Ian - there is no need for the patronizing response which you apply to the majority of your posts, my son is 9 years old and like said above the kids dont have the neck muscles or particularly great neck support at such a young age.
As for me I'm more than capable of deducing the effects of with and without..... recently my son has a full frontal head on crash (front bumber to front bumper) after he spun his kart on the exit of a fast corner, the resulting crash bent our chassis 15mm upwards, requiring me to change it, but my son carried on and finished the session like normal......the other lad went to hospital with major whiplash injuries.
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