3 and 4 not firing

[Trent]

we got this 78 cb750k free on the side of the road!!!

tore down the top end and cleaned all the rust out of #1 so the motor runs now but the 3 & 4 are not firing every time? we put new plugs and points. its funny that ist the 3 and 4 that arnt firing? (((Waiting for the rings on order was awfull))) we are gonna clean out the carbs cuz the floats are sticking and drain out the overflow if anyone has an IDEA please and thank you???!!

[JonnyB]

You need to check the wireing leading back from the point to the coils. most likely problem is bad earth.

[CBen750F1]

is it only missing at idle, or every were?, if its at idle, your bleed air jets(slow), may well be blocked... which on the 750 carbs is an easy thing... if its everywhere then check your spark... peace