James Dabill retained a three mark lead after he and closest challenger Dougie Lampkin completed day four of the Scottish Six Days Trial unscathed.
Leeds rider Dabill, who won the event in 2007 and 2011, recorded his third unblemished day of the week so far, with Lampkin also avoiding any dropped marks to remain firmly in contention for an eighth successive overall victory.
Lampkin pulled a mark clear of Michael Brown, who is now closely behind in third after dropping a solitary mark.
Dan Peace remains fourth despite dropping two marks, with nine dropped overall for the tournament, while Jack Price remains a mark further behind.
Killin’s Andy Anderson is seven marks clear of Joe Dawson in the race to be the best Scottish rider.