BSA B50


Still popular in vintage motocross, the mighty B50 grew out of the little C15 and is the last of the BSAs.

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

Parts available for B50
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Ignition Kit, Boyer Bransden MkIV

The Boyer Bransden MKIV is a contactless ignition-triggering system featuring an electronic advance and retard. Designed to fit all British unit-construction singles and twins, this system is powered by your Lucas-style stator. Twins require two 6v coils wired in series, while the Singles take a 12v coil. The Boyer also retains the original capacitor, rectifier and zener diode, all three of which can be replaced by a single unit, the solid-state Sparx box. The MkIV is the best Boyer choice for off-road, battery-less use. Special order, takes two days.

Ignition Kit, Boyer Bransden MkIV - $150.00

The Boyer Bransden MKIV is a contactless ignition-triggering system featuring an electronic advance and retard. Designed to fit all British unit-construction singles and twins, this system is powered by your Lucas-style stator. Twins require two 6v coils wired in series, while the Singles take a 12v coil. The Boyer also retains the original capacitor, rectifier and zener diode, all three of which can be replaced by a single unit, the solid-state Sparx box. The MkIV is the best Boyer choice for off-road, battery-less use. Special order, takes two days.

Motorcycle Model A50, A65, B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Rickman, Triumph
   
Ignition Kit, Boyer Bransden MkIV
Price $150.00
Description

The Boyer Bransden MKIV is a contactless ignition-triggering system featuring an electronic advance and retard. Designed to fit all British unit-construction singles and twins, this system is powered by your Lucas-style stator. Twins require two 6v coils wired in series, while the Singles take a 12v coil. The Boyer also retains the original capacitor, rectifier and zener diode, all three of which can be replaced by a single unit, the solid-state Sparx box. The MkIV is the best Boyer choice for off-road, battery-less use. Special order, takes two days.

Motorcycle Model A50, A65, B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Rickman, Triumph
Ignition Kit, Boyer Bransden Micro Digital

The Micro Digital Ignition features a built-in computer which can make more than a million ignition decisions per second, to constantly monitor engine speed and time the spark precisely to suit. Special-order only, takes just two days.

Ignition Kit, Boyer Bransden Micro Digital - $190.00

The Micro Digital Ignition features a built-in computer which can make more than a million ignition decisions per second, to constantly monitor engine speed and time the spark precisely to suit. Special-order only, takes just two days.

Motorcycle Model A50, A65, B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
   
Ignition Kit, Boyer Bransden Micro Digital
Price $190.00
Description

The Micro Digital Ignition features a built-in computer which can make more than a million ignition decisions per second, to constantly monitor engine speed and time the spark precisely to suit. Special-order only, takes just two days.

Motorcycle Model A50, A65, B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
Clutch Hub Puller, British
Extractor tool for British clutch centers.
Clutch Hub Puller, British - $18.00
Extractor tool for British clutch centers.
Motorcycle Model A50, A65, B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
   
Clutch Hub Puller, British
Price $18.00
Description Extractor tool for British clutch centers.
Motorcycle Model A50, A65, B25, B40, B44, B50, C15, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Triumph
Sprocket, Front, BSA

Unit BSA sprockets are available for #428 or #520 chain; the Gold Star/A10 is for #520 chain only. We only stock a couple of sizes, but others are available on special order.

Sprocket, Front, BSA - $28.00

Unit BSA sprockets are available for #428 or #520 chain; the Gold Star/A10 is for #520 chain only. We only stock a couple of sizes, but others are available on special order.

Motorcycle Model A10, B25, B40, B44, B50, C15, Gold Star
Motorcycle Manufacturer BSA
   
Sprocket, Front, BSA
Price $28.00
Description

Unit BSA sprockets are available for #428 or #520 chain; the Gold Star/A10 is for #520 chain only. We only stock a couple of sizes, but others are available on special order.

Motorcycle Model A10, B25, B40, B44, B50, C15, Gold Star
Motorcycle Manufacturer BSA
BSA Kickstart Shaft

Newly-made BSA kickstart shafts; your choice of of 5/8" or 3/4"  for unit singles (these do not fit distributor engines) or swingarm-framed pre-unit singles/twins.

BSA Kickstart Shaft - $150.00

Newly-made BSA kickstart shafts; your choice of of 5/8" or 3/4"  for unit singles (these do not fit distributor engines) or swingarm-framed pre-unit singles/twins.

Motorcycle Model A10, B25, B40, B44, B50, C15, Gold Star
Motorcycle Manufacturer BSA
   
BSA Kickstart Shaft
Price $150.00
Description

Newly-made BSA kickstart shafts; your choice of of 5/8" or 3/4"  for unit singles (these do not fit distributor engines) or swingarm-framed pre-unit singles/twins.

