I have just , saturday , bought a bsa gold star . The engine is in many pieces and need quite a lot of sorting . Not sure about the crankshaft ,may buy new one , but it is missing the piston . The bore looks good but is worn / bored / honed to 86.44 . Looks honed but may have been worn then honed . The liner measures in english 3.4035 at the top and 3.4055 at the bottom a rebore would only be 3.4065 that would give me 0003 thou clearance . I believe a +60 is 86.52 . Standard bore is 85mm and 60 though is 1.52mm so it should , In my mind , be doable . What do you think .
Changed my mind bought a pearson crank , bearings , camshafts , liner and standard piston . Looking forward to this .