Hello.
I was in my garage yesterday evening. I swapped over the CDI units. I tried to start engine. Engine did not show me any sign of life. I took out spark plugs and did not see any sparks on both. I returned wires on CDI's back in the places were they were originally and checked the sparks. I saw only one spark on the front cylinder. I swapped over CDI's again and got sparks on the both cylinders. In my opinion sparks were quite weak. But I tried start the engine in this condition. Engine started on the both cylinders. The tachometer was working. The exhaust valves was working too. So I do not know wot I have to think.
I going to go to my garage on the weekend warm bike up and stir the wires when engine is working. May be I can locate a place were the problem hide.