Topic: 73 cb500 no spark

[djoz371]

Hello all. Here is the deal. 1973 CB500 gift from the wife a couple years ago. Not to much ride time on it. I start and ride it around the block once every few months. Tried to start recently with no luck. I have no spark. I have ruled out the kill switch (power to the black & white at the coils). It has DYNA ignition system that looks pretty new. I am pretty unfamiliar with the electrical on these bikes but picking a few things up. Stator looks to be in great condition. Could the coil setup be bad? It has a new battery as well. I am a newb so pretty lost on electrical. It sits in a shed when not riding so not sure what would cause the spark to just stop. Any help is very much appreciated.

[bryanj]

Check the power lead to the dyna, there was a spate of dynas dying and on the 500/550 they put too much load on the charging circuit

[dave500]

start with every and all electrical connectors,clean all those gang plugs etc,the 500 only had one fuse,be sure its intact and contacts are clean,its often a simple fix if it was running before it was parked(weve heard that one?)

[djoz371]

Turns out that it has the 5ohm Dyna coils. They need to be disconnected to do an ohm test correct?