Bulls coach Bill Cartwright, who has owned a motorcycle for 10 years, said he was unaware guard Jay Williams had recently purchased a motorcycle and had not seen the need to warn his players to stay off the machines.

Williams, his agents and the Bulls must consider how the player's accident Thursday affects the status of his contract, which prohibits riding motorcycles as a sport.

According to paragraph 12 labeled ''Other athletic activities'' under exhibit A of the collective-bargaining agreement, ''the Player agrees that he will not, without the written consent of the Team, engage in (x) sports endangering his health or safety (including, but not limited to, professional boxing or wrestling, motorcycling, moped-riding, auto racing, sky-diving, and hang gliding), or (y) any game or exhibition of basketball, football, baseball, hockey, lacrosse, or other athletic sport, under penalty of such fine and/or suspension as may be imposed by the Team and/or the Commissioner of the NBA. Nothing contained herein shall be intended to require the Player to obtain the written consent of the Team in order to enable the Player to participate in, as an amateur, the sport of golf, tennis, handball, swimming, hiking, softball, or volleyball.''

Chicago trainer Tim Grover and local agent Mark Bartelstein said they warn their clients in private briefings to beware of risky recreational activities that could result in injuries or death.