| MODEL | BSA 9.86 HP DE LUXE V-TWIN 986 1928 |
| Year | 1928 |
| Engine Type | Four-stroke V-twin side-valve |
| Displacement / Capacity | 986 cc |
| Bore X Stroke | 80 mm x 98 mm |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | — |
| Max Torque | — |
| Ignition | Chain-driven magneto |
| Induction | Amac carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Mechanical pump, gravity feed with sight feed on tank, hand pump for emergencies |
| Gear Box | BSA three-speed, constant mesh, enclosed kick-starter |
| Clutch | Floating dry-plate, left-hand lever |
| Final Drive | Chain: 5/8 x 3/8 in front and rear |
| CHASSIS SPECS | |
| Frame | Sidecar-type frame with integral lugs, steering damper |
| Front Suspension | Wide BSA spring fork with barrel spring and shock absorbers |
| Rear Suspension | — |
| Front Brakes | Internal expanding, 7 in, right-hand lever |
| Rear Brakes | Internal expanding, 7 in, heel pedal |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 26 x 3.25 in cord (27 x 4 in balloon optional), 19 x 3 in quick-detachable rims |
| Rear Tyre | 26 x 3.25 in cord (27 x 4 in balloon optional), 19 x 3 in quick-detachable rims |
| FUEL SYSTEM | |
| Fuel Capacity | 2.5 Imperial gal (oil 3 pints) |
| Fuel Consumption | — |
| Top Speed | — |
The big De Luxe V-twin was built for heavy sidecar outfits, with redesigned pistons, rods and big ends for strength and lower vibration. It gave extra performance at speed and on bad roads while staying cheap to run.
