Posted by "bstom" in regards to loss of throttle control on a drive by wire bike...
Sounds like the switch housing was mounted too far out on the handle bar and the teeth on the handle grip were just barely engaging the teeth on the throttle sensor. It is also possible that something in the grip or the sensor broke, you'll need to pull the grip off to see. Still under warranty? If you have the torx bits, it isn't a difficult job. You don't need to remove the brake lever mirror mount, just split the switch housing and pull the grip off. There is a slot around the inner end of the grip which engages a ridge on the switch housing. If the assembly was mounted too far out on the handle bar, just loosening the screws on the brake lever mount will let you slide it a little toward the center of the handlebar. You should do that with the twist grip re-installed. Some guys have had the opposite problem, the assembly is mounted too far inward and the twist grip binds and won't spring back to idle. If you slide the whole shebang as far to the center as it will go, then back outward a small amount (1/16" or so) you should have good engagement of the gear teeth and NOT have any twist grip binding.
Sounds like the switch housing was mounted too far out on the handle bar and the teeth on the handle grip were just barely engaging the teeth on the throttle sensor. It is also possible that something in the grip or the sensor broke, you'll need to pull the grip off to see. Still under warranty? If you have the torx bits, it isn't a difficult job. You don't need to remove the brake lever mirror mount, just split the switch housing and pull the grip off. There is a slot around the inner end of the grip which engages a ridge on the switch housing. If the assembly was mounted too far out on the handle bar, just loosening the screws on the brake lever mount will let you slide it a little toward the center of the handlebar. You should do that with the twist grip re-installed. Some guys have had the opposite problem, the assembly is mounted too far inward and the twist grip binds and won't spring back to idle. If you slide the whole shebang as far to the center as it will go, then back outward a small amount (1/16" or so) you should have good engagement of the gear teeth and NOT have any twist grip binding.