Re: dumbfounded newbie here in KS
The bicycle computer is receiving interference from the engine's ignition system.
Try as Jbomb suggested. For some a wired version works well, for others it makes no difference.
Another thing you can try is to mount the CDI box onto the seat post tube.
Try to get it as far away from the bicycle computer and wiring as possible.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.
Does not come with a fortune cookie."