Triumph Carburetors & Fuel System Parts

Shop vintage Triumph carburetors and fuel-system parts for Bonneville, Tiger, Trophy, Daytona and Trident motorcycles. Explore Amal carburetors and components, Wassell replacement parts, rebuild kits, jets, inlet manifolds, throttle cables, fuel lines and petcocks. The right Triumph carburetor depends on more than engine size. Match your motorcycle’s model and year with the carburetor series, bore, specification, mounting arrangement and single-, twin- or triple-carb layout. Check the identification stamped on your existing carburetor, and use the buying guide below to understand the details before ordering.

Choosing the Right Carburetor for Your Vintage Triumph

A vintage Triumph carburetor is not a universal replacement part. Two carburetors can share the same bore size while using different jetting, needles, spray tubes, controls or mounting arrangements. The correct choice starts with identifying both the motorcycle and the carburetor—not simply ordering by engine capacity.

Begin with these details:

1. Motorcycle model and model year.
2. Engine capacity and any known engine modifications.
3. Existing carburetor make, series and complete stamped identification.
4. Single-, twin- or triple-carburetor arrangement.
5. Bore size and left- or right-hand configuration.
6. Inlet manifold, mounting hardware and air-filter connections.
7. Throttle cables, choke controls and fuel-line routing.

Original specifications provide a starting point, but changes to the engine, exhaust or air filtration can require different settings. A previous owner may also have fitted a carburetor that was not originally specified for the motorcycle.

Browse our wider vintage Triumph parts collection when your fuel-system work also requires related restoration parts.

What Makes Triumph Carburetor Selection Different?

Similar model names do not guarantee the same carburetor

Your Triumph’s full model designation matters. Do not assume that every T100 uses the same arrangement, that a Tiger listing automatically applies to a Bonneville, or that every T140 uses the same carburetor family.

For example, our category includes Amal 626 carburetor sets for specified T100T and T100R Daytona applications alongside later T140 MKII fuel-line assemblies. These are different applications, not interchangeable fuel-system packages. Always read the individual product description and verify your motorcycle’s actual configuration.

Bore size is only part of an Amal’s identity

On an Amal MK1 Concentric, the three-digit body identification describes the series and bore:

Identification	Series	Bore
626	600 Series	26 mm
928	900 Series	28 mm
930	900 Series	30 mm
932	900 Series	32 mm

The additional specification number identifies the original application and settings. Left- and right-hand versions also differ in the position of their ticklers and adjusting screws. Match the complete identification rather than stopping at “626” or “930.”

A Trident is not simply a twin with another carburetor

Triumph triple applications require particular attention to internal specifications. Amal identifies a distinctive spray-tube arrangement for Triumph triples and a separate needle specification for the T160. Do not assume that a same-size carburetor or needle intended for a twin is correct for a Trident.

Mounting technique can affect throttle safety

An Amal MK1 Concentric can suffer flange or body distortion if its mounting nuts are overtightened. That distortion can make the throttle slide stick. Clean, flat mounting surfaces, correct seals and careful tightening are therefore part of a safe installation—not finishing details.

Compare Triumph Carburetor Types

Amal Monobloc carburetors

For a restoration requiring a Monobloc, match the exact series, bore, specification and installation layout. Our range includes the Amal 376 Monobloc in 1-1/16-inch bore and Amal 389 Monobloc in 1-1/8-inch bore.

Check the individual listing rather than choosing solely by appearance or the “Monobloc” name.

Amal MK1 Concentric carburetors

Amal introduced the MK1 Concentric during the 1967 model year. Its compact float-chamber arrangement places the fuel around the main jet to reduce the effects of fuel surge during cornering and changing throttle conditions.

For an existing installation, identify the body, bore and specification before selecting replacement carburetors or service parts. Our range includes standard Amal 626 carburetor sets and Premier Alloy 626 sets for specified Triumph 500 applications.

Amal Premier replacements

When considering a Premier replacement, check the exact product specification, supplied settings and compatible service parts. “Premier” does not make every bore size or jet selection suitable for every Triumph.

For example, the Amal Premier Alloy 930 right-hand carburetor is a specific 30 mm product with a stated supplied main jet—not a universal recommendation for all 650 or 750 Triumphs.

Wassell Evolution carburetors

Our range includes 28 mm Wassell Evolution left- and right-hand sets and 30 mm Wassell Evolution sets.

Check the application, included jetting and required mounting components before ordering. Use the correct Wassell Evolution pilot jets where specified; do not assume a similarly named part automatically substitutes for an Amal component.

Amal MKII systems on later T140 motorcycles

Later T140 applications require particular care when identifying cables, fuel lines, cold-start parts and mounting components. Our category includes MKII-specific parts as well as MK1 components, so the model name alone is not enough to select the correct item.

