I am actually looking for the circuitry of the box itself, so i can build a replacement box from scratch. My old one has died on me & i cannot afford to buy a new one.
This guy seems to have built his own cdi box for a different bike which gives me hope

Any help would be greatly apreciated, i'd very much like to be able to repair this.
I'd also be very happy to buy a second hand CDI box if someone has a spare to sell.
thanks very much