BSA


BSA made their mark in the English observed trials world with the Gold Star, and continued to have success with the unit-construction C15 and B40. These bikes, along with the two-stroke Bantam, are still favorites with riders and spectators alike.

For general parts, please see the product index on the left.

Parts available for BSA Trials
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BTH Electronic Magneto, Singles

UK-made BTH PM1R base-mount magneto suitable for Ariel, BSA and Matchless pre-unit singles (and others using an anti-clockwise mag). Upgrade to modern, reliable, electronic sparks! Comes standard with a 35mm spindle height; add a base plate for applications that require a 45mm spindle height.

BTH Electronic Magneto, Singles - $735.00

UK-made BTH PM1R base-mount magneto suitable for Ariel, BSA and Matchless pre-unit singles (and others using an anti-clockwise mag). Upgrade to modern, reliable, electronic sparks! Comes standard with a 35mm spindle height; add a base plate for applications that require a 45mm spindle height.

Motorcycle Model G85, Gold Star
Motorcycle Manufacturer Ariel, BSA, Matchless
   
BTH Electronic Magneto, Singles
Price $735.00
Description

UK-made BTH PM1R base-mount magneto suitable for Ariel, BSA and Matchless pre-unit singles (and others using an anti-clockwise mag). Upgrade to modern, reliable, electronic sparks! Comes standard with a 35mm spindle height; add a base plate for applications that require a 45mm spindle height.

Motorcycle Model G85, Gold Star
Motorcycle Manufacturer Ariel, BSA, Matchless
BSA Unit Single Kickstart Shaft
Newly-made kickstart shafts for BSA unit singles, your choice of of 5/8", 3/4"B44 and 3/4"B50. These do not fit distributor engines.
BSA Unit Single Kickstart Shaft - $165.00
Newly-made kickstart shafts for BSA unit singles, your choice of of 5/8", 3/4"B44 and 3/4"B50. These do not fit distributor engines.
Motorcycle Model B50
Motorcycle Manufacturer BSA
   
BSA Unit Single Kickstart Shaft
Price $165.00
Description Newly-made kickstart shafts for BSA unit singles, your choice of of 5/8", 3/4"B44 and 3/4"B50. These do not fit distributor engines.
Motorcycle Model B50
Motorcycle Manufacturer BSA
BSA B44 Splined Kickstart Shaft/Cranked Kick Lever

The solution to all B44 kickstart mechanism problems! Cranked-out kick lever folds nicely against the sidecase, and multiple positions are afforded, all with an massively-positive interface between lever and 3/4-inch-diameter shaft. Needle bearing included. We can swap the kickstart top to the 3-inch swing-out, if preferred.

BSA B44 Splined Kickstart Shaft/Cranked Kick Lever - $295.00

The solution to all B44 kickstart mechanism problems! Cranked-out kick lever folds nicely against the sidecase, and multiple positions are afforded, all with an massively-positive interface between lever and 3/4-inch-diameter shaft. Needle bearing included. We can swap the kickstart top to the 3-inch swing-out, if preferred.

Motorcycle Model B44
Motorcycle Manufacturer BSA
   
BSA B44 Splined Kickstart Shaft/Cranked Kick Lever
Price $295.00
Description

The solution to all B44 kickstart mechanism problems! Cranked-out kick lever folds nicely against the sidecase, and multiple positions are afforded, all with an massively-positive interface between lever and 3/4-inch-diameter shaft. Needle bearing included. We can swap the kickstart top to the 3-inch swing-out, if preferred.

Motorcycle Model B44
Motorcycle Manufacturer BSA
Exhaust Pipe, BSA C15/B40

This 1-3/8" chromed exhaust pipe is suitable for trials or motocross use.

Exhaust Pipe, BSA C15/B40 - $105.00

This 1-3/8" chromed exhaust pipe is suitable for trials or motocross use.

Motorcycle Model B40, C15
Motorcycle Manufacturer BSA
   
Exhaust Pipe, BSA C15/B40
Price $105.00
Description

This 1-3/8" chromed exhaust pipe is suitable for trials or motocross use.

Motorcycle Model B40, C15
Motorcycle Manufacturer BSA
Gas Tank, Alloy, BSA B44 Racing

Cool, narrower version of the classic B44 "breadloaf" tank. Includes flip-up Monza cap. Center-mount fixing makes this a great choice for many applications. The tunnel is over three-inches wide, so B50 frame fitment is possible.

Gas Tank, Alloy, BSA B44 Racing - $550.00

Cool, narrower version of the classic B44 "breadloaf" tank. Includes flip-up Monza cap. Center-mount fixing makes this a great choice for many applications. The tunnel is over three-inches wide, so B50 frame fitment is possible.

