Year: 1955
Engine No: D1 models, DD-101 (Direct & comp) / DDB-101 (Battery). D3 models, BD3-5138 (Direct & comp) / BD3B-5138 (Battery)
Frame No: BD2-34701 (Rigid) / BD2S-34701 (Plunger)
CC: 125cc & 150cc
Colours: Same as for 1954, there was a maroon option available for the D1 model.
Changes:
There was a circlip introduced with the left-hand crankcase seal, the cylinder head & barrel stud centres were increased to 55mm.
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Year: 1956Engine No: D1 models, DD-4801 (Direct) / DDB-3301 (Battery). D3 models, BD3-10401 (Direct) / BD3B-12801 (Battery)
Frame No: D1 models, BD2S-55001 / D3 models, CD3-101
CC: 125cc & 150cc
Colours: Same as for 1955
Changes:
The fuel tank filler cap was moved from the left-hand to the right-hand side. The DD & DDB model engines used shims fitted to the left-hand side of the main bearing. The D1 Competition & Rigid frames were discontinued, the D3 had the swing-arm frame.
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Year: 1957
Engine No: D1 models, DD-4801 (Direct) / DDB-3301 (Battery) / D3 models, BD3-10401 (Direct) / BD3B-12801 (Battery)
Frame No: D1 models, BD2S-55001 / D3 models, CD3-101
CC: 125cc & 150cc
Colours: D1 models as per 1956. D3 models had the black & maroon options available.
Changes:
This year saw the left-hand main bearing oil seal being positioned against the flywheel, with an additional left-hand oil seal added. There needed to be some drilling holes to enable the gearbox oil to lubricate the main left-hand bearing.
Year: 1958
Engine No: D1 models, DD-8577 (Direct) / DDB-7849 (Battery) / D5 models, ED5-101 (Direct) / ED5B-101 (Battery)
Frame No: D1 models, BD2S-65001 / D5 models, FD5-101
CC: 125cc & 175cc
Colours: D1 as per 1957. Black or maroon options with the 'Bantam Super' tank transfer.
Changes:
The D5 replaced the D3 Major model, the crankcase studs were moved out to 60mm, (this was the D5 only). Big-end bearings with Duralamin cages were new, also radial drillings in the con-rod for all the models.
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Year: 1959
Engine No: D1 models, DD-10812 (Direct) / DDB-10628 (Battery) / D7 models, ED7-101 / (Direct) / ED7B-101 (Battery)
Frame No: D1 models, BD2S-67581 / D7 models, D7-101
CC: 125cc &175cc
Colours: D1 as per 1958 / D7 models: 'Super black with ivory petrol tank panels & 'Bantam Super' tank transfers.
Changes:
The Bantam D5 model was replaced by the D7 model. The D7 model's engine had a left-hand outer cover with a 'Super' inscription on it, also the cycle & frame parts were completely revised.
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Year: 1960
Engine No: D1 models, DD-12501 (Direct) / DDB-12501 (Battery) / D7 models, ED7-1501 (Direct) / ED7B-7001 (Battery)
Frame No: D1 models, BD2S-70501 / D7 models, D7-8101
CC: 125cc & 175cc
Colours: D1 models, The forks, headlamp, toolbox & frame were painted black, the tank & mudguards were in the mist green colour with the tank panels being ivory with red & gold lining. The options also included black or fuchsia red.
D7 models, they had black frame, forks & headlamp nacelle. The tank, mudguards & the central compartment were available in sapphire blue, fuchsia red or black with ivory tank panels.
Changes:
D1 models had the headlamp, frame & forks finished in black. D7 models were to have lugs added to the frame & lower steering yolk for the use on a padlock.
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Year: 1961
Engine No: D1 models, DD-14501 (Direct) / DDB-14501 (Battery) / D7 models, ED7-3001 (Direct) / ED7B-15501 (Battery)
Frame No: D1 models, BD2S-73701 / D7 models, D7-18401
CC: 125cc & 175cc
Colours: As per 1960, the fuchsia red was changed to royal red.
Changes:
The bronze bushes on the little end were replaced for better wearing needle roller bearings. The tank also saw a change, red plastic (acrylic) pear shaped badges were added.