HOW TO BAG THE BEST DEAL
Steel beneath the lightweight glassfibre body is very rust-prone. Check all metal components, especially the floorpan. Impact bumpers were added from 1973.
2 ENGINES The earliest were 748cc three-cylinder two-strokes from the Saab 93. The Sonett II (only 258 were made) had a two-stroke 841cc. The triple sidedraft carbs will need careful fettling. The V4 petrol-engined cars
are distinguishable by their bulging bonnets. The most numerous surviving cars are the Sonett IIIs (1970 onwards). Check for leaks and excessive smoke, and inspect the service history. 3 GEARBOXES
V4 transmission has a pinion nut prone to coming loose, usually indicated by peculiar speedo needle readings. Look out for excessive clutch wear, and listen for any clonks and vibrations. The fourspeed manual’s gear
lever moved from the column to the floor with the Sonett III.
4 TRIM &
INTERIOR The interiors suffer in hot climates. Check for leaks and damage to leather, carpets and trim. Equipment can be delicate. 5 BRAKES
All Sonetts have a dual-line braking system, with a ‘type III’ master cylinder. Look for signs of leaking fluid from the brakes, and test them heavily for even braking.