In 1969 the Sprint got a bigger 344 cc engine, and so the Sprint SS 350 was born. It was built in Varese by Aermacchi-Harley-Davidson. According to motorcycle historian Ian Falloon (bikesales, 2010) more than 15,000 were built before the big update of 1973.

According to Classic Bike Guide the 1970 model still has a four-speed box, kick-starter on the left, gear lever on the right, a dynamo and a 6-volt headlamp, plus a dry clutch.

In 1973 came the updated SS 350: a double cradle frame instead of the open spine frame, a Nippon Denso electric starter on top of the crankcase, 12 volts, a big battery under the seat and the gear lever on the left. The kick-starter stayed. The exhaust splits into two Lanfranconi silencers, and the brakes are 18 cm aluminium drums. The model was dropped in 1974.

Sources disagree on production numbers of the late model: the Italian register ARSIMA gives 3,441, Harley-Davidson figures give 4,137 (1973) and 2,500 (1974). At launch it cost f 4,075 (Dutch guilders) in the Netherlands.

SS 350, first series (1969–1972): spine frame, 6 volt, kick-start only. SS 350, second series (1973–1974): cradle frame, 12 volt, electric starter, left-foot gear change. Whether the last models had a five-speed box is unclear: Classic Bike Guide says yes, other sources give a four-speed box. Old Bike Mag describes a “1967 Sprint SS 350” with five speeds and a wet clutch; that differs from every other source and may refer to a European version. The off-road version is the SX 350.

Classic Bike Guide lists as known points: difficult starting (especially hot), a heavy dry clutch and a weak 6-volt headlamp on the early models. The 1973–1974 electric starter is known to be troublesome.

The Classic MotorCycle tested a 1974 SS 350 in 2012. After a long lay-up the steering head bearings were seized and the battery was flat. They also mentioned the awkward kick-starter, vibration through the seat and the extra frame tubes that make work on the head harder. Many parts are unique to the SS 350. The claimed top speed was almost 160 km/h, but a British test barely got above 130 km/h.

In one restoration in England the piston rings had rusted solid after standing, the fork legs were pitted and the silencers rusted through. One owner reports oil leaking from the head onto the rear tyre; that is one experience, not a known problem.

Jan Willem Boon in Ruinen (NL) sells new old stock for “Sprint, SS, SX 350 1969–74”. The American specialist Moto Italia has been sold and is temporarily not taking orders. According to Classic Bike Guide some parts are hard to get and tail-light lenses are no longer available. The international Aermacchi Club is based in the Netherlands.

Price indications:

• Classic Trader (viewed in 2026): realistic market price 350 Sprint c. £3,500–5,700.
• Aguttes (France, date unknown): a restored 1974 SS 350 with starter sold for €4,013.
• Mecum (USA, spring 2023): a 1972 SS 350 sold for $2,200.
• AM Klassiek (December 2019): a restored 1972 Sprint for sale at €6,500.