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Differences between early T160 and Late T160 Tridents;  In order of parts book.

1.    Oil Feed pipe stub increased to 3/8” from 5/16”.
2.    Early T160 heads don’t have H.D.A. cast into them
3.    Early T160 Rocker boxes have 71-2535/6 castings later have 71-4245/6
4.    Early T160 don’t have tacho cable support wire with grommet
5.    Early T160 have ‘Finned’ outer exhaust clamps
6.    Early 626/66, 67 have lighter throttle valve springs and a return spring on the throttle gantry, later just have  throttle valve springs.  Also 71-4400 operating arm spindles are shorter on the later units
7.    Early inlet manifold stubs had a stepped groove machined in them, later ones have not.
8.    Early gear change inspection covers had 5 speed decals attached
9.    Later 5 speed layshafts had a stronger 5th gear design.
10.    Later t160 starter motors had a different rear end shield and made during 11/74
11.    Early outer primary covers had the T150 centre mount casings just machined off level with the quadrant face; also original thrust plate mount from T150 remains separate not integrated and no stop for gearshift pedal spindle, a second version also was used. (3 different types used)

12.    Early T160 gearshift pedal spindles 57-4923 were attached differently; the early ones become loose after use.
13.    Early frames have integrated R/H front engine mount, Very late (BN07XXX) have Fabricated Headstems
14.    Later frames have a different L/H & R/H front engine mount bracket.
15.    Later frames have rubber mounted rider footrests, with different footrest rubbers
16.    Early models have round reflectors on headlamp brackets
17.    Early T160 had silver square drive brake lever 83-5401 that had to be recalled.
18.    Early T160 had solid oil cooler straps, later ones were hollowed
19.    Early T160 had clear fuel pipe assemblies later had black plastic
20.    Early T160 had no cut out and grommet on the oil tank styling cover 83-5362
21.    Later T160 had  larger feed hose 70-8904
22.    Later T160 had Stainless Steel Fenders
23.    Early T160 had Nylon lined Clutch cables, later were not.
24.    Not sure if wire harnesses were changed, with AMP connectors for example.

I have not included USA, UK or European variants as these are in the parts book

I am using my XK0021X and NK064XX as examples

Would be of interest for future restorers at what point these changes occurred (engine #)
Same goes for T150 and R3 variants over the years of production.

Please feel free to correct any of the above as XK0021X was second hand, NK064XX is original one owner.