He won the Lightweight and 350cc Junior Classic races, either side of Swallows' 16th win in the 850cc Classic.
The event, featuring bikes made before 1972, is a TT curtain-raiser and takes place at Billown Circuit.
Meanwhile, Vince Biggs and Vicky Cooke won both of the Billown event's sidecar races.
Jamie Coward, Iain Robertson and Steve Ferguson also won races at the Pre-TT Classic which has been staged at Billown each year since 1988.
English rider Mike Hose claimed two wins at the Pre-TT Classic in the Isle of Man on Monday to move level with Bill Swallow's tally of 16 victories.