Veteran jockey David Walker has been suspended from riding for seven years after being found guilty of race rigging charges.

Walker, 38, was found guilty by the Judicial Control Authority on Thursday of not giving his own ride every chance to win a race in which he'd already bet on a rival.

A follow-up hearing of the JCA on Friday deemed Walker should be punished heavily after he admitted the charge of betting on a rival horse, St Ransom, but denied not riding his own horse, Watch Your Man, on its merits in a race at Awapuni on August 16.

As well as the ban, which will effectively end Walker's career, he has been fined $NZ3000 ($A2800).

RIU general manager Mike Godber hopes the punishment will act as a deterrent to any other jockey considering a similar action.

"Mr Walker's actions threatened the very fabric of NZ racing and the strong penalty applied by the JCA panel sends a signal that the industry holds the integrity of racing at the highest priority," Godber said.

"The message is clear, serious breaches such as this case will have severe consequences for those involved."

Godber says the case also underlined the effectiveness of the RIU's system of surveillance of racing and betting and its investigation processes.

A judicial committee of Murray McKechnie and Noel McCutcheon on Thursday said Walker could have done more aboard Watch Your Man after a hearing at Trentham racecourse.

McKechnie said evidence suggested Walker failed to give his horse adequate opportunity to improve mid-race, and should have ridden more vigorously in the home straight.

A charge for not riding his horse Lil Mer on its merits at Waverley on July 31 was dismissed.