Marc,
There is a guide on tuning the PB321C in the TOC Technical Library, here: http://traction-owners.co.uk/members_only/tech/Brochures/Solex/Solex%20PB.pdf
Please note that the Username and Password that you are prompted to enter are those that were on the confirmation of subscription letter that you received when you subscribed for the current year.
If you have misplaced these, please contact the membership secretary (membership@traction-owners.co.uk)
Anonymous