Cold cylinders

1979 KZ 650.

My first question is this: After a minute or so of startup, is it possible the two pipes closest to the exhaust will be significantly more hot than the two further away?


I have spark in all 4 plugs, but she seems to be running slightly rough~~ So I felt the 4 pipes coming out, the left 2 were relatively cold and the right two were hot. This made me think that only 2 cylinders are firing..... which doesn't make much sense since I have spark all around and that the two obviously firing are coming from seperate coils.


The answer I'm looking for is whether my investigating has shown the left 2 cylinders(cold ones) to be not firing or that I have not let engine get hot enough and they are probably firing.



* I will address the running rough after. Could be timing.


Thanks

you might only be getting fuel to two carbs you can check with the drain plugs on the two that arent running