Lambretta Special X
|Production||150 - October 1966-January 1969 200 - January 1966-January 1969|
|Engine||148cc, two-stroke, single cylinder 198cc, two-stroke, single cylinder|
|Bore / stroke||150 - 62 x 58mm 200 - 66 x 58mm|
|Top speed||150 - 56 mph (90 km/h) 200 - 66 mph (106 km/h)|
|Power||150 - 9.38 hp (7 kW; 10 PS) 200 - 11 hp (8 kW; 11 PS)|
|Transmission||4 Speed, Handlebar Twist Grip, Chain Drive|
|Suspension||Front - Telescopic Forks Rear - Shock Absorber|
|Brakes||150 - Front and Rear Drums 200 - Front Disc Rear Drum|
|Weight||150 - 120 kg (265 lb)
200 - 123 kg (271 lb) (dry)|
|Fuel capacity||8.3 L (1.8 imp gal; 2.2 US gal)|
|Fuel consumption||150 - 93 mpg‑imp (3.0 L/100 km; 77 mpg‑US) 200 - 93 mpg‑imp (3.0 L/100 km; 77 mpg‑US)|
The project Special X was an attempt have a model more of a quality look the Lambretta had been known for. The models slogan was 'SX Appeal' and came in two variants SX150 and SX200 replacing the Li Special 150 and TV200 respectively with the Li Special 125 staying in production while the TV175 ended production. They came on the market at prices between 184,000 and 219,000 Italian lira. The SX150 was reviled to media on the 26th November 1966 by the Innocenti workshop in Lambrate, Milan. The SX200 was a favoured by scooter racers due to its increased speed and better handling, may SX200's ended up in the United Kingdom due to the 1960's racing scene.  Today the SX200 is one of the most desirable models of Lambretta, along with the TV200, GP/DL200, and GP/DL200 Electronic, due to its high build quality and rarity.
The SX150 had a total Italian production of 31,328 while the SX200 had 20,783.
The SX150 was a revamp of the Li Special 150 the changes were that the paintwork was no longer metallic, a chrome horn casting grill and a chrome flash were added on the horn casting and front mudguard respectively. The bike kept the Li Special body work with the octagonal headset and squared off front mudguard as well as the side panels with the two rear 'finger flashes'. The engine and gear ratios was modified to gain more speed over the Li150 Special by modifying the ports, this gave the bike 9.38hp and a top speed of 56mph. 
In early 1968 the badge on the horn casting was changed to a rectangle one, the front forks had press in bump stops and the glove box was changed to grey plastic.
The SX200 had new side panels with a single larger more pointed 'arrow' flash. It came with a front disc brake and dampers as standard. The engine was more heavily modified for the SX200 over the TV200 reaching 11hp.
As with the SX150 in early 1968 the badge on the horn casting was changed to a rectangle one, the front forks had press in bump stops and the glove box was changed to grey plastic.
As with the SX150 in late 1968 panel handles were changed the GP/DL style clips, but the SX200 also gained a polished horn grill and the chrome flash like the SX150 model.
The SX150 came in Spring Grey or Apple Green and the final batch came in White Thorn and internal bodywork was sprayed New White. In foreign markets side panel colours came in Red and Blue. The SX200 only came in New White when it was first released and then White Thorn for the final batch, dampers were sprayed Fiat 690 Metallic Grey. In foreign markets side panel colours came in Red,Blue, Green, Gold, Purple and Black. Seats for the SX150 were black while the SX200 came with a red seat. in foreign markets such as the United Kingdom seats came in other colours like Green, Dark Blue and Light Blue. 
Serveta Jet 200
Spanish Company Serveta gained the rights to produce a copy of the SX200 under license at there factory, with the first models being produced in 1966. These Spanish made Lambretta's were of high quality, specially designed for the local market and using a lot of locally sourced parts. Early Jet 200's were exact copies of the Italian made equivalent apart from Li styled horn casting and mudguard. The early models wore a 'Special X200' badge and SX200 panels. Later models had a 'Jet 200' badge under the 'Lambretta' badge on the leg shields and would later drop the disc brake, probably around the time Innocenti Lambretta folded as they were most likely factory supplied items.  Later models moved the air filter into the toolbox with the door being louvred, they also featured stalk indicators, an ignition switch located behind the seat, warning lights on the speedometer and GP/DL styled stripes on the side panels. Production of Jet 200's stopped around 1984 with the Jet Series 80 200.
- Lambretta Model Guide – SX Facts
- "Lambretta Official". Lambretta.
- "Lambretta Club of Great Britain". iLambretta.
- Tessera, Vittorio. Innocenti Lambretta: The Definitive History with restoration guide. pp. 129, 134–138.
- "LCGB Production figures" (PDF). Lambretta Club of Great Britain.
- Round, Martin 'Sticky'. The Complete Spanner's Manual: Lambretta Scooters Second Edition. p. 12.
- "Serveta Jet 200". Lambretta.net.
- "LCGB Spanish Lambretta". Lambretta Club of Great Britain.
- "Scootering Jet 200". Scootering.
- "British Lambretta Archive Spanish". British Lambretta Archive.