blades44

Hi having trouble with mis fires over running, and backfires. I have checked coil, removed small filter in carb ,cleaned all jets , checked inlet manifold rubbers, clean petrol, all slides are moving good (checked with mini camera through the air box, clean new filter, new iridium plug and cap. Checked lead from cap to coil taped up with self amalgamating tape. Still the same. Standard bike, including the exhaust. Any ideas, the only thing i can think of is the CDI unit, or TCI unit on this model. Transistor Controlled Ignition. I tried a working cdi unit today still the same. Going to try another set of carbs and new carb rubbers. Any ideas, driving me mad and the better weather is now coming in and itching to get out again. Thanks Chris