Fantastic, rare and vital vintage Motorcycle Mechanics guide to dismantling your early 1960s Bultaco - 4 speed, Tralla, Metralla, 125 TSS
Great photo-illustrated, captioned feature, covers special-tools.
Read this as you go -nothing to fear, by following this!
Three page/side article is in original 5 0+ year old magazine, when these engines were in daily use
See my other listings for more rare classic performance tuning/rebuild literature
I will post globally and combine postage to save you money