CB550 Does the coil go bad?

[BNR34RB26DETT]

I own a CB550 thats been running ok until today it suddenly lost spark at cylinder 2 and 3. As some of you may know, 2 and 3 is fed by the left coil.
I checked the wiring and everything seem to be hooked up. Both left and right coils are warming up when i try to crank the bike and bike does start up on cylinder 1 and 4 (I can feel it warming up on 1 and 4 headers)

Is it common for the coil to go bad?
Could it be some other issues that's causing loss of spark at cylinder 2 and 3? I would like to narrow down the issues before getting a new coil to test with.
How about the points? should i check on this? I have never opened them as the bike never had issues like this before.

Any comments/ suggestions would be appreciated

Thanks!

 

[mydlyfkryzis]

Switch 2/3 coil with 1/4 coil....if 1/4 now miss, it's the coil.

But before doing that, swap the plugs. The coils on that are dual fire, so if one of the plugs is back, neither fire...

 

[xb33bsa]

it is much more likely the points, check them,one set is likely closed down,
.......a points check/tuneup along with timing verification every 1000 miles minimum,learn to do it

 

[mydlyfkryzis]

XB is right on

Sent from planet Earth using mysterious electronic devices.