Metric Air Intake & Fuel System

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      76 products
      A pair of Mikuni XS650 carburetors.
      Two Mikuni XS650 Mikuni VM Roundslide 34mm Performance Carb Kit Tuned By TC Bros. for Yamaha XS650 motorcycles.
      Mikuni
      XS650 Mikuni VM Roundslide 34mm Performance Carb Kit Tuned By TC Bros.
      $434.95
      27 reviews
      TC Bros. offers TC Bros. e-gift cards for motorcycle enthusiasts.
      TC Bros.
      TC BROS. GIFT CARD
      from $10.00
      A set of Universal Frisco Gas Tank Mounting Kit by TC Bros bolts and washers for a motorcycle, including Stainless steel button head bolts.
      A close up of a motorcycle engine with Universal Frisco Gas Tank Mounting Kit by TC Bros mild steel tophat bungs.
      TC Bros.
      Universal Frisco Gas Tank Mounting Kit by TC Bros
      $28.95
      41 reviews
      A durable TC Bros. Reserve Fuel Bottle with the word texas on it.
      A durable TC Bros. Reserve Fuel Bottle on a white background.
      TC Bros.
      TC Bros. Reserve Fuel Bottle
      $19.95
      17 reviews
      A set of Moto Iron® Sportster Gas Tank Rubber Mounting Kits on a white background for custom applications.
      A set of Moto Iron® Sportster Gas Tank Rubber Mounting Kits on a white background for custom applications.
      Moto Iron®
      Sportster Gas Tank Rubber Mounting Kit
      $28.95
      24 reviews
      A set of TC Bros. XS650 Billet Aluminum Intake Manifolds with aftermarket 34-36mm Mikuni VM Roundslide carburetors on a white background.
      A set of TC Bros. XS650 Billet Aluminum Intake Manifolds with aftermarket 34-36mm Mikuni VM Roundslide carburetors on a white background.
      TC Bros.
      TC Bros. XS650 Billet Aluminum Intake Manifolds
      $79.95
      15 reviews
      The Kreem Gas Tank Sealer Kit is a kit designed to prevent internal rust and seal fuel tanks.
      Kreem
      Kreem Gas Tank Sealer Kit
      $54.95
      10 reviews
      A Prism Supply Petcock - 90° 1/4" NPT - Stainless on a white background from Prism Supply.
      A Prism Supply Petcock - 90° 1/4
      Prism Supply
      Prism Supply Petcock - 90° 1/4" NPT - Stainless
      $129.99
      A pair of stainless steel TC Bros NPT bungs on a white background.
      Two 1/4 NPT Steel Weld In Petcock Bungs by TC Bros on a white background.
      TC Bros.
      1/4 NPT Steel Weld In Petcock Bungs by TC Bros
      $19.95
      1 review
      A Moto Iron® Cam Lock Gas Cap on a white background.
      A close up of a motorcycle with a red and black paint job featuring the Moto Iron® Cam Lock Gas Cap, a chrome plated steel vented gas cap.
      Moto Iron®
      Cam Lock Gas Cap
      $14.95
      21 reviews
      A Moto Iron® 1/4" Fuel Valve Petcock 90 Degree with a red handle on a white background.
      A close up of a Moto Iron® 1/4
      Moto Iron®
      1/4" Fuel Valve Petcock 90 Degree
      $19.95
      25 reviews
      A Prism Supply Petcock - 90° 1/4" NPT - Brass fitting on a white background.
      A Prism Supply Petcock - 90° 1/4
      Prism Supply
      Prism Supply Petcock - 90° 1/4" NPT - Brass
      $109.99
      A set of TC Bros. brass fittings and hoses, perfect for the TC Bros. DIY Gas Tank Fuel Sight Gauge Kit.
      A set of TC Bros. brass fittings and Tygon hoses is available for DIY enthusiasts.
      TC Bros.
      TC Bros. DIY Gas Tank Fuel Sight Gauge Kit
      $38.95
      5 reviews
      A group of Leather Cushion Washers with 3/8 inch Hole 10 pack, provided by TC Bros., providing paint protection and cushioning on a white background.
      A set of TC Bros. Leather Cushion Washers with 3/8 inch Hole 10 pack, ideal for cushioning and paint protection, on a white background.
      TC Bros.
      Leather Cushion Washers with 3/8 inch Hole 10 pack
      $6.95
      28 reviews
      Two TC Bros 3/8 NPT Steel Weld In Petcock Bungs on a white background.
