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
-
KIBBLEWHITE Valve Seat 10-SB350
KIBBLEWHITE
$34.71If you're running titanium valves in a high-performance application, valve seat material matters—a lot. KIBBLEWHITE's copper-based seats deliver superior thermal conductivity and wear resistance, keeping your engine reliable across extended racing duty...09261626- SKU:
- 09261626
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MATERIAL:
- TITANIUM
- INSIDE DIAMETER METRIC:
- 26.00 MM
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- EXHAUST
- OUTSIDE DIAMETER METRIC:
- 35.00 MM
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
- VALVE SEAT HEIGHT METRIC:
- 11.00 MM
$34.71 -
KIBBLEWHITE Valve Seat 10-SB385
KIBBLEWHITE
$40.81If you're running titanium valves in a high-performance engine, your valve seats need to match that precision. The KIBBLEWHITE 10-SB385 is purpose-built to handle the thermal demands and wear patterns titanium creates, ensuring reliable seating and...09261627- SKU:
- 09261627
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- INSIDE DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- TITANIUM
- VALVE SEAT HEIGHT METRIC:
- 11.00 MM
- OUTSIDE DIAMETER METRIC:
- 38.50 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
$40.81 -
KIBBLEWHITE Valve Seat 10-SB390
KIBBLEWHITE
$40.81If you're running titanium valves in a high-performance engine, your valve seats are the critical interface between extreme heat and precision engineering. KIBBLEWHITE's copper-based seat design delivers the thermal conductivity and wear resistance...09261628- SKU:
- 09261628
- Availability:
- Ships Same Business Day
- Weight:
- 0.09 LBS
- INSIDE DIAMETER METRIC:
- 30.00 MM
- MATERIAL:
- TITANIUM
- OUTSIDE DIAMETER METRIC:
- 39.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- VALVE SEAT HEIGHT METRIC:
- 11.00 MM
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- VALVE SEAT
$40.81 -
KIBBLEWHITE Cast Iron Valve Seat 10-SC290
KIBBLEWHITE
$8.24If you're running high-RPM applications or alternative fuels—whether it's nitrous, forced induction, or methanol—your valve seats need to withstand extreme thermal stress and microwelding without recession. The KIBBLEWHITE Cast Iron Valve Seat 10-SC290...09261631- SKU:
- 09261631
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER METRIC:
- 21.00 MM
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
- APPLICATION:
- INTAKE
- HEAD DIAMETER METRIC:
- 29.00 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 29.00 MM
- PRODUCT NAME:
- VALVE SEAT
$8.24 -
KIBBLEWHITE Cast Iron Valve Seat 10-SC310
KIBBLEWHITE
$8.49Valve seat recession is one of the most insidious problems in high-performance engines—it silently erodes compression, destroys your power curve, and forces expensive rebuilds. The KIBBLEWHITE Cast Iron Valve Seat 10-SC310 eliminates this failure mode...09261632- SKU:
- 09261632
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- INSIDE DIAMETER METRIC:
- 23.00 MM
- VALVE SEAT HEIGHT METRIC:
- 9.50 MM
- HEAD DIAMETER METRIC:
- 31.00 MM
- MATERIAL:
- STEEL
- OUTSIDE DIAMETER METRIC:
- 31.00 MM
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- APPLICATION:
- EXHAUST
- PRODUCT NAME:
- VALVE SEAT
- RIDING STYLE:
- ATV
$8.49 -
KIBBLEWHITE Cast Iron Valve Seat 10-SC390
KIBBLEWHITE
$9.57Valve seat recession and microwelding are silent killers in high-performance engines—they compromise combustion efficiency, increase blow-by, and shorten engine life. The KIBBLEWHITE Cast Iron Valve Seat 10-SC390 uses advanced powdered metal technology...09261638- SKU:
- 09261638
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- PRODUCT NAME:
- VALVE SEAT
- UNITS:
- EACH
- MATERIAL:
- STEEL
- RIDING STYLE:
- OFF-ROAD
- APPLICATION:
- INTAKE
- INSIDE DIAMETER METRIC:
- 30.00 MM
- OUTSIDE DIAMETER METRIC:
- 39.00 MM
- HEAD DIAMETER METRIC:
- 39.00 MM
- VALVE SEAT HEIGHT METRIC:
- 10.00 MM
$9.57 -
KIBBLEWHITE Spring Kit - .440" 30-31250
KIBBLEWHITE
$207.83Valve spring performance directly impacts your engine's ability to maintain precise valve timing under high RPM conditions. The KIBBLEWHITE Spring Kit delivers consistent lift and closure across the entire rev range, preventing valve float that...09261640- SKU:
- 09261640
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- APPLICATION:
