For the moment, I've grouped the MK II through M machines together as mechanically they did not change very much, other then for paint and trim. Refer to the Country Specific section for details about your specific model.
Model Year 1969 (MK II)
Frame number restart at T500-20001 (see the section on Production Numbers previously), so there is a gap of about 4000 numbers between the last MK I and the first MK II
The change to the VM32 carburettors also included the addition of longer inlet tracks. This style continued through till the end of production (a set of 'B' carburettors is shown).
Per the sales brochure, it appears both the 'touring' grips and the thin grips were offered.
The handlebars had a pronounced curve, and the cross brace was hollow.
At the start of the 1974 model year, Suzuki finally addressed the low oil level issue in the gearbox by installing a dam in the gearbox and increasing the oil to 1400cc's. This change is detailed in Sevice Bulletin T-3 and can be found on this page. In 1976 the crankcase casting was changed so the dam was no longer required, and as well the lettering was changed on the outside to indicate the correct amount of oil required. However - Suzuki never did correct the oil indicator level hole position on the right side cover as can be seen to the right. Just click through the photo stack to see some examples.