Coleman ct200u ex minibike starts, then stalls

Have problem with my Coleman ct200u ex that is driving me batty.

It starts, runs for about 15 seconds, then dies, almost as if it ran out of gas suddenly or the kill switch was pressed. Will not start immediately. If I wait about 30 seconds, it will start right up, run for 15 seconds, and repeats stall. Tried playing with choke, carb settings, to no avail. Starts, runs 15 seconds, then dies.

First I thought it might be a clogged carburetor. Cleaned it (no go), then replaced it (same problem). Then thought fuel was not getting through line, so replaced fuel line and added fresh fuel, changed spark plug, cleaned air filter.

Could this be electrical? Dies almost as if kill switch was engaged.

Any insights would be much appreciated.

Thanks.

Sal