- INTAKE
- PRODUCT NAME:
- SPRING KIT
- SPRING LIFT IMPERIAL:
- 0.440'
- SPRING OPEN PRESSURE:
- INTAKE 147 LB, EXHAUST 203 LB
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- KIT
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
$207.83 -
KIBBLEWHITE Exhaust Valve 30-31266
KIBBLEWHITE
$31.01Exhaust valves are critical to engine reliability and performance—they endure extreme heat cycling and high-velocity gas flow that demands superior material integrity. KIBBLEWHITE's Black Diamond™ valves are engineered to withstand these demanding...09261643- SKU:
- 09261643
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- EXHAUST
- HEAD DIAMETER METRIC:
- 30.00 MM
- LENGTH IMPERIAL:
- 3.175'
- TULIP ANGLE:
- 20°
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1955'
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- MODEL:
- BLACK DIAMOND™
$31.01 -
KIBBLEWHITE Exhaust Valve 40-40416
KIBBLEWHITE
$31.01Exhaust valves endure extreme thermal cycling and chemical exposure—factory components often succumb to carbon buildup, corrosion, and premature wear. The Kibblewhite Black Diamond™ Exhaust Valve (40-40416) is engineered to outlast OEM parts by combining...09261651- SKU:
- 09261651
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- RIDING STYLE:
- UTV
- MATERIAL:
- STAINLESS STEEL
- MODEL:
- BLACK DIAMOND™
- PRODUCT NAME:
- VALVE
- STEM DIAMETER IMPERIAL:
- 0.1955'
- HEAD DIAMETER METRIC:
- 26.00 MM
- LENGTH IMPERIAL:
- 3.655'
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
- TULIP ANGLE:
- 10°
- UNITS:
- EACH
$31.01 -
KIBBLEWHITE Valve Guide 40-40420
KIBBLEWHITE
$19.83Valve guide wear is one of the most overlooked causes of oil consumption and compression loss in high-performance engines. The KIBBLEWHITE Valve Guide 40-40420 uses premium Ampco-45 composition to deliver the thermal conductivity and wear resistance your...09261653- SKU:
- 09261653
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- INSIDE DIAMETER IMPERIAL:
- 0.1955'
- RIDING STYLE:
- UTV
- APPLICATION:
- INTAKE
- OUTSIDE DIAMETER IMPERIAL:
- 0.4160'
- PRODUCT NAME:
- VALVE GUIDE
- MATERIAL:
- C630 BRONZE
- APPLICATION:
- EXHAUST
- RIDING STYLE:
- ATV
- SIZE IMPERIAL:
- STANDARD
- UNITS:
- EACH
$19.83 -
KIBBLEWHITE Exhaust Valve 60-60210H
KIBBLEWHITE
$37.55Exhaust valves experience extreme thermal and mechanical stress, and OEM units often succumb to wear, carbon buildup, and corrosion—compromising engine efficiency and reliability. The KIBBLEWHITE Black Diamond™ 60-60210H delivers precision-engineered...09261656- SKU:
- 09261656
- Availability:
- Ships Same Business Day
- Weight:
- 0.11 LBS
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- TULIP ANGLE:
- 20°
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- LENGTH IMPERIAL:
- 3.120'
- UNITS:
- EACH
- HEAD DIAMETER METRIC:
- 31.00 MM
- MODEL:
- BLACK DIAMOND™
- STEM DIAMETER IMPERIAL:
- 0.1765'
$37.55 -
KIBBLEWHITE Exhaust Valve 60-60213H
KIBBLEWHITE
$37.55If you're building a high-revving engine that demands reliability under extreme conditions, valve quality directly impacts combustion efficiency, longevity, and peak horsepower. KIBBLEWHITE's Black Diamond™ exhaust valves are engineered to withstand...09261658- SKU:
- 09261658
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- HEAD DIAMETER METRIC:
- 25.00 MM
- STEM DIAMETER IMPERIAL:
- 0.1756'
- APPLICATION:
- EXHAUST
- MATERIAL:
- STAINLESS STEEL
- PRODUCT NAME:
- VALVE
- TULIP ANGLE:
- 25°
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- EACH
- LENGTH IMPERIAL:
- 3.115'
- MODEL:
- BLACK DIAMOND™
$37.55 -
KIBBLEWHITE Spring Kit - .445" 60-60500
KIBBLEWHITE
$220.26Valve spring integrity directly impacts engine reliability and performance across the entire RPM band. This KIBBLEWHITE Spring Kit delivers precisely engineered spring rates and damping characteristics, ensuring consistent valve control whether you're...09261660- SKU:
- 09261660
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- SPRING LIFT IMPERIAL:
- 0.445'
- APPLICATION:
- EXHAUST
- TYPE:
- VALVE
- MATERIAL:
- TITANIUM
- PRODUCT NAME:
- SPRING KIT
- APPLICATION:
- INTAKE
- RIDING STYLE:
- OFF-ROAD
- SPRING OPEN PRESSURE:
- 160 LB
- UNITS:
- KIT
$220.26 -
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
