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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Hot Cams Valve Shim 7.48mm x 3.30mm for Honda CRF 150R 2007-2018 5PK748330
HOT CAMS
$10.95Valve clearance directly impacts combustion efficiency, valve train longevity, and overall engine performance—even small deviations can cause valves to float or create excessive wear. Hot Cams valve...09261344- SKU:
- 09261344
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 3.30 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
Hot Cams Valve Shim 9.48mm x 3.05mm for Honda CRF450R 2002-2018 5PK948305
HOT CAMS
$11.50Valve shim wear directly impacts engine efficiency and responsiveness. Hot Cams Valve Shims maintain precise valve clearance, which is critical for proper combustion timing and consistent performance...09261409- SKU:
- 09261409
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- VALVE SHIM THICKNESS METRIC:
- 3.05 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- TYPE:
- VALVE
$11.50 -
Hot Cams Valve Shim Kit 9.48mm x 3.50mm for Honda CRF450R 2002-2014 HCSHIM02
HOT CAMS
$9.95Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—and improper clearance accelerates wear on cam lobes and rocker arms. This Hot Cams valve shim kit gives you...09261418- SKU:
- 09261418
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 3.50 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$9.95Qty in Cart: 0Quantity:Price:$9.95Subtotal: -
Hot Cams Valve Shim 7.48mm x 2.50mm for Honda CRF 150R 2007-2018 5PK748250
HOT CAMS
$11.50Valve shim clearance directly impacts combustion efficiency, valve timing accuracy, and overall engine longevity. The HOT CAMS 7.48 x 2.50mm shim pack gives you five precision-ground replacements to...09261328- SKU:
- 09261328
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 2.50 MM
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
$11.50Qty in Cart: 0Quantity:Price:$11.50Subtotal: -
Hot Cams Valve Shim 7.48mm x 3.25mm for Honda CRF150R 2007-2019 5PK748325
HOT CAMS
$11.50Valve clearance directly impacts combustion efficiency, fuel economy, and engine longevity—and improper shim selection compromises all three. This HOT CAMS 5-pack gives you precise adjustment options...09261343- SKU:
- 09261343
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- VALVE SHIM THICKNESS METRIC:
- 3.25 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- UNITS:
- 5 PACK
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
$11.50 -
Hot Cams Valve Shim 7.48mm x 3.35mm for Honda CBR600F 2005 5PK748335
HOT CAMS
$10.95Valve shim clearance directly impacts combustion efficiency, cam timing accuracy, and overall engine reliability—getting it right requires precision-matched components. The HOT CAMS 7.48mm x 3.35mm...09261345- SKU:
- 09261345
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- RIDING STYLE:
- STREET
- VALVE SHIM THICKNESS METRIC:
- 3.35 MM
- MATERIAL:
- STEEL
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- UNITS:
- 5 PACK
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
Hot Cams Valve Shim 7.48mm x 3.45mm for Honda CRF150R 2007-2019 5PK748345
HOT CAMS
$10.95Valve shim clearance directly impacts combustion efficiency, valve timing accuracy, and overall engine longevity—especially critical on high-revving four-strokes like the Honda CRF150R. This...09261347- SKU:
- 09261347
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- OUTSIDE DIAMETER METRIC:
- 7.48 MM
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 3.45 MM
- MATERIAL:
- STEEL
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- ATV
- TYPE:
- VALVE
$10.95Qty in Cart: 0Quantity:Price:$10.95Subtotal: -
Hot Cams Valve Shim 9.48mm x 1.35mm for Honda CRF450R 2002-2014 5PK948135
HOT CAMS
$11.50Valve clearance directly impacts horsepower, fuel efficiency, and engine longevity—and worn shims rob you of all three. The Hot Cams 9.48mm x 1.35mm Valve Shim delivers precision-engineered tolerance...09261375- SKU:
- 09261375
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- SHIM
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- VALVE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- OUTSIDE DIAMETER METRIC:
- 9.48 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
- VALVE SHIM THICKNESS METRIC:
- 1.35 MM
$11.50 -
Hinson Racing Ignition Cover Suzuki RM-Z450 2009-2025 IC430
HINSON RACING
$399.99Elevate your RMZ450's performance with the HINSON RACING Ignition Cover, designed to withstand the toughest conditions. Crafted from high-quality T-6 aircraft-grade aluminum, this ignition cover not...09401362- SKU:
- 09401362
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- MATERIAL:
- T-6 ALUMINUM
- COLOR/FINISH:
- BLACK
- MATERIAL:
- BILLET
- RIDING STYLE:
- OFF-ROAD
- TYPE:
- IGNITION
- PRODUCT NAME:
- COVER
- UNITS:
- EACH
$399.99 -
VERTEX Piston Kit 23119200
VERTEX
$177.95Whether you're rebuilding a two-stroke or four-stroke engine, piston selection directly impacts compression ratio, durability under load, and overall power delivery. VERTEX Piston Kit 23119200...09103344- SKU:
- 09103344
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CYLINDER DIAMETER METRIC:
- 56.00 MM
- PISTON MATERIAL:
- CAST
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- BORE - OVERSIZE METRIC:
- +2.00 MM
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 55.95 MM
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +2,00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- DISPLACEMENT:
- 135 CC
- STYLE:
- CAST BIG BORE
$177.95Qty in Cart: 0Quantity:Price:$177.95Subtotal: -
