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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KIBBLEWHITE Valve Guide 60-60520
KIBBLEWHITE
$17.83Valve guide wear is one of the most common failure points in high-performance engines, leading to oil consumption, blow-by, and reduced ring sealing. The KIBBLEWHITE Valve Guide 60-60520 is engineered with Ampco-45 bronze to handle the extreme thermal...09261665- SKU:
- 09261665
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.1765'
- OUTSIDE DIAMETER IMPERIAL:
- 0.3778'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
$17.83 -
KIBBLEWHITE Intake Valve Guide 80-80770
KIBBLEWHITE
$22.29Valve guide wear directly compromises compression, increases oil consumption, and degrades cylinder sealing—all of which kill power and reliability. The KIBBLEWHITE 80-80770 Intake Valve Guide uses Ampco-45, a copper-nickel alloy engineered for superior...09261687- SKU:
- 09261687
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- C630 BRONZE
- PRODUCT NAME:
- VALVE GUIDE
- SIZE IMPERIAL:
- STANDARD
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- INSIDE DIAMETER IMPERIAL:
- 0.2165'
- RIDING STYLE:
- OFF-ROAD
$22.29 -
KIBBLEWHITE Exhaust Valve Guide 80-80780
KIBBLEWHITE
$22.29Valve guide wear directly compromises combustion chamber seal and engine performance—this KIBBLEWHITE exhaust valve guide maintains precise bore tolerances and thermal stability under sustained high-RPM operation. Built from Ampco-45, a copper-nickel...09261688- SKU:
- 09261688
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- NICKEL
- SIZE IMPERIAL:
- STANDARD
- MATERIAL:
- AMPCO-45
- OUTSIDE DIAMETER IMPERIAL:
- 0.4352'
- PRODUCT NAME:
- VALVE GUIDE
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2160'
- MATERIAL:
- BRONZE
- RIDING STYLE:
- OFF-ROAD
$22.29 -
KIBBLEWHITE Intake Valve 82-82155
KIBBLEWHITE
$37.55Factory intake valves wear down under sustained heat and combustion pressure, robbing your engine of efficiency and reliability. The KIBBLEWHITE Black Diamond™ Intake Valve delivers measurable gains in flow consistency, corrosion resistance, and...09261689- SKU:
- 09261689
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MODEL:
- BLACK DIAMOND™
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 37.72 MM
- LENGTH IMPERIAL:
- 3.775'
- STEM DIAMETER IMPERIAL:
- 0.2160'
- TULIP ANGLE:
- 17°
$37.55 -
KIBBLEWHITE Exhaust Valve 82-82158
KIBBLEWHITE
$37.55Exhaust valve performance directly impacts engine efficiency, throttle response, and longevity under high RPM conditions. The KIBBLEWHITE Black Diamond™ valve delivers measurable improvements in flow characteristics and durability, making it essential...09261691- SKU:
- 09261691
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 32.44 MM
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- UTV
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.815'
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2155'
- TULIP ANGLE:
- 25°
$37.55 -
KIBBLEWHITE Spring Kit 96-96000
KIBBLEWHITE
$181.00A precision valve spring kit is fundamental to reliable high-RPM performance and consistent valve timing across the entire powerband. KIBBLEWHITE's engineered spring solution eliminates the risk of valve float and spring fatigue that can derail race day...09261696- SKU:
- 09261696
- Availability:
- Ships Same Business Day
- Weight:
- 0.68 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 214 LB
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- SPRING LIFT IMPERIAL:
- 0.435'
- TYPE:
- VALVE
$181.00 -
KIBBLEWHITE Intake Valve 96-96004
KIBBLEWHITE
$37.55Intake valve performance directly impacts combustion efficiency, cylinder sealing, and overall engine reliability under sustained high RPM operation. The Kibblewhite Black Diamond™ valve delivers measurable gains in flow consistency and durability...09261697- SKU:
