I know this one has been put out here before but this one has a twist in the tale.

Every now and again my bike starts up and runs on the left cylinder only. It can do it like 10-15 times consecutively and then stop for a while and the start again.
The twist is that after it warms up, anything between 2 and 15 minutes, the right cylinder kicks in.
If I stop for a short while and the engine hasn't yet cooled down completely, it starts up just fine with both cylinders running.
Any ideas?

I forgot to add that we cleaned out all connectors and CDI unit along with carbs etc.
Also, when I change spark plugs all work fine for a few days.

Last edited by Bedouin; 06/08/2017 3:49 PM.

Bedouin. Blessed are those eyes that have seen more roads than any man! (Homer).