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My guess is that I would just let the bike coast to a slow enough speed that you can bail. It's kinda like doing no-hands where the bike is still balanced at speed.
At the end of the day, unless the guy who wrote the question actually had that happen and came out unscathed I would think that it's all theory.
You could still do a controlled stop. Lean forward and steady the front end by grabbing anything you can, top of fork tubes, or signal lights if they're attached. I'd have the bars on the tank and keep them steady with your elbows so they didn't drop. You wouldn't want the throttle cable to get yanked on full. Use the rear brake to slow down. Lean with your weight to keep the bike going down the center of the lane.
I've had a handle bar break in half. It was on an old dirt bike, didn't have the top reenforcing piece. Just one solid bar, it broke right at the clamp and I was left holding the bar and throttle in my right hand. Just applied the brakes and managed to stop with out crashing.
It is a dumb question to ask, but I can see it's a test to see if you're thinking.
Closing your eyes and praying is not an option. Remember what Evil Kenevil said. If he has one hand on the handle bars he is still riding the bike no matter how the rest of his body or bike is oriented. He was referring to some of the spectacular crashes he had on bad landings. So I've always remembered that and it's served me well over the years. If you're crashing, keep riding the bike there is a good chance you're going to land on the seat and ride it out.
But there is a thread on here somewhere about a guy who had his handlebars break while riding, which I can imagine would have pretty much the same consequences -- might not be so stupid a question...
I remember that thread. As I recall he hit a pretty bad bump he didn't see due to it being under a dark overpass. His aftermarket risers snapped off at the base.
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