After the last nightmare with the castle nut (took 2.5 hours to drill out), I now have another problem on the other engine that I am doing for someone.
The longest engine casing stud (the one near to the kickstart shaft) appears to have a load of rust/corrosion around it and won’t shift.
I have tried soaking overnight in WD40 and heating the casing but it won’t shift.
Any ideas ???