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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Wiseco Piston Kit 52mm 2003-2018 KTM 85/105 SX 855M05200
WISECO
$177.95Two-stroke engines demand precision components that can handle extreme combustion pressures and heat cycles. The Wiseco Piston Kit 855M05200 delivers exactly that—a CNC-machined, high-silicon...09030587- SKU:
- 09030587
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 104 CC
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- ARMORGLIDE®
- STROKE LENGTH METRIC:
- 48.95 MM
- BORE SIZE METRIC:
- 52.00 MM
- ENGINE TYPE:
- 2-STROKE
$177.95 -
Wiseco 200 EXC 1998-2016 Piston Kit 2.00mm Oversize 770M06600
WISECO
$184.95If you're running a KTM 200 EXC between 1998-2016 and want to reclaim lost compression and restore factory performance, a piston replacement is essential maintenance. This Wiseco kit delivers...09100776- SKU:
- 09100776
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- FORGED
- PRODUCT NAME:
- PISTON
- STROKE LENGTH METRIC:
- 60.00 MM
- BORE SIZE METRIC:
- 66.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- UNITS:
- EACH
- BORE - OVERSIZE METRIC:
- +2.00 MM
- DISPLACEMENT:
- 193 CC
- ENGINE TYPE:
- 2-STROKE
- MODEL:
- PRO-LITE
- RIDING STYLE:
- OFF-ROAD
$184.95 -
Wiseco Piston Kit 66.40mm for KTM 250 SX 2005-2016 856M06640
WISECO
$205.95A worn or stock piston limits your KTM 250's potential—this Wiseco kit restores compression, improves throttle response, and delivers the reliability needed for sustained high-RPM performance...09100778- SKU:
- 09100778
- Availability:
- Ships Same Business Day
- Weight:
- 0.71 LBS
- PISTON MATERIAL:
- FORGED
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON
- RIDING STYLE:
- STREET
- SKIRT COATING:
- ARMORGLIDE®
- DISPLACEMENT:
- 249 CC
- STROKE LENGTH METRIC:
- 72.00 MM
- BORE SIZE METRIC:
- 66.40 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
$205.95 -
Wiseco Piston Kit 0.50mm Oversize 70.00mm Bore Husqvarna CR250 WR250 1974-1984 137M07000
WISECO
$199.95Stock pistons are engineered for longevity, not peak performance—and every heat cycle pushes them closer to failure. The Wiseco Piston Kit delivers the precision engineering and premium materials...137M07000- SKU:
- 137M07000
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE METRIC:
- +0.50 MM
- STROKE LENGTH METRIC:
- 64.50 MM
- BORE SIZE METRIC:
- 70.00 MM
- PISTON DIAMETER METRIC:
- 69.95 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 244.70 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- BORE - OVERSIZE:
- +0,50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$199.95 -
Wiseco Husqvarna CR250 1974-1984 1.0mm Piston Kit 137M07050
WISECO
$199.95The Wiseco Husqvarna CR250 Piston Kit delivers the precision engineering your classic machine needs to run at peak efficiency. A worn or stock piston limits your engine's potential—this high-silicon...137M07050- SKU:
- 137M07050
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- +1,00 MM
- BORE - OVERSIZE METRIC:
- +1.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
- DISPLACEMENT:
- 244.70 CC
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- STROKE LENGTH METRIC:
- 64.50 MM
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE SIZE METRIC:
- 70.50 MM
- MODEL:
- FORGED SERIES
- PISTON DIAMETER METRIC:
- 70.45 MM
$199.95 -
Wiseco Piston Kit 56.5mm for 1982-1984 Honda CR125R 448M05650
WISECO
$162.95If you're running a CR125R hard on the track or trail, piston wear directly impacts your power delivery and engine reliability. The Wiseco 56.5mm piston kit restores—or exceeds—OEM performance with...448M05650- SKU:
- 448M05650
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE SIZE METRIC:
- 56.50 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 56.44 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE METRIC:
- +1.00 MM
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- DISPLACEMENT:
- 120 CC
- BORE - OVERSIZE:
- +1,00 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- STROKE LENGTH METRIC:
- 50.00 MM
- UNITS:
- KIT
$162.95 -
Wiseco Piston Kit Honda CR125R 1979-1984 57.5mm Bore 448M05750
WISECO