- 09261697
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 35.00 MM
- LENGTH IMPERIAL:
- 3.815'
- TULIP ANGLE:
- 20°
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
$37.55 -
KIBBLEWHITE Intake Valve 96-96005
KIBBLEWHITE
$37.55Intake valve performance directly impacts your engine's breathing efficiency and power delivery—a worn or inferior valve compromises combustion quality and throttle response. KIBBLEWHITE's Black Diamond™ intake valves are engineered from premium EV8...09261698- SKU:
- 09261698
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- HEAD DIAMETER METRIC:
- 36.00 MM
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.815'
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- STEM DIAMETER IMPERIAL:
- 0.2350'
- TULIP ANGLE:
- 20°
$37.55 -
KIBBLEWHITE Exhaust Valve 96-96007
KIBBLEWHITE
$37.55Valve degradation under extreme combustion temperatures is one of the fastest ways to lose power and reliability in a high-performance engine. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers the durability and precision needed to withstand repeated...09261699- SKU:
- 09261699
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.2342'
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- LENGTH IMPERIAL:
- 3.815'
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 24°
- HEAD DIAMETER METRIC:
- 30.00 MM
- RIDING STYLE:
- OFF-ROAD
$37.55 -
KIBBLEWHITE Exhaust Valve 96-96008
KIBBLEWHITE
$37.55Exhaust valves are among the most thermally stressed and wear-prone components in your engine—they need to withstand extreme temperatures, corrosive combustion byproducts, and thousands of cycles per minute. The KIBBLEWHITE Black Diamond™ exhaust valve...09261700- SKU:
- 09261700
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- LENGTH IMPERIAL:
- 3.815'
- STEM DIAMETER IMPERIAL:
- 0.2342'
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- HEAD DIAMETER METRIC:
- 21.00 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 24°
- UNITS:
- EACH
$37.55 -
KIBBLEWHITE Intake Valve Guide 96-96010
KIBBLEWHITE
$22.29Valve guide wear is one of the most common causes of oil consumption and performance degradation in high-mileage engines. The KIBBLEWHITE Intake Valve Guide 96-96010 replaces worn guides with a precision-engineered component that restores proper valve...09261701- SKU:
- 09261701
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- INSIDE DIAMETER IMPERIAL:
- 0.2360'
- SIZE IMPERIAL:
- STANDARD
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4745'
$22.29 -
KIBBLEWHITE Exhaust Valve Guide 96-96020
KIBBLEWHITE
$22.29Valve guide wear is a silent killer of engine performance, causing increased oil consumption, blow-by, and eventual catastrophic valve failure. The KIBBLEWHITE Exhaust Valve Guide 96-96020 is precision-engineered from Ampco-45, a copper-nickel compound...09261702- SKU:
- 09261702
- Availability:
- Ships Same Business Day
- Weight:
- 0.07 LBS
- RIDING STYLE:
- OFF-ROAD
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4745'
- APPLICATION:
- EXHAUST
- INSIDE DIAMETER IMPERIAL:
- 0.2360'
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
$22.29 -
KIBBLEWHITE Exhaust Valve 96-96266
KIBBLEWHITE
$54.10Your engine's exhaust valves endure extreme temperatures and constant stress—factory components often fall short under high-performance demands. The KIBBLEWHITE Black Diamond™ Exhaust Valve delivers the durability and reliability you need for sustained...09261713- SKU:
- 09261713
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1955'
- TULIP ANGLE:
- 30°
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 26.60 MM
- LENGTH IMPERIAL:
- 3.665'
- PRODUCT NAME:
- VALVE
- RIDING STYLE:
- OFF-ROAD
$54.10 -
KIBBLEWHITE Intake Valve Guide 96-96270
KIBBLEWHITE
