Engine number |
Model |
Notes |
Year 1968 |
| 126125 |
|
9 March 1968 Consigned to Doran & Wright |
| 126125 |
20M3 750 |
1st Commando. Engine prefix 20M3; external rev-counter drive; points in old magneto position; front wheel 3.00x 19in; rear wheel 3.50x 19in; short roadholders with longer stanchion; older style silencers. Only one model (later known as Fastback). 745cc [73mmx89mm] same dimensions as the Atlas |
| 128646 |
750 |
new type sleve gear & layshaft pinion tooth form |
Year 1969 |
| 129897 |
750 |
Rear wheel security bolt; new frame; added lower small tube to steering head. Approx Jan 1969 |
| 130979 |
750 |
Engine prefix 20M3S. Points in timing cover; integral rpm drive; Apex oil control rings. Models: Fastback, S Type and Roadster. |
| 131180 |
|
First Fastback model designation. Approx March 1969. |
| 131257 |
|
First S model: smaller rounded (Roadster type) tank; high level parallel pipes on left hand side with reverse cone shape silencers; first with ignition points on end of camshaft; tachometer drive inboard; six volt coilas with ballast resistor. |
| 132576 |
750 |
fibre clutch friction plate |
| 133668 |
750 |
Fastback model receives "S" type modifications: points, coils. Low exhaust pipes, upswept silencers, reverse cones, |
Year 1970 |
| 135088 |
|
Last S model |
| 135140 |
|
First Roadster |
| 136618 |
|
Starter motor blanking plate fitted. Original starter was to fit into old magneto recess. |
| 138973 |
|
Tapered middle compression ring fitted |
| 139571 |
Fastback Mk II |
Reverse cone silencers from Roadster fitted. September 1970 |
| 140061 |
|
Plastic rocker feed pipe |
Year 1971 |
| 141783 |
750 |
New style front forks without fork gaiters and featherbed type yokes with bare chrome stanchions; non adjustable sealed steering head bearings; 4.10 front tyre (same as rear); Lucas handlebar switches; indicators; centre stand mounted on engine plates (was on frame); shock absorber fitted in rear wheel. |
| 142534 |
Roadster Mk II; Fastback Mk III |
New style front forks - non adjustable sealed steering head bearings, with 4.10 front tyre, Lucas handlebar switches, centre stand on engine plates (was on frame); new oil tank; right hand cover for Fastback. |
| 145234 |
|
First SS model |
| 146074 |
|
First Hi-Rider model. Models are Fastback, Roadster, SS and Hi-Rider, also Fastback LR (steel tank). |
| 146584 |
|
S.E. spring expander oil control rings |
| 147730 |
|
rear brake drums screwed and riveted |
| 147846 |
|
toughened kick-start pawl |
| 148895 |
|
modified intake valve guide |
| 149670 |
|
oil seals on intake valves |
| 150120 |
|
oil pump gasket fitted |
| 150723 |
|
Last SS model |
| 150765 |
|
Battery tray /airbox back plate modified |
| 151175 |
|
Increased chamfer on tappets to increase oil drain from cylinder head |
| 152000 |
|
rear drum strengthened webs |
| 152499 |
|
replaceable foot pegs |
| 153150 |
|
riveted clutch backplate |
| 153324 |
|
tachometer housing gasket |
| 153362 |
|
chain case cap O-rings introduced |
Year 1972 |
| 200001 |
Fastback Mk IV; Roadster Mk IV |
New crankcase castings with breather moved to between gearbox plates behind engine (was on left hand end of camshaft); Engine number Prefix discontinued; "Optional" disc brake and combat engine; Fastback, Roadster |
| 200001 |
750 |
Revised shape handlebars (Tomaselli) |
| 200001 |
750 |
disc brake first offered (with first Interstate) |
| 200004 |
750 |
Cylinder head with increased intake valve support (deleting 2NM23392 heat insulating washers.
Oil feed return pipes common sized to 17 inches.
