I had put pics about differences between 87 and 86 tecate ,
The most important differences between 87 and 86 are in bar, pic 1 is 87,pic 2 is 86,87 has keyed ignition,support for head light,different front master brake pic 3,(lever, rubber and hose),different clutch lever and support pic 4(has rear brake),clutch cable is different too has different part number, rubbers in clamps for bar ,Rear brake disc in 87 is bigger that 86(pic 7 and 8),rear brake in 87 has parking brake pic 9,without in 86 pic 10,rubber in chain guard in 87 not in 86 pics 11 and 12,rear brake hose for 87 and 86 different too pics 17,20,reservoir bottle for rear shock in 87 has one wheel in 86 two wheels pics 13 and 14,rear wheels are different too l 87 has the same that tecate 4 and are painted (front wheel is painted too) pics 15 and 16.
Other pics are labels,different too except warning labels in left side ,warning label in right side is bigger in 87 that 86,87 has in fuel tank one label with gear indicator and other label in front shroud with on off for key switch pic 18,i had tried to charge pics about labels but i cant.
I hope that you are understand it.
Javier