$179.95If you're running a CR125R between 1979 and 1984, piston wear directly impacts throttle response, power delivery, and engine longevity. The Wiseco 448M05750 replaces worn or damaged pistons with a...448M05750- SKU:
- 448M05750
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 57.44 MM
- PRODUCT NAME:
- PISTON KIT
- DISPLACEMENT:
- 123 CC
- MODEL:
- FORGED SERIES
- SKIRT COATING:
- NON-COATED
- STROKE LENGTH METRIC:
- 50.00 MM
- BORE - OVERSIZE:
- +2,00 MM
- DISPLACEMENT:
- 120 CC
- BORE SIZE METRIC:
- 57.50 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
$179.95 -
Wiseco Piston Honda CB500F 2013-2025 4466M07300
WISECO
$210.95If you're running a Honda CB500F and want to extract measurable gains in power and reliability, a quality piston upgrade is one of the most direct paths to getting there. Wiseco's forged-aluminum...4466M07300- SKU:
- 4466M07300
- Availability:
- Ships Same Business Day
- Weight:
- 0.65 LBS
- BORE SIZE METRIC:
- 73.00 MM
- COMPRESSION RATIO IMPERIAL:
- 10.5:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 72.95 MM
- PISTON MATERIAL:
- FORGED 2618 ALUMINUM
- STROKE LENGTH METRIC:
- 59.50 MM
- BORE - OVERSIZE:
- STANDARD
- DISPLACEMENT:
- 250 CC
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- FORGED SERIES
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- NON-COATED
$210.95 -
Wiseco Piston Kit Racer Elite Kawasaki KX250F 2015-2016 RE801M07700
WISECO
$369.95If you're serious about maximizing your KX250F's output, a quality piston kit is non-negotiable. Wiseco's Racer Elite design delivers measurable gains in throttle response and mid-range power while...09105070- SKU:
- 09105070
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- BORE SIZE METRIC:
- 77.00 MM
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORGLIDE®
$369.95 -
WISECO Piston Kit - Racer Elite - YZ250F RE802M07700
WISECO
$369.95If you're running a YZ250F, YZ250FX, or WR250F and want measurable power gains without sacrificing reliability, the Wiseco Racer Elite piston kit is engineered to deliver both. The 14.5:1 compression...09105071- SKU:
- 09105071
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE:
- STANDARD
- BORE SIZE METRIC:
- 77.00 MM
- COMPRESSION RATIO IMPERIAL:
- 14.5:1
- ENGINE TYPE:
- 4-STROKE
- BORE - OVERSIZE METRIC:
- STANDARD
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- ARMORGLIDE®
$369.95 -
Wiseco Piston Kit Suzuki RM80 1977-1981 456M04900
WISECO
$135.95The Wiseco 456M04900 piston kit is engineered to restore or upgrade your Suzuki RM80's top-end performance with precision-machined components built to handle the demands of aggressive riding. If...456M04900- SKU:
- 456M04900
- Availability:
- Ships Same Business Day
- Weight:
- 0.35 LBS
- BORE SIZE METRIC:
- 49.00 MM
- DISPLACEMENT:
- 79 CC
- ENGINE TYPE:
- 2-STROKE
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- STANDARD
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON DIAMETER METRIC:
- 48.95 MM
- PISTON MATERIAL:
- 4032 ALUMINUM ALLOY
- MODEL:
- FORGED SERIES
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- STROKE LENGTH METRIC:
- 42.00 MM
- RIDING STYLE:
- OFF-ROAD
- SKIRT COATING:
- NON-COATED
- UNITS:
- KIT
$135.95 -
WORKS CONNECTION Oil Plug 24-002
WORKS CONNECTION
$32.95Stock plastic oil plugs are prone to stripping, cracking, and leaking—especially under the vibration and heat of track use. The WORKS CONNECTION Oil Plug 24-002 replaces that liability with a...09500086- SKU:
- 09500086
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- BASE COLOR:
- BLUE
- UNITS:
- EACH
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLUE
- MATERIAL:
- 6061 T-6 ALUMINUM
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$32.95 -
WORKS CONNECTION Oil Plug - Kawasaki/Suzuki 24-191
WORKS CONNECTION
$32.95Stock plastic oil plugs are prone to cracking and stripping, especially under the vibration and heat cycles of aggressive riding. The WORKS CONNECTION Oil Plug replaces that liability with a...09500087- SKU:
- 09500087
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- BASE COLOR:
- BLUE
- UNITS:
- EACH
- MATERIAL:
- 6061 T-6 ALUMINUM
- RIDING STYLE:
- STREET
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- BLUE
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- OIL FILLER
$32.95 -
WORKS CONNECTION Engine Timing Plug - Blue - Honda 24-503
WORKS CONNECTION
