I adjusted the handlebars on my bike once, and apparently didn't torque down on the 4 pinch bolts tight enough, the position held up fine until I tried to use handlebars and feet on forward controls to partly lift my ass off the seat to reduce a bump, and that caused the bars to fall halfway down.
If it's a bike where this slipping has happened a lot, there may have been some scrubbing out of the aluminum biting surface, and a shim between the handlebars and the clamping surface to tighten things back up would be needed.
Sorry to hear about his crash, glad it wasn't worse. Tell him heal up soon for us.
He has had his bike in the shop twice because of loose handlebars, the last time he was told they were fixed and it shouldn't happen again. As he was going around a curve the handlebars collapsed around the gas tank.
He has almost 30k in this bike, well had, you'd think that kind of cash would get you solid handlebars, guess not. Thanks for y'alls help!
Welcome Tex! 5 ribs? Ouch! I hope he heals up quickly.
I changed my own handle bars and had to make a further tightening because they loosened up a bit. There was plenty of warning for me because they only moved a bit when applying my full weight on them, Pushing the bike with the motor off to maneuver it around the parking lot.
What model bike is it?