oops.. i posted too soon.. you got points and a condenser? in your profile the bike is a "1976 Jawa Transistor 40" .. wonder what the transistor thing is about if it's not a transistorized ignition..
Well.. anyway.. my next step would be to isolate the basic ignition components from the rest of the wiring and switches. Disconnect everything else.. (Imagine substituting a spinning magneto for the battery in this pic) Then check for spark at the spark plug.. remove the plug and ground it's base to the engine block and kick the engine over.