Motorcycle Model B40, B44, C15
Motorcycle Manufacturer BSA
   
Gas Tank, Alloy, BSA B44 Racing
Price $550.00
Description

Cool, narrower version of the classic B44 "breadloaf" tank. Includes flip-up Monza cap. Center-mount fixing makes this a great choice for many applications. The tunnel is over three-inches wide, so B50 frame fitment is possible.

Motorcycle Model B40, B44, C15
Motorcycle Manufacturer BSA
Valve, British Singles
Genuine Hepolite valves for single-cylinder British motorcycles. In-stock items appear in the drop-down menu, others available on short notice.
Valve, British Singles - $25.00
Genuine Hepolite valves for single-cylinder British motorcycles. In-stock items appear in the drop-down menu, others available on short notice.
Motorcycle Model B40, B44, B50, C15, Tiger Cub
Motorcycle Manufacturer BSA, Triumph
   
Valve, British Singles
Price $25.00
Description Genuine Hepolite valves for single-cylinder British motorcycles. In-stock items appear in the drop-down menu, others available on short notice.
Motorcycle Model B40, B44, B50, C15, Tiger Cub
Motorcycle Manufacturer BSA, Triumph
Big-End Assemblies, Alpha

Alpha is the world's foremost manufacturer of crankpin bearing assemblies for British bikes. Assembly includes the crankpin, bearing, rod liner and nuts (if applicable); for machines with one-piece connecting rods and pressed-together cranks.

Big-End Assemblies, Alpha - $250.00

Alpha is the world's foremost manufacturer of crankpin bearing assemblies for British bikes. Assembly includes the crankpin, bearing, rod liner and nuts (if applicable); for machines with one-piece connecting rods and pressed-together cranks.

Motorcycle Model B40, B44, B50, C15, G85, Gold Star, HT5, Tiger Cub
Motorcycle Manufacturer Ariel, BSA, Matchless, Triumph
   
Big-End Assemblies, Alpha
Price $250.00
Description

Alpha is the world's foremost manufacturer of crankpin bearing assemblies for British bikes. Assembly includes the crankpin, bearing, rod liner and nuts (if applicable); for machines with one-piece connecting rods and pressed-together cranks.

Motorcycle Model B40, B44, B50, C15, G85, Gold Star, HT5, Tiger Cub
Motorcycle Manufacturer Ariel, BSA, Matchless, Triumph
Case Screw Set, Stainless Allens

Stainless socket-head cap-screw set for British machines. Includes wrenches.

Case Screw Set, Stainless Allens - $30.00

Stainless socket-head cap-screw set for British machines. Includes wrenches.

Motorcycle Model B25, B40, B44, B50, C15, T120, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
   
Case Screw Set, Stainless Allens
Price $30.00
Description

Stainless socket-head cap-screw set for British machines. Includes wrenches.

Motorcycle Model B25, B40, B44, B50, C15, T120, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
Clutch Pressure Plate, Alloy
Billet aluminum-alloy clutch pressure plates are stiffer than stock, providing superior clutch action. In-stock items listed below, others available upon request.
Clutch Pressure Plate, Alloy - $55.00
Billet aluminum-alloy clutch pressure plates are stiffer than stock, providing superior clutch action. In-stock items listed below, others available upon request.
Motorcycle Model B25, B40, B44, B50, C15, T100, T120, T140, TR6
Motorcycle Manufacturer BSA, Matchless, Triumph
   
Clutch Pressure Plate, Alloy
Price $55.00
Description Billet aluminum-alloy clutch pressure plates are stiffer than stock, providing superior clutch action. In-stock items listed below, others available upon request.
Motorcycle Model B25, B40, B44, B50, C15, T100, T120, T140, TR6
Motorcycle Manufacturer BSA, Matchless, Triumph
Valve Guides, British

Bronze valve guides sold individually. Available for Triumph 650/750, or Triumph 500. The Cub and BSA unit singles use Triumph 500 guides. The standard outside diameter for all is .501"; oversizes available.

Valve Guides, British - $15.00

Bronze valve guides sold individually. Available for Triumph 650/750, or Triumph 500. The Cub and BSA unit singles use Triumph 500 guides. The standard outside diameter for all is .501"; oversizes available.

Motorcycle Model B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
   
Valve Guides, British
Price $15.00
Description

Bronze valve guides sold individually. Available for Triumph 650/750, or Triumph 500. The Cub and BSA unit singles use Triumph 500 guides. The standard outside diameter for all is .501"; oversizes available.

Motorcycle Model B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph