I have a Big Red 3-wheeler, one day when I was riding it, it just shut off like I'd hit the off switch. I have replaced the coil & spark plug, neither of which fixed the problem. There is the cgi box and I guess these things have a little generator/alternator. Any ideas on how to trouble shoot the problem?

 

what year? did you check for spark?

 

Year is 1986, there is no spark