Honda-SOHC

hi all hope someone out there can help i bought 1973 k2 cb500 four usa model very rough spent 1 yr cleaning stripping repainting etc came to start engine fired on all 4 cylinders then nasty noises turned out 3 gears broke engine out again srip new gears rebuild back in frame pressed starter fired only on 1 and 4  swapped blue and yellow wires to coil 23 run ok not 1 and 4  found fault on ht leads so bought new coils and condensers points ok new plugs  checked for spark without plug caps sparks on all cylinders, plug caps back on will not start battery low at this point so charged it up ,fully charged switched on no lights on panel bike dead ? checked fuse blown new fuse
all lights back on pressed starter fuse blown put new fuse in now turns over but will not run  stood looking with ignition still on saw blue wire to coil smoking turned off swapped blue and yellow wires yellow one smoking thinking must be a short on blue fron points to coil by passed this wit a wire made up turne ignition on this smokes as well so no short on blue wire in main loom i am lost at this point anybody out there any answers many thanks blade918