Walsh (52) won on Willy Duggan, Ratnarj, Il Poverino, Desert Saboteur, Premier Lady and Hemingway on an 11-race card at the Greymouth meeting.
His other six-win haul was at a Wairoa meeting in February 1992 when he won with Mirabella, Lucinda's Star, Kiwi Bond, Merrett, Totem Pole (Wairoa Cup) and Vain Lorraine on a 10-race card.
The Christchurch-based Walsh has now ridden 2258 winners in New Zealand, 100 away from the record tally set by Lance O'Sullivan, who retired in 2003.
Walsh had his first race ride in November 1974 and his first win the following month.
He had his first win on the Greymouth track, Omoto, on Elvin Pride in November 1975.
He won the Greymouth Cup on Robanna (1977), Royal Adder (1986) and Bornithestates (2008).
Walsh will now turn his attention to the Wellington Racing Club meeting at Trentham next Saturday. He has been engaged to ride So Elusive in the $300,000 group one Telegraph Handicap (1200m). Walsh rode So Elusive to a last-start win in the open 1250m at Waikouaiti on January 1. The Michael Pitman-trained So Elusive won the Pegasus Handicap at the New Zealand Cup meeting with Lisa Allpress the rider.
Walsh won the Telegraph on Tanalyse (1986) and Courier Bay (1987-88).
Noel Harris and Chris Johnson were other senior New Zealand jockeys to win races on Saturday.
Harris, who turned 57 on Saturday, marked the occasion with a win on Galaxy Star at Awapuni. He has the mount on Vonusti in the Telegraph Handicap. This was a winning combination in the race two years ago. Harris has also won the Telegraph on King's Chapel (2004) and Fritz (2000).
Johnson (47) won the Greymouth Cup on Noble Warrior. It was his third successive win in the race after Bruce Almighty (2010) and Rock On Rye (2011).
He rode Vivz to win the race in 1994.
• Kelly Myers was suspended from January 22-26 inclusive for careless riding at Awapuni on Saturday. She admitted allowing her mount Stella Bella (race 4) to shift out in the run home, causing a check to Galway.
Dicky Lui was suspended until midnight on Friday for careless riding at the Westland meeting on Thursday. A charge of careless riding against Lee Callaway at the Westland meeting was adjourned until Gore on Saturday.
Casey Lunn was suspended until midnight on January 26 for careless riding at Omoto on Saturday. Lunn, the rider of One Chance (race 11), admitted shifting in and causing a check to Second Hope in the early stages.
A protest by Michael Pitman, the trainer of Sub Prime, who finished third, against the first and second placed horses, Big Red and One Nite Stand, was upheld at Omoto. Sub Prime was squeezed out of a gap between One Nite Stand and Big Red over the closing stages.
• Action over a positive test from Lozada has been discontinued after the B sample tested negative.
A urine sample taken from Lozada, trained by Peter McKay at Matamata, tested positive to Xylazine after the horse won at Te Rapa on November 5.
McKay instructed New Zealand Racing Laboratory Services to forward the "B" sample to the Australian Racing Forensic Laboratory in Sydney for testing. The Racing Integrity Unit said the sample did not detect Xylazine and action had been discontinued.
