Hey, I found it.
CYCLE GUIDE, June 1985, Road Test, Honda VT1100.
“While both bikes use two sparkplugs per cylinder, the 700’s ignition fires its plugs every 360 degrees, whereas the 1100’s ignition includes a sensor mounted on the rear cylinder’s camshaft to kill the waste spark on the exhaust strode. The system is designed to eliminate backfiring during deceleration. The big VT’s ignition system also prevents its plugs from firing when the engine is turning less than 300 rpm, to prevent kickbacks that might damage the starter. As a further safeguard, a tiny clutch pack mounted on the starter shaft allows the starter gear to slip if any backfires should occur.”
In short, it has an automatic kill switch below 300 rpm. Hope this helps.