Hi all, just about at the end of my tether with this one...

bike is only firing on two cylinders 1 and 4.... 2 and 3 are cold So I suspected the left hand coil pack. I have replaced the coils done the checks in the Haynes manual. They seem fine. I have checked the plugs for spark. The spark seems very weak. The bike will not run, and cuts out as soon I try and rev her...pulse generator tests good. Throttle sensor tests good. Fitted new plugs. Any body else had this issue?? I am considering replacing the CDI unit???

any help really appreciated

thanks