      Two TC Bros. 3/8 NPT Steel Weld In Petcock Bungs on a white background.
      TC Bros.
      3/8 NPT Steel Weld In Petcock Bungs by TC Bros
      $19.95
      6 reviews
      A pair of UNI Filter Clamp-on High Flow Air Filter Kits (2.125"-2.25"), enhancing air flow, on a white surface.
      A motorcycle parked in front of a garage, showcasing its power and performance with the UNI Filter Clamp-on High Flow Air Filter Kit (pair)(2.125
      UNI Filter
      UNI Clamp-on High Flow Air Filter Kit (pair)(2.125"-2.25")
      $48.95
      9 reviews
      A Moto Iron® 1/4" NPT Male Fuel Valve Petcock with a red handle on it, featuring a stainless steel fuel filter screen.
      A stainless steel Moto Iron® 1/4
      Moto Iron®
      1/4" NPT Male Fuel Valve Petcock
      $34.95
      11 reviews
      Keyster Yamaha XS650 Special Carb Rebuild Kit 1980-1981 - Yamaha R1 Yamaha R2 Yamaha R3.
      A special Yamaha XS650 Special Carb Rebuild Kit 1980-1981 for a Yamaha XS650 motorcycle model from 1980-1981, manufactured by Keyster.
      Keyster
      Yamaha XS650 Special Carb Rebuild Kit 1980-1981
      $39.95
      2 reviews
      A Prism Supply Petcock - 1/4" NPT Stainless on a white background, giving off a fuel tank appearance.
      A Prism Supply Petcock - 1/4
      Prism Supply
      Prism Supply Petcock - 1/4" NPT Stainless
      $119.99
      A white and gold Moto Iron® valve with a 3/8 NPT Male Fuel Valve Petcock 90 Degree on a white background.
      Moto Iron®
      3/8 NPT Male Fuel Valve Petcock 90 Degree
      $27.95
      11 reviews
      A Wyatt Gatling 1/4" 90 Degree Petcock With Screen Filter with a red handle on a white background.
      Wyatt Gatling
      1/4" 90 Degree Petcock With Screen Filter
      $29.04
      A Prism Supply Petcock - 3/8" NPT - Stainless threaded plug on a white background, suitable for 3/8" NPT.
      A Prism Supply Petcock - 3/8
      Prism Supply
      Prism Supply Petcock - 3/8" NPT - Stainless
      $119.99
      A Moto Iron® flexible fuel tubing made of plasticized PVC, suitable for gasoline or alcohol type fuel, on a white background.
      Moto Iron®
      1/4" Translucent "Smoke" Black Fuel Line 3ft
      $8.95
      5 reviews
      A Moto Iron® chrome-plated steel screw in gas cap on a white background.
      A motorcycle with a Moto Iron® chrome plated steel vented screw in gas cap parked in a garage.
      Moto Iron®
      Screw in Gas Cap
      $14.95
      4 reviews
      A small hole in a piece of black plastic has been modified for the Moto Iron® 1/4" NPT Angled Petcock Bung.
      A Moto Iron® 1/4
      Moto Iron®
      1/4" NPT Angled Petcock Bung
      $14.95
      A set of Heavy Duty Gas Tank Rubber Mounting Kit brackets and screws by TC Bros for welding.
      A pair of Heavy Duty Gas Tank Rubber Mounting Kit bolts by TC Bros on a white background.
      TC Bros.
      Heavy Duty Gas Tank Rubber Mounting Kit by TC Bros
      $42.95
      3 reviews
      A 1/4" NPT Male Brass Fuel Petcock by Prism Supply Co fitting with a threaded end, perfect for connecting to a gas tank.
      A motorcycle with a Prism Supply gas tank attached to it.
      Prism Supply
      1/4" NPT Male Brass Fuel Petcock by Prism Supply Co
      $94.95
      A Moto Iron® black screw-in gas cap with a light on it.
      An image of a Moto Iron® Black Screw In Gas Cap hose connector.
      Moto Iron®
      Black Screw In Gas Cap
      $14.95
      24 reviews
      The Moto Iron® In-Line Glass Fuel Filter fits 1/4", 5/16", or 3/8" ID hoses, featuring a clear housing with metal ends and black plastic connectors. This washable, reusable filter ensures optimal performance for diverse applications.
