Sounds to me like the Evel Knievel may not have the Solenoid driver  C23 capacitor replaced ? I often see Alteks in games with the original C23 on the SD board. This will cause the issue you are describing.

I'd contact the distributor to see if warranty is still covered ?

EK game does have a rottendog driver board installed. I will try a new Alltek Cpu in the Ek during the week and let you know . I reckon problem is in the cpu board i will contact them and see what they suggest