VERTEX Piston Kit with Gaskets VTK22795B
VERTEX
$289.95High-compression forged pistons are essential for unlocking additional power and torque across your engine's entire RPM range—especially if you're building for sustained performance or forced...09103363- SKU:
- 09103363
- Availability:
- Ships Same Business Day
- Weight:
- 1.25 LBS
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- DISPLACEMENT:
- 250 CC
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- PISTON DIAMETER METRIC:
- 66.36 MM
- PISTON MATERIAL:
- CAST
- UNITS:
- KIT
$289.95 -
VERTEX Piston Kit with Gaskets VTK22520B
VERTEX
$208.95A quality piston kit is fundamental to reliable engine performance, especially under high-load conditions where OEM components often fall short. The VERTEX VTK22520B delivers forged construction with...09103379- SKU:
- 09103379
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- PISTON DIAMETER METRIC:
- 53.94 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- CAST
- DISPLACEMENT:
- 125 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- STYLE:
- CAST REPLICA
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$208.95 -
VERTEX Piston Kit VTK23004B
VERTEX
$223.95Whether you're building a high-RPM engine or refreshing a tired block, VERTEX pistons deliver the durability and precision needed for sustained performance. The T-5 heat treatment cycle ensures these...09103073- SKU:
- 09103073
- Availability:
- Ships Same Business Day
- Weight:
- 0.85 LBS
- ENGINE TYPE:
- 2-STROKE
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- PISTON DIAMETER METRIC:
- 53.96 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- DISPLACEMENT:
- 125 CC
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- TOP END PISTON KIT
$223.95 -
VERTEX Piston Kit VTK23630B
VERTEX
$243.95Piston durability directly impacts engine longevity and performance reliability—especially under high-boost or high-RPM conditions where thermal stress accelerates wear. The VERTEX Piston Kit...09103099- SKU:
- 09103099
- Availability:
- Ships Same Business Day
- Weight:
- 1.24 LBS
- DISPLACEMENT:
- 250 CC
- PRODUCT NAME:
- TOP END PISTON KIT
- RIDING STYLE:
- STREET
- CYLINDER DIAMETER METRIC:
- 66.40 MM
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 66.35 MM
- RIDING STYLE:
- OFF-ROAD
- STYLE:
- CAST REPLICA
$243.95Qty in Cart: 0Quantity:Price:$243.95Subtotal: -
VERTEX Piston Circlips - 4-Stroke 72075K
VERTEX
$4.15Piston circlips are critical retention components that keep your piston rings seated and functioning under extreme combustion pressures—failure here means catastrophic engine damage. When rebuilding...09130057- SKU:
- 09130057
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- CIRCLIP
- RIDING STYLE:
- UTV
- APPLICATION:
- PISTON
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
- RIDING STYLE:
- ATV
$4.15 -
VERTEX Piston Ring 53010004750
VERTEX
$25.95Piston rings are wear items that directly impact compression, blow-by control, and engine longevity—replacing them during maintenance or rebuild is essential to restoring your engine's performance...09120166- SKU:
- 09120166
- Availability:
- Ships Same Business Day
- Weight:
- 0.01 LBS
- PRODUCT NAME:
- PISTON RING
- UNITS:
- EACH
- RIDING STYLE:
- OFF-ROAD
- PISTON DIAMETER METRIC:
- 47.45 MM
$25.95Qty in Cart: 0Quantity:Price:$25.95Subtotal: -
VERTEX Piston Ring 53010004850
VERTEX
$26.95Piston rings are the critical seal between your combustion chamber and crankcase—when they wear, you lose compression, power, and efficiency. The VERTEX Piston Ring 53010004850 delivers the...09120168- SKU:
- 09120168
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 48.45 MM
$26.95Qty in Cart: 0Quantity:Price:$26.95Subtotal: -
VERTEX Piston Ring 53010005400
VERTEX
$32.50Factory piston rings wear down through normal engine operation, causing blow-by, loss of compression, and reduced power output. VERTEX Piston Ring 53010005400 restores your engine's sealing integrity...09120170- SKU:
- 09120170
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- PISTON RING
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- PISTON DIAMETER METRIC:
- 53.96 MM
$32.50 -
VERTEX Piston Kit 23628A
VERTEX
$177.95OEM pistons wear out—especially in high-demand racing and forced-induction applications. The VERTEX Piston Kit 23628A delivers precision-engineered pistons with advanced surface treatments that...09102113- SKU:
- 09102113
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- STYLE:
- CAST BIG BORE
- UNITS:
- KIT
- ENGINE TYPE:
- 2-STROKE
- PISTON DIAMETER METRIC:
- 52.44 MM
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- BORE - OVERSIZE:
- +5,00 MM
- BORE - OVERSIZE METRIC:
- +5.00 MM
- CYLINDER DIAMETER METRIC:
- 52.50 MM
- DISPLACEMENT:
- 104 CC
- RIDING STYLE:
- OFF-ROAD
- PISTON MATERIAL:
- ALUMINUM ALLOY
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
$177.95 -
VERTEX Piston Kit 22996B
VERTEX
$171.95The VERTEX Piston Kit 22996B delivers the durability and precision your engine demands, whether you're chasing lap times or rebuilding a worn top end. Engineered with forged 2618 aluminum and a T-5...09102127- SKU:
- 09102127
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COMPRESSION RATIO IMPERIAL:
- STANDARD
- RIDING STYLE:
- OFF-ROAD
- ENGINE TYPE:
- 2-STROKE
- PISTON MATERIAL:
- ALUMINUM ALLOY
- PISTON MATERIAL:
- CAST
- PRODUCT NAME:
- PISTON KIT
- SKIRT COATING:
- MOLYBDENUM DISULPHITE
- UNITS:
- KIT
- CYLINDER DIAMETER METRIC:
- 54.00 MM
- DISPLACEMENT:
- 125 CC
- PISTON DIAMETER METRIC:
- 53.93 MM
- STYLE:
- CAST RACE
$171.95