      The Moto Iron® In-Line Glass Fuel Filter fits 1/4
      Moto Iron®
      In-Line Glass Fuel Filter For 1/4",5/16"OR 3/8"ID Hose
      $14.95
      6 reviews
      A Moto Iron® Black Cam Lock Gas Cap on a white background.
      A Moto Iron® Black Cam Lock Gas Cap with a metal knob on it.
      Moto Iron®
      Black Cam Lock Gas Cap
      $14.95
      15 reviews
      A TC Bros Aluminum Vented Filler Cap with Bung for Oil or Gas Tanks for a gas tank and a chopper.
      TC Bros. Aluminum Vented Filler Cap with Bung for custom oil tank and gas tank.
      TC Bros.
      TC Bros Aluminum Vented Filler Cap with Bung for Oil or Gas Tanks
      $39.95
      4 reviews
      A Moto Iron® Straight Spigot 3/8" NPT Male Fuel Valve Petcock with a wooden handle and a show chrome finish on a white background.
      A Moto Iron® Straight Spigot 3/8
      Moto Iron®
      Straight Spigot 3/8" NPT Male Fuel Valve Petcock
      $27.95
      2 reviews
      A Prism Supply polished brass hose connector with a threaded 3/8" NPT Male Brass Fuel Petcock end.
      A motorcycle with a 3/8
      Prism Supply
      3/8" NPT Male Brass Fuel Petcock by Prism Supply Co
      $94.95
      1 review
      A Mid-USA Chrome High Performance Fuel Filter (1/4" Line) valve on a white background.
      A Mid-USA Chrome High Performance Fuel Filter (1/4
      Mid-USA
      Chrome High Performance Fuel Filter (1/4" Line)
      $16.46
      3 reviews
      A 1/4" In-Line Fuel Shut Off Valve with a red handle for fuel delivery on a white background, manufactured by Motion Pro.
      A Motion Pro 1/4
      Motion Pro
      1/4" In-Line Fuel Shut Off Valve
      $19.99
      3 reviews
      A TC Bros. Gas Tank Sight Glass Kit (with steel weld in bung) and a black nut on a white background in an oil tank.
      TC Bros.
      TC Bros. Gas Tank Sight Glass Kit (with steel weld in bung)
      $29.95
      2 reviews
      A Moto Iron® 1/4" Brass Petcock with T Handle NPT Male x NPT Female with a vintage look on a white background.
      A Moto Iron® 1/4
      Moto Iron®
      1/4" Brass Petcock with T Handle NPT Male x NPT Female
      $24.95
      4 reviews
      A Drag Specialties In-line Glass Mini Fuel Filter - 5/16 on a white background.
      Drag Specialties
      In-line Glass Mini Fuel Filter - 5/16
      $14.95
      A pair of Moto Iron® DIY Motorcycle Gas Tank Builder Mounting Tab Sets on a white background, perfect for the motorcycle gas tank builder.
      A pair of grey Moto Iron® DIY Motorcycle Gas Tank Builder Mounting Tab Sets, perfect for a DIY motorcycle gas tank builder, on a white background.
      Moto Iron®
      DIY Motorcycle Gas Tank Builder Mounting Tab Set
      $11.95
      2 reviews
      An Accel stainless steel valve with a red handle and high flow capacity.
      An Accel valve with a red handle on a white background.
      Accel
      Accel High Flow Straight Spigot Petcock Fits 3/8" NPT and 22mm Tank Bungs
      $89.99
      A 1/4" Translucent Red Fuel Line 3ft from Moto Iron® on a white background.
      Moto Iron®
      1/4" Translucent Red Fuel Line 3ft
      $8.95
      5 reviews
      A Helix red plasticized PVC hose, soft flexible fuel tubing that is 5/16" ID.
      Helix
      5/16" Red Fuel Line 3ft
      $12.72
      A black 1/4" Petcock Fuel Valve - Straight - Black by Drag Specialties on a white background.
      Drag Specialties
      1/4" Petcock Fuel Valve - Straight - Black
      $27.95
      A TC Bros. stainless steel threaded nut and a TC Bros. custom oil tank with the TC Bros Aluminum Unvented Filler Cap with Bung for Oil or Gas Tanks.
      TC Bros Aluminum Unvented Filler Cap with Bung for Oil or Gas Tanks - TC Bros.
      TC Bros.