Motorcycle Model A10, B25, B40, B44, B50, C15, Gold Star
Motorcycle Manufacturer BSA
BSA Kickstart Pinion
New kickstart pinions for BSAs. Your choice of C15-B44 (top left), B50 (top right) or pre-unit singles and twins.
BSA Kickstart Pinion - $32.00
New kickstart pinions for BSAs. Your choice of C15-B44 (top left), B50 (top right) or pre-unit singles and twins.
Motorcycle Model A10, B25, B40, B44, B50, C15, Gold Star
Motorcycle Manufacturer BSA
   
BSA Kickstart Pinion
Price $32.00
Description New kickstart pinions for BSAs. Your choice of C15-B44 (top left), B50 (top right) or pre-unit singles and twins.
Motorcycle Model A10, B25, B40, B44, B50, C15, Gold Star
Motorcycle Manufacturer BSA
Gas Cap, Monza Flip-Up

Alloy Monza flip-up cap assembly, your choice of size: 2" or 2-1/2".

Gas Cap, Monza Flip-Up - $55.00

Alloy Monza flip-up cap assembly, your choice of size: 2" or 2-1/2".

Motorcycle Model A10, Any, B25, B44, B50, C15, Challenger, G85, Gold Star, Griffon, Hawkstone/MCS, HT5, Metisse, MkIII, MkIV, Q.U.B., Scottish
Motorcycle Manufacturer AJS, Any, Ariel, BSA, Cotton, Greeves, Matchless, Rickman
   
Gas Cap, Monza Flip-Up
Price $55.00
Description

Alloy Monza flip-up cap assembly, your choice of size: 2" or 2-1/2".

Motorcycle Model A10, Any, B25, B44, B50, C15, Challenger, G85, Gold Star, Griffon, Hawkstone/MCS, HT5, Metisse, MkIII, MkIV, Q.U.B., Scottish
Motorcycle Manufacturer AJS, Any, Ariel, BSA, Cotton, Greeves, Matchless, Rickman
Alloy Fenders
Alloy Fenders - $102.00

Polished aluminum alloy fenders have a rolled bead at one end. They are undrilled, and normally require trimming for length and component clearance. Very nice fenders with a huge range of applications. Four sizes available (see drop-down menu). Sold individually.

Alloy Fenders - $102.00

Polished aluminum alloy fenders have a rolled bead at one end. They are undrilled, and normally require trimming for length and component clearance. Very nice fenders with a huge range of applications. Four sizes available (see drop-down menu). Sold individually.

Motorcycle Model A10, A65, Alpina, Anglian, Any, B25, B40, B44, B50, C15, Challenger, Cota, G85, Gold Star, Griffon, Hawkstone/MCS, HT5, M.A.R., Matador, Scottish, Sherpa T, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer AJS, Any, Ariel, BSA, Bultaco, Cotton, Greeves, Husqvarna, Maico, Matchless, Montesa, Ossa, Penton, Triumph
   
Alloy Fenders
Price $102.00
Description

Polished aluminum alloy fenders have a rolled bead at one end. They are undrilled, and normally require trimming for length and component clearance. Very nice fenders with a huge range of applications. Four sizes available (see drop-down menu). Sold individually.

Motorcycle Model A10, A65, Alpina, Anglian, Any, B25, B40, B44, B50, C15, Challenger, Cota, G85, Gold Star, Griffon, Hawkstone/MCS, HT5, M.A.R., Matador, Scottish, Sherpa T, T100, T120, T140, Tiger Cub, TR6
Motorcycle Manufacturer AJS, Any, Ariel, BSA, Bultaco, Cotton, Greeves, Husqvarna, Maico, Matchless, Montesa, Ossa, Penton, Triumph
Clutch Plates, Fiber, Emgo

Top-quality Asian fiber clutch plates for BSA unit singles, BSA twins or Triumph twins. Please specify which make/model. Sold individually.

Clutch Plates, Fiber, Emgo - $9.00

Top-quality Asian fiber clutch plates for BSA unit singles, BSA twins or Triumph twins. Please specify which make/model. Sold individually.

Motorcycle Model A10, A50, A65, B25, B40, B44, B50, C15, Gold Star, T100, T120, TR6
Motorcycle Manufacturer BSA, Triumph
   
Clutch Plates, Fiber, Emgo
Price $9.00
Description

Top-quality Asian fiber clutch plates for BSA unit singles, BSA twins or Triumph twins. Please specify which make/model. Sold individually.

Motorcycle Model A10, A50, A65, B25, B40, B44, B50, C15, Gold Star, T100, T120, TR6
Motorcycle Manufacturer BSA, Triumph
Clutch Plates, Steel, Barnett

Made in the USA from only the best materials. Available for BSA, Husqvarna and Triumph. Sold individually. The entire line of Barnett products is available; please call with your needs.

Clutch Plates, Steel, Barnett - $7.50

Made in the USA from only the best materials. Available for BSA, Husqvarna and Triumph. Sold individually. The entire line of Barnett products is available; please call with your needs.

Motorcycle Model A10, A50, A65, B25, B40, B44, B50, C15, Gold Star, T100, T120, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Husqvarna, Triumph
   
Clutch Plates, Steel, Barnett
Price $7.50
Description

Made in the USA from only the best materials. Available for BSA, Husqvarna and Triumph. Sold individually. The entire line of Barnett products is available; please call with your needs.

Motorcycle Model A10, A50, A65, B25, B40, B44, B50, C15, Gold Star, T100, T120, Tiger Cub, TR6
Motorcycle Manufacturer BSA, Husqvarna, Triumph
 
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