The Gas Gas EC F is the four-stroke branch of the Spanish firm’s enduro range. It was launched in 2003 as the EC FSE, was later renamed FSR and finally EC F, and shared its bodywork language with the two-stroke EC. Its capacities were 400 and 450 cc at first, with a 250 cc model added later.
Gas Gas EC F at a glance
| Maker | Gas Gas, Salt, Girona, Spain |
|---|---|
| Also called | FSE, FSR, EC F |
| Production | from 2003 |
| Type | four-stroke enduro motorcycle |
| Capacities | 400 (2003–2005), 450 (2003–2010), 250 (from 2011) |
| Engine | single-cylinder four-stroke, fuel injected |
| 250 engine from 2011 | Yamaha five-valve unit |
| Relationship | four-stroke sister of the two-stroke EC |
| Bodywork | similar to the EC, with its own radiator shrouds and rear number plates |
Model details come mainly from one source, the Italian Wikipedia article on the EC F; the English article on Gas Gas supplies the company context. based on one source.
History of the Gas Gas EC F
From FSE to FSR
The four-stroke enduro model arrived in 2003 as the EC FSE, alongside the long-running two-stroke EC. When it was renamed FSR it received a new look: the angular bodywork was simplified, with single-slot radiator shrouds, a front mudguard without the central bridge and redesigned rear number plates. Mechanically the FSR had a new kickstart lever, an engine with a different stroke and a straighter exhaust.
Four-stroke capacities
The range started with the 400, built from 2003 to 2005, and the 450, built from 2003 to 2010. These were fuel-injected four-stroke singles, visually close to the two-stroke EC models. The same period saw Gas Gas standardise colours across its range: red for 2007–2009, then black with red and white accents for the standard EC models from 2010, with white Six Days and Racing editions.
A 250 with a Yamaha engine
From 2011 the line was reduced to a single model, the 250, using a five-valve Yamaha engine. By then the EC F had become the EC F in name as well, the FSR badge being dropped.
The end of Gas Gas as an independent firm
Gas Gas became insolvent in 2015. KTM, part of Bajaj Auto, bought a significant stake in 2019, and in 2020 Rieju acquired the Gas Gas off-road platform and continued the enduro models under the Rieju MR name. The four-stroke EC F was not carried over in that form.
Design and features
- Four-stroke alternative: a fuel-injected four-stroke line beside the two-stroke EC, sharing its enduro layout.
- Distinctive FSR bodywork: simplified angular panels, single-slot radiator shrouds and a front mudguard without the central bridge.
- Engine changes: a different stroke and a straighter exhaust distinguished the FSR from the earlier FSE.
- Yamaha-powered 250: from 2011 the only EC F was the 250 with a five-valve Yamaha engine.
Gas Gas EC F versions
- EC FSE: the original 2003 four-stroke enduro.
- FSR 400: built 2003–2005.
- FSR 450: built 2003–2010.
- EC F 250: from 2011, with a five-valve Yamaha engine.
The two-stroke line is described on the Gas Gas EC page, and the trials models on the Gas Gas TXT page. More machines are in the Gas Gas collection.
Video: Popguns Review – Gas Gas FSR 450
Video on YouTube.
Sources
- Gas Gas EC F, Italian Wikipedia: FSE/FSR changes, capacities, Yamaha engine
- GasGas, English Wikipedia: FSE and FSR as fuel-injected four-strokes, company history