      TC Bros Aluminum Unvented Filler Cap with Bung for Oil or Gas Tanks
      $34.95
      2 reviews
      A 1/4" Hose Barb 90 Degree Elbow 1/4" NPT Brass (sold each) with a threaded end, Moto Iron®.
      A Moto Iron® 1/4
      Moto Iron®
      1/4" Hose Barb 90 Degree Elbow 1/4" NPT Brass (sold each)
      $7.95
      6 reviews
      A Helix 5/16" Clear Fuel Line 3ft on a white background.
      Helix
      5/16" Clear Fuel Line 3ft
      $12.72
      A set of Mid-USA Fuel and Oil Line Stainless Hose Clamps For 7/16" TO 11/16" OD Hose (10 Pack) HD #10014, perfect for emergency repairs on fuel and oil lines, on a white background.
      Mid-USA
      Fuel and Oil Line Stainless Hose Clamps For 7/16" TO 11/16" OD Hose (10 Pack) HD #10014
      $16.44
      1 review
      A 1/4" Clear Fuel Line 3ft made of plasticized PVC, suitable for gasoline or alcohol, on a white background.
      Moto Iron®
      1/4" Clear Fuel Line 3ft
      $8.95
      3 reviews
      An Emgo 3/8" Rubber Fuel/Oil Line 5ft suitable for oil and fuel applications.
      Emgo
      3/8" Rubber Fuel/Oil Line 5ft
      $18.95
      An Emgo 1/4" Rubber Fuel/Oil Line 5ft on a white background.
      Emgo
      1/4" Rubber Fuel/Oil Line 5ft
      $14.95
      A Moto Iron® screw in style DIY filler neck bung, made of metal with holes, perfect for DIY projects and custom gas tanks, placed on a white background.
      Moto Iron®
      Screw in style DIY filler neck bung
      $8.95
      1 review
      A Moto Iron® ring on a background.
      Moto Iron®
      Cam lock style DIY filler neck bung
      $8.95
      A 5/16" blue Helix Fuel Line 3ft made of plasticized PVC on a white background.
      Helix
      5/16" Blue Fuel Line 3ft
      $13.95
      A Keyster carburetor rebuild kit for the Yamaha XS650 1978-1979 small engine with BS38 carburetor.
      A Keyster carburetor rebuild kit for the Yamaha XS650 1978-1979 motorcycle.
      Keyster
      Yamaha XS650 Carb Rebuild Kit 1978-1979
      $39.95
      A 1/4" Translucent Blue Fuel Line 3ft by Moto Iron® on a white background.
      Moto Iron®
      1/4" Translucent Blue Fuel Line 3ft
      $8.95
      2 reviews
      Moto Iron® 1/4" Hose Barb Tee Brass (sold each)
      A Moto Iron® 1/4
      Moto Iron®
      1/4" Hose Barb Tee Brass (sold each)
      $7.95
      An Emgo 5/16" Rubber Fuel/Oil Line 5ft for fuel applications on a white background.
      Emgo
      5/16" Rubber Fuel/Oil Line 5ft
      $16.95
      An image of a chrome knob on a white background, featuring the upgraded LC Fabrications Mikuni Aluminum Top VM30-VM34 carbs with a polished aluminum finish.
      Close up of an upgraded LC Fabrications Mikuni Aluminum Top VM30-VM34 motorcycle engine with a polished aluminum finish and Mikuni VM series carbs.
      LC Fabrications
      LC Fabrications Mikuni Aluminum Top VM30-VM34
      $49.95
      A Moto Iron® 3/8" Brass Petcock with T Handle, perfect for custom bikes, on a white background.
      A Moto Iron® 3/8
      Moto Iron®
      3/8" Brass Petcock with T Handle
      $24.95
      1 review
      A Helix 5/16" Black Fuel Line 3ft on a white background with interior build up.
      Helix
      5/16" Black Fuel Line 3ft
      $12.72

      Air Intake & Fuel System Upgrades for Metric Motorcycles. The Metric Air Intake & Fuel System collection at TC Bros is designed for riders and builders looking to maximize performance and style on their metric motorcycles. This category features high-quality carburetor kits, air filters, fuel tanks, and related components, all engineered for durability and peak efficiency. Perfect for popular metric models like Yamaha XS650, Honda CB750, and other custom chopper or bobber builds, these parts deliver the reliability and bold aesthetic riders demand. With TC Bros’ trusted craftsmanship and a focus on functionality, this collection gives you the tools to enhance your bike’s power and character.