Roller bearings introduced on timing side mains (not Superblend) |
| 200708 |
750 |
Tappet locating plate replaces NMT2142 |
| 200976 |
750 |
First Combat model: compression raised to 10:1 by machining head; double S camshaft fitted; black barrel; 32mm carbs. |
| 201778 |
750 |
Clutch plates scrolledoil slinger groove |
| 202116 |
750 |
Four terminal master switch |
| 202341 |
750 |
valve spring bottom seal washer thinned to accommodate cylinder head variations to 202666 |
| 202666 |
750 |
Cylinder head amended to accommodate NMT2071 heat insulating washers (reverted to 06088 1971 style) |
| 202760 |
750 |
revised front brake lever - disc master cylinder |
| 203136 |
750 |
front drum brake support plate introduced |
| 204049 |
750 |
Grooved cam &: plain bushes changed to smooth can journals, grooved bushes |
| 207197 |
750 |
Superblend (barrel roller) main bearings introduced |
| 211110 |
750 |
First detuned post-Combat 750 engine |
| 212278 |
750 |
Clutch plates scrolledoil slinger groove; bronze clutch friction plates; crankshaft to flywheel assembly changes to dowels & studs; flame ring head gaskets; RM21 (125 watts 5000RPM) alternator |
| 212278 |
750 Interstate |
Interstate: larger 5 gallon tank; longer seat; low level Interstate silencers; turn signal indicators. Small sump plug introduced; later models had car type oil filter; rear brake shoes lost girder fork speedo gear clearance bend. |
Year 1973 |
| 220000 |
Roadster Mk V; Interstate Mk V |
Combat engine abandoned; 32mm carbs from Combat retained for all and they worked well with reduced compression and raised gearing; Black Instrument pods; turn signal indicators optional on all; disc brake on all but Hi-Rider which retained 8 inch front brake.
Models are Roadster, Interstate and Hi-Rider. Fastbacks dropped from range. |
| 221317 |
750 |
stellite tipped intake valves introduced |
| 221545 |
750 |
improved centre stand P/N 064031 |
| 230000 |
|
square rear light; altered fork geometry; improved box section head steady |
| 230935 |
Last 750 |
last 750 Commando |
| 300000 |
Mk I 850 |
first 850 motor [828cc /829cc 73mmx77mm]; balanced pipe in exhaust system; barrel fixings altered; bronze clutch plates;strengthened swing arm; larger sump plug reintroduced. Roadster, Interstate, Hi-Rider all disc brake. April 1973 |
| 300003 |
Mk I 850 |
strengthened swing arm |
| 301700 |
Mk I 850 |
Quick Action throttle introduced |
| 302000 |
Mk I 850 |
improved rear chain oiler |
| 305428 |
Mk I 850 |
improved rear wheel bearing spacer |
| 306591 |
Mk IA 850 |
Homolgated model for Europe with larger, quieter black air-box and peripheral (annular) discharge silencers (bean can); chain guard plastic extension added; 2nd gear raised by one tooth (to reduce noise readings). Roadster and Interstate only. |
| 307091 |
|
slimmer Interstate tank, 4-1/2 gallons approximately |
Year 1974 |
| 307311 |
Mk II 850;Mk IIA 850 |
longer battery crossbar; improved paint; 30mm ports but 32mm carbs (for flexibility);various small detail mods eg mudflaps; third sleeve gear bush added; black and blue tanks dropped; red and a few "traditional" silver tanks; fork gaiters reintroduced and lower handle bars; tachometer drive oil leak reduced (?). 850 motor with black barrel, available as homolgated model Roadster and Interstate only, called Mk IIA for Europe. For U.S.A. with old type silencers and air filter, Roadster, Interstate and Hi-Rider called Mk II. |
| 309600 |
|
larger stronger kick start |
Year 1975 |
|
|
Mk III electric start (left shift) and Mk II kick-start (right-shift) offered for sale January 1975 |
| 325001 |
Mk III 850 |
First electric start; left-hand shift; rear disc; front disc on left side; adjustable isolastics; silicon bronze valve guides; RM23 alternator |
| 336539 |
Last commando |
|
