-spec fitment with forged 2618 alloy construction that handles sustained...4562M10100- SKU:
- 4562M10100
- Availability:
- Ships Same Business Day
- Weight:
- 1.40 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- COMPRESSION RATIO IMPERIAL:
- 8.7:1
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE SIZE METRIC:
- 101.00 MM
- DISPLACEMENT:
- 650 CC
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- +1,00 MM
- PISTON DIAMETER METRIC:
- 100.92 MM
- PRODUCT NAME:
- PISTON KIT
- STROKE LENGTH METRIC:
- 82.00 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
$248.95 -
Wiseco Piston Kit Racer Elite Kawasaki KX250F 2017-2019 RE811M07700
WISECO
$369.95If you're running a Kawasaki KX250F in competitive off-road conditions, piston wear directly impacts your power delivery and engine reliability. The Wiseco RE811M07700 Racer Elite kit replaces worn or damaged pistons with precision-engineered components...09105075- SKU:
- 09105075
- Availability:
- Ships Same Business Day
- Weight:
- 0.55 LBS
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
$369.95Qty in Cart: 0Quantity:Price:$369.95Subtotal: -
Wiseco Piston Kit Racer Elite YZ250F 2014-2016 RE812M07700
WISECO
$369.95If you're pushing your YZ250F to its limits on the track or trail, your stock piston won't cut it. The Wiseco RE812M07700 delivers the compression ratio and durability needed to handle competitive riding without sacrificing reliability. This complete kit...09105076- SKU:
- 09105076
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- SKIRT COATING:
- ARMORGLIDE®
- UNITS:
- KIT
- ENGINE TYPE:
- 4-STROKE
- RIDING STYLE:
- OFF-ROAD
$369.95 -
Wiseco Piston Kit Honda CR125R 1995-2003 RE908M05600
WISECO
$204.95The Wiseco Racer Elite RE908M05600 piston kit is purpose-built for the Honda CR125R engine, delivering the reliability and precision you need to stay competitive in 2-stroke racing. Wiseco's proven manufacturing process and advanced material composition...09105079- SKU:
- 09105079
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- BORE - OVERSIZE:
- +2,00 MM
- BORE SIZE METRIC:
- 56.00 MM
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
$204.95Qty in Cart: 0Quantity:Price:$204.95Subtotal: -
Wiseco 2-Stroke Piston Kit Honda CR250R 2002-2004 RE916M06640
WISECO
$277.95The Honda CR250R demands a piston that can handle the demands of competitive 2-stroke racing. Wiseco's RE916M06640 piston kit delivers the strength and thermal stability required to maintain peak performance lap after lap, while ArmorPlating technology...09105083- SKU:
- 09105083
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORFIT™
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- BORE SIZE METRIC:
- 66.40 MM
$277.95Qty in Cart: 0Quantity:Price:$277.95Subtotal: -
Wiseco Piston Kit 47mm for KTM 85 SX 2003-2025 RE910M04700
WISECO
$171.95If you're running a KTM 85 SX and want reliable power delivery without compromise, a quality piston kit is non-negotiable. The Wiseco RE910M04700 combines precision engineering with proven durability, giving you the thermal stability and ring sealing you...09105085- SKU:
- 09105085
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- PISTON MATERIAL:
- 2000 SERIES ALLOY
- PISTON MATERIAL:
- FORGED
- BORE SIZE METRIC:
- 47.00 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- RACER ELITE
- UNITS:
- KIT
- SKIRT COATING:
- ARMORFIT™
$171.95 -
Wiseco Honda XR200 1980-1983 66mm Piston Kit with Gaskets PK1117
WISECO
$204.95When your XR200's top-end wears, a quality piston kit is non-negotiable for restoring compression, throttle response, and reliability. The Wiseco PK1117 delivers aerospace-grade forged aluminum construction paired with precision engineering—exactly what...09030172- SKU:
- 09030172
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- BORE - OVERSIZE:
- +0,50 MM
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.00 MM
- PRODUCT NAME:
- REBUILD KIT
- TYPE:
- TOP END
- PISTON DIAMETER METRIC:
- 65.95 MM
- RIDING STYLE:
- OFF-ROAD
- DISPLACEMENT:
- 192 CC
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
$204.95 -
Wiseco Piston Kit 48mm Bore for 2004-2008 Honda CRF80F PK1225
WISECO
$187.95When your CRF80F's factory piston shows wear, you lose compression, responsiveness, and the consistency you need on the track or trail. The Wiseco PK1225 restores full engine potential with a forged-aluminum piston engineered to OEM specifications,...09030173- SKU:
- 09030173
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.00 MM
- BORE SIZE METRIC:
- 48.00 MM
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- ENGINE TYPE:
- 4-STROKE
- PISTON DIAMETER METRIC:
- 47.97 MM
- PRODUCT NAME:
- REBUILD KIT
$187.95Qty in Cart: 0Quantity:Price:$187.95Subtotal: -
Wiseco Piston Kit 48.5mm Bore for 1993-2003 Honda XR80R PK1226
WISECO
$179.95When a 2-stroke engine is running on a worn or damaged piston, you're losing power, efficiency, and reliability on every ride. The Wiseco PK1226 restores your XR80R to peak performance with OEM-quality components engineered to handle the demands of...09030174- SKU:
- 09030174
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE - OVERSIZE METRIC:
- +1.00 MM
- BORE SIZE METRIC:
- 48.50 MM
- PISTON DIAMETER METRIC:
- 48.47 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
- DISPLACEMENT:
- 79.7 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 45.00 MM
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- COMPRESSION RATIO IMPERIAL:
- 9.7:1
- ENGINE TYPE:
- 4-STROKE
- PRODUCT NAME:
- REBUILD KIT
$179.95Qty in Cart: 0Quantity:Price:$179.95Subtotal: -
Wiseco Piston Kit 66mm 10:1 Compression Honda XR200R 1986-1991 PK1121
WISECO
$204.95If you're rebuilding your Honda XR200R's top end, piston selection directly impacts throttle response, reliability, and how much power you can extract from the motor. The Wiseco PK1121 delivers the precision engineering and durability expected from a...09030211- SKU:
- 09030211
- Availability:
- Ships Same Business Day
- Weight:
- 1.15 LBS
- PISTON DIAMETER METRIC:
- 65.95 MM
- PRODUCT NAME:
- REBUILD KIT
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- COMPRESSION RATIO IMPERIAL:
- 10.0:1
- DISPLACEMENT:
- 192 CC
- PISTON MATERIAL:
- 2618 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 57.80 MM
- BORE - OVERSIZE:
- +0,50 MM
- BORE - OVERSIZE METRIC:
- +0.50 MM
- BORE SIZE METRIC:
- 66.00 MM
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- TOP END
- UNITS:
- KIT
$204.95