$46.95Stock engine timing plugs are functional but aesthetically overlooked—and they're prone to corrosion that can make future service work frustrating. The WORKS CONNECTION Engine Timing Plug upgrades...09500091- SKU:
- 09500091
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- TYPE:
- ENGINE
- UNITS:
- SET
- MATERIAL:
- 6061 T-6 ALUMINUM
- COLOR/FINISH:
- ANODIZED
- COLOR/FINISH:
- BLUE
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
$46.95 -
WORKS CONNECTION Aluminum Oil Filler Plug 24-020
WORKS CONNECTION
$32.95Stock plastic oil filler plugs are prone to cracking under thermal cycling and vibration, compromising engine bay integrity and risking oil leakage. The WORKS CONNECTION Aluminum Oil Filler Plug...09500006- SKU:
- 09500006
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- BASE FINISH:
- ANODIZED
- COLOR/FINISH:
- ORANGE
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- OIL FILLER
- RIDING STYLE:
- STREET
- BASE COLOR:
- ORANGE
- UNITS:
- EACH
$32.95 -
WORKS CONNECTION Aluminum Oil Filler Plug 24-190
WORKS CONNECTION
$32.95Stock plastic oil filler plugs crack, leak, and degrade under thermal cycling—especially in high-performance applications. The WORKS CONNECTION Aluminum Oil Filler Plug replaces that weak point with...09500007- SKU:
- 09500007
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BASE COLOR:
- RED
- BASE FINISH:
- ANODIZED
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- MATERIAL:
- 6061 T-6 ALUMINUM
- TYPE:
- OIL FILLER
- COLOR/FINISH:
- RED
$32.95 -
WORKS CONNECTION Aluminum Oil Filler Plug 24-070
WORKS CONNECTION
$32.95Stock plastic oil filler plugs are prone to cracking under heat cycles and vibration, compromising your engine's seal integrity. The WORKS CONNECTION Aluminum Oil Filler Plug replaces that liability...09500009- SKU:
- 09500009
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- BASE FINISH:
- ANODIZED
- PRODUCT NAME:
- PLUG
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- TYPE:
- CRANKCASE
- BASE COLOR:
- RED
- MATERIAL:
- 6061 T-6 ALUMINUM
- UNITS:
- EACH
$32.95 -
On Sale
Wossner Piston Kit Yamaha YZ250F 2016-2018 76.95mm 8942DA
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00A worn or damaged piston directly kills engine efficiency, compression, and reliability—especially in high-revving 2-stroke applications where tolerances are razor-thin. The Wossner 8942DA restores...09105297- SKU:
- 09105297
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.00 MM
- ENGINE TYPE:
- 4-STROKE
- MODEL:
- PRO SERIES
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- BORE - OVERSIZE METRIC:
- STANDARD
- PISTON SIZE METRIC:
- 76.95 MM
- PRODUCT NAME:
- PISTON KIT
MSRP: $184.00Now: $174.80Was: $184.00 -
On Sale
Wossner Piston Kit 76.96mm Yamaha YZ250F 2016-2018 YZ250FX 2017-2019 8942DB
WOSSNER
MSRP: $184.00Now: $174.80Was: $184.00When you're pushing a 2-stroke engine to its limits, the piston is ground zero for performance and reliability. The Wossner 8942DB kit delivers the durability and precision needed to handle sustained...09105298- SKU:
- 09105298
- Availability:
- Ships Same Business Day
- Weight:
- 0.60 LBS
- BORE - OVERSIZE METRIC:
- +0.01 MM
- COMPRESSION RATIO IMPERIAL:
- 13.7:1
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE SIZE METRIC:
- 77.01 MM
- MODEL:
- PRO SERIES
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +0,01 MM
- ENGINE TYPE:
- 4-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 76.96 MM
MSRP: $184.00Now: $174.80Was: $184.00 -
On Sale
Wossner Suzuki RM250 2000-2002 Piston Kit 8059DB
WOSSNER
MSRP: $152.00Now: $144.40Was: $152.00If you're running a 2-stroke RM250 between 2000-2002, piston wear is one of the most direct threats to engine performance and reliability. The Wossner 8059DB delivers the precision engineering and...09105496- SKU:
- 09105496
- Availability:
- Ships Same Business Day
- Weight:
- 0.76 LBS
- BORE - OVERSIZE:
- +0,01 MM
- BORE SIZE METRIC:
- 66.41 MM
- DISPLACEMENT:
- 249 CC
- MODEL:
- STANDARD SERIES
- PRODUCT NAME:
- PISTON KIT
- TYPE:
- DUAL RING
- BORE - OVERSIZE METRIC:
- +0.01 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- FORGED
- PISTON SIZE METRIC:
- 66.35 MM
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
MSRP: $152.00Now: $144.40Was: $152.00
