Lawman86

CDI was my first guess. I’ve measured several over the years with an ohmmeter and the factory specs and it’s usually really quick to rule out. You should be getting a bright blue spark. Also 8 volts to the CDI could mean there’s a small section of the wire that’s pinched, chafed, or just a low battery. 8v is not enough to do anything. I’ve had to reword several bikes and Fourwheeler’s due to corroded wires. That green crust will cause a low reading as well

As everyone else has said check those things, also try and locate a service manual. They are miracle workers sometimes. I would check rectifier sign the known good values. They are easy to pull out and check them or leave them in. Also check the battery itself.. I’ve had my fair share of luck with factory dead cells.

Yes they are known issues. If you can locate the ohms values +/- a few ohms you should be good to go. If is not the CDI I would check they charging system output. I know on a few atv’s and dirt bikes that won’t run At all without the charging system running at all times to charge it all.