BN2 Timing

[Haluk Taysi]

A friend asked me to help him correct his very rough running BN2 this last
Sunday. I don4nt have any experience with 100/4s but timing etc. are routine
for me on my BJ7 and Bugeye Sprite. After adjusting the valves I went by the
workshop manual and located TDC (not very easy with my 65 year old eyes with
glasses)by checking valves 7&8 as they both stopped moving. Then opened the
contact gap and that supposedly gave me 60BTDC. There are no timing marks on
this car and the book recommends further adjustment (dynamic?) by trial and
error with the vacuum advance unit (no stroboscobic timing adjustment
possible). After checking the carbs the car ran very nicely. However, I would
like to do this process more accurately. Any help, material to read?
Cheers,
Haluk Taysi