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Too tight and the belts can fail early as it's dragged over the pulleys, Kevlar is used a reinforcment and that doesn't like being stretched and will start produce fractures in the fibres. Too loose and it will start flapping around, well more resonating and that adds more load to the belts and the reinforcement can fail.
So in both cases they can fail early, snapping is rare but it does happen or if the damage to the belt reinforcement is enough stretch and skip on the pullies especially if they are too loose to start with.
Any fail is a bit of a disaster, you really don't want to see the mess it makes of the piston crown and valves.
I'm sure someone has a toe curling picture or two they'll be happy to post
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"The final measure of any rider's skill is the inverse ratio of his preferred Traveling Speed to the number of bad scars on his body." Song of the sausage creature
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