cured pulling to the right on braking-340 sport

Found cleaning disks and pads with brake cleaner the final answer I had also swopped left pair pad assembly over with right pair with outer metal plate all ok now. STill trying to get a bit more top speed , just purchased two larger rear wheels 22x10x10 KEV cunninghams suggestion£75 each , still seems same 45mph indicated on speedo 41 onsat nav might get them balanced feels more shaky. wonder what the variable advance refers to on section45 electronic ignition details on line engine manual ...Barry Singer