Hi allpaso750 wrote: But, according to giocast that´s all ok.
I really wonder what the real problem is.
G.
Just to 99% put this one to bed - After over three weeks of trawling through various Forums, I stumbled on a thread describing a 1991 900SS with identical symptoms to mine. His problems started immediately he fitted new high compression pistons, and he eventually cured them by changing original Digiplex system to Kokusan (with adjustable pick-ups) I immediately went to peer through spark plug hole at TDC and Voila! - that unmistakable 'V' wedge clearly atop of piston. I am incapable of fitting Kokusan pick-ups right now, despite having all necessary bits, but will post as soon as it's running.