Ex husband has property belonging to child.

If you don't have the baikes as of now, check your Decree of Dissolution for the property awarded to husband.  Looke there to see if the bikes are "legally" his.  Also, check for property awarded to wife - are the bikes listed there as going to you?  If the bikes are not listed in either of those paragraph's do the property award paragraphs say "wife is awarded all that property now in the possession or control of the wife"?  If so, and the bikes were in your possession at that time, then you can take him back to the family law court, on your divorce action.  Ask the judge to find him in CONTEMPT (disobeying a court order) and ask for the bikes back.

Good luck.