Flashing reverse light
Question, is the CDI box stock, I have seen this problem twice, also do you have instrument panel or lights? One unit had a 700 griz box in it, can't remember the year of the box though, the other was a popular aftermarket unit. The aftermarket unit displayed the problem with the light panel and the griz box with the inst panel. The griz box was all the time and the aftermarket unit was when the unit was rev'ed up in neutral for a period of time. Turn the key off and back on and the problem went away unless it was rev'ed in neutral again.