$24.89Valve guide wear is one of the most common failure points in high-revving and forced-induction engines, leading to oil consumption, compression loss, and costly engine rebuilds. The KIBBLEWHITE Intake Valve Guide 96-96270 replaces worn guides with...09261715- SKU:
- 09261715
- Availability:
- Ships Same Business Day
- Weight:
- 0.04 LBS
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.3958'
- PRODUCT NAME:
- VALVE GUIDE
- INSIDE DIAMETER IMPERIAL:
- 0.1960'
- MATERIAL:
- C630 BRONZE
- RIDING STYLE:
- OFF-ROAD
$24.89 -
KIBBLEWHITE Intake Valve Guide 30-30730
KIBBLEWHITE
$15.92Your engine's intake valves endure extreme temperatures and constant stress, making quality valve guides essential to maintaining proper sealing and preventing wear that can compromise compression and performance. KIBBLEWHITE's Ampco-45 construction...09300019- SKU:
- 09300019
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- MATERIAL:
- AMPCO-45
- INSIDE DIAMETER IMPERIAL:
- 0.2155'
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$15.92 -
KIBBLEWHITE Exhaust Valve Guide 30-30740
KIBBLEWHITE
$15.92Valve guides are critical components that direct oil flow and maintain precise valve alignment under extreme combustion pressures. The KIBBLEWHITE 30-30740 exhaust valve guide uses Ampco-45, a specialized copper-nickel alloy engineered specifically for...09300021- SKU:
- 09300021
- Availability:
- Ships Same Business Day
- Weight:
- 0.03 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.2150'
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER IMPERIAL:
- 0.4360'
- MATERIAL:
- AMPCO-45
- PRODUCT NAME:
- VALVE GUIDE
- RIDING STYLE:
- ATV
- UNITS:
- EACH
$15.92 -
K&S TECHNOLOGIES Water Pump Repair Gasket Kit - YZF450 75-4003
K&S TECHNOLOGIES
$34.95A failing water pump gasket kit can quickly escalate into catastrophic engine damage—coolant leaks compromise thermal management and leave you stranded trackside or roadside. The K&S Technologies Water Pump Repair Gasket Kit delivers OEM-quality sealing...09341923- SKU:
- 09341923
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
- PRODUCT NAME:
- GASKET KIT
- RIDING STYLE:
- ATV
- TYPE:
- WATER PUMP REPAIR
- UNITS:
- KIT
$34.95Qty in Cart: 0Quantity:Price:$34.95Subtotal: -
On Sale
HOTOP Breather Gear Air Ramp PBGR-20
HOTOP
MSRP: $44.95Now: $29.00Was: $44.95Excessive crankcase pressure kills engine longevity and saps horsepower—especially in high-revving or forced-induction applications. The HOTOP Breather Gear Air Ramp PBGR-20 dramatically improves crankcase evacuation by increasing CFM flow by...DS194254- SKU:
- DS194254
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- PRODUCT NAME:
- AIR RAMP
- TYPE:
- BREATHER GEAR
- UNITS:
- EACH
- RIDING STYLE:
- STREET
MSRP: $44.95Now: $29.00Was: $44.95Qty in Cart: 0Quantity:Price:MSRP: $44.95Now: $29.00Was: $44.95Subtotal: -
On Sale
JAMES GASKET Alternator Cap Cover O-ring ST-11900029
JAMES GASKET
MSRP: $6.95Now: $4.00Was: $6.95Alternator cap cover o-rings are critical sealing components that prevent moisture, dirt, and debris from compromising your alternator's internal windings and electrical connections. A deteriorated or missing o-ring can lead to corrosion, voltage...09351073- SKU:
- 09351073
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- ALTERNATOR CAP
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
MSRP: $6.95Now: $4.00Was: $6.95 -
On Sale
JAMES GASKET Clutch Actuator Shaft O-ring ST-11900030
JAMES GASKET
MSRP: $3.95Now: $3.00Was: $3.95A worn or degraded clutch actuator shaft o-ring compromises hydraulic pressure and leads to inconsistent clutch engagement—a critical issue for reliable operation. This genuine JAMES GASKET replacement restores proper sealing, ensuring crisp clutch feel...09351074- SKU:
- 09351074
- Availability:
- Ships Same Business Day
- Weight:
- 0.10 LBS
- APPLICATION:
- CLUTCH
- PRODUCT NAME:
- O-RING
- RIDING STYLE:
- STREET
- UNITS:
- 5 PACK
MSRP: $3.95Now: $3.00Was: $3.95