Compare the appropriate MKII fuel-line assembly and MKII carburetor mounting washer set against the parts actually fitted to your motorcycle.

Rebuild Your Existing Carburetor or Replace It?

A rebuild makes sense when the carburetor body and slide remain serviceable and the problems involve replaceable wear items, seals or contamination. Start with inspection—not a larger jet.

For suitable applications, shop:

• Amal Concentric overhaul kits.
• Amal 389 Monobloc major overhaul kits.
• Concentric float-bowl gaskets.
• Genuine Amal needle jets.
• Genuine Amal throttle needles.
• Hard-anodized Amal throttle slides.

A gasket kit cannot correct a worn mixing-chamber body or restore safe operation to a distorted carburetor. Amal advises replacement when flange distortion causes the slide to jam, or body wear allows enough air leakage to prevent accurate tuning. Consult Amal’s MK1 Concentric rebuilding guide before deciding which parts to buy.

Match the Jet to the Throttle Range

Carburetor circuits overlap, but identifying where the problem occurs helps you select the right adjustment or replacement part.

Approximate throttle opening	Main area to investigate	Related parts
Closed to 1/8	Pilot circuit and pilot-air adjustment	Genuine Amal pilot jets, where applicable
1/8 to 1/4	Throttle-slide cutaway	Amal throttle slides
1/4 to 3/4	Needle jet, needle and clip position	Needle jets and throttle needles
3/4 to fully open	Main-jet selection	Genuine Amal main jets

These are diagnostic ranges, not rigid boundaries. Before changing jetting, check fuel level, air leaks, ignition timing, valve clearances and engine condition. Read our Triumph carburetor tuning basics for the broader tuning process.

Important Triumph Carburetor Installation Tips

1. Identify the mounting arrangement before tightening anything

Use the installation instructions for the actual carburetor and manifold combination. Do not apply a generic torque figure across Monobloc, MK1, MKII and modified installations.

For Amal MK1 Concentrics, Amal specifies careful, even tightening and warns against pulling the carburetor tightly against the intake flange. Its rebuilding guide states a maximum mounting-nut torque of 4 lb-ft; this is not a universal specification for every Triumph carburetor mounting system.

2. Check the manifold and heat-insulating spacer

The mounting flange and insulating spacer must be clean and flat. Uneven surfaces can distort the carburetor when the nuts are tightened.

Check the application before replacing phenolic carburetor insulators, mounting cupped washers and O-rings or Bonneville inlet manifolds. These parts are application-dependent, not one universal mounting stack.

3. Install MK1 Concentrics as assembled units

Amal recommends fitting the carburetor with the float chamber, mixing-chamber top, slide and cable components assembled. This helps maintain rigidity and reduces the risk of distortion during installation.

4. Check throttle return after fitting the tank

Before starting the engine, confirm that the throttle opens smoothly and closes sharply. Repeat the check with the tank fitted and the handlebars turned fully in both directions.

If the slide binds or cable tension changes with steering movement, correct the problem before running the motorcycle. Use the specified cable, such as the T140V throttle-cable assembly for its listed application, rather than selecting by approximate length alone.

5. Confirm fuel supply and float operation

A restricted fuel supply, contaminated float valve or incorrect fuel level can resemble a jetting problem. Inspect the tank, taps, filters, lines and float components before adjusting the mixture.

Use a fuel-line assembly appropriate to the installation, such as the listed T120/T140 fuel-line assembly or the separate MKII arrangement. Work on a cool motorcycle in a ventilated area away from ignition sources, and check for leaks before starting.

6. Tune with the intended air filters and exhaust fitted

Changes to air filtration or exhaust can alter the required carburetor settings. Complete the installation in the configuration you intend to ride.

Check the correct replacement air-filter elements, 376/600 Series filter adapters or 900 Series threaded adapter rings for your setup.

7. Synchronize multiple carburetors

On a multi-carburetor Triumph, each carburetor needs the correct settings and the carburetors must work together. Synchronization checks help ensure that throttle operation and cylinder contribution remain balanced.

Do not use synchronization adjustments to compensate for an air leak, sticking slide, blocked pilot circuit or ignition fault.

For manufacturer guidance, consult Amal’s installation instructions and Amal’s technical library.

Need Help Identifying Your Triumph Carburetor?

Before ordering, gather your motorcycle’s model, year, engine capacity and the complete identification stamped on the carburetor. Include clear photographs of the carburetor, manifold and air-filter connection when using our contact page.

That information provides a more useful starting point than engine size alone. Review our shipping and returns information before purchasing parts for an uncertain or modified application.

Triumph Carburetor FAQs