Here is couple things to check on this coil.
Disconnect the kill lead at the coil and see you now have spark. If you do then is a short in kill wire circuit.
Another to check is the high tension (plug wire). These have wire push spring terminal. These have a tendency to break the internal wire of lead. The lead itself is replaceable if need as just off the bad portion does make the lead too short most times.
As for the coil itself look for the Hitachi 6687652 which supersedes the Tanaka 1672054090.
You can get this through
Hitachi 6687652 but they have it listed as special order.
I have a vendor on this side of the big pond that has 2 in stock but I would think shipping would a killer. I think a little searching the above might show what is available in your region.
