How old is the battery?
Compression test done, all 4 pots reading 120 psi which is well below spec (210 psi per the service manual). Doesn't look good, but strange that they are all exactly the same value. If i'd fried the pistons/rings surely they wouldn't all come up the same?
Is your battery definitely fully charged? Drain the float bowls, lift the tank, turn off the fuel tap.Remove the fuel line and connect it up to a portable fuel container filled with fresh fuel. Turn on the ignition and wait until the fuel pump stops ticking, switch off the ignition and switch t one again, keep doing this until the pump stops ticking. Now start it, let us know how you get on.
have you tried brake cleaner in the intake mate? that'll tell you if its fuel starvation