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Royal Enfield - SG650 Concept Motorcycle



Royal Enfield showcased a major centre-piece of their 120 anniversary celebration projects today with the unveiling of ‘Project Origin’, a faithful working replica of the brand’s very first ‘motor-bicycle’. This was the very machine that built the foundations upon which Royal Enfield has based their enduring legacy of ‘Pure Motorcycling’.

The brand's famous tagline, ‘Since 1901’ pays testament to just how important the concept of heritage and embracing the richness of the past is to Royal Enfield, and ‘Project Origin’ embodies this sentiment wholeheartedly. The year 1901 also carries considerable weight within the motorcycling world, as it consequently makes Royal Enfield the oldest motorcycle manufacturerin production to this day.

The conception of ‘Project Origin’ came about after a challenge was laid down to the Royal Enfield design and engineering teams by Gordon May, Royal Enfield’s in-house historian, during a historical presentation to celebrate the brand’s 120th anniversary. Part of the presentation focused on the very first prototype Royal Enfield motor-bicycle that was developed all theway back in 1901 by Frenchman Jules Gobiet, working hand-in-hand with Royal Enfield’s co-founder and chief designer, Bob Walker Smith. As the infant motorcycle industry was not sufficiently well established to have its own dedicated exhibition, the prototype was consequently displayed at the Stanley Cycle Show in London, in November 1901. This was the very first time any two-wheeled engine-powered Royal Enfield had ever been displayed to the public.

However to date, no working model of this original motor-bicycle had been found to exist and consequently a major piece of Royal Enfield’s historical puzzle was missing. There were no surviving design blueprints or technical drawings which gave any usable reference to how the motor-bicycle was constructed. All that remained were a few period photographs, some promotional advertisements and a couple of illustrated news articles from 1901 that gave some basic graphic clues and information as to how the motor-bicycle would have looked and might have functioned. The extent of the evidence to be guided by was slim at best, however this made the challenge being proposed to the Royal Enfield Team even more exciting - could thevery first piece of Royal Enfield’s DNA be reconstructed in celebration of such a significant anniversary?

A team of passionate Royal Enfield volunteers was swiftly assembled and set to task on a journey of discovery and exploration ,delving back through the history books to unearth as much information and century old knowledge as possible about the pioneering era of two-wheeled motorised transportation. Working collaboratively between the teams at both Royal Enfield UK and Indian technical centres, as well as with Harris Performance and other experts from within the vintage motorcycling community, the treasure hunt to find all the pieces of the design puzzle started to build momentum.

It was very clear from the outset that the mechanics, engineering and ergonomics of the original Royal Enfield motor-bicyclewas worlds apart from the motorcycles of today. One of the most obvious differences was in the mounting position of the 1 3/4hp engine, which was clamped onto the steering head above the front wheel, which in turn drove the rear wheel via a longcrossed-over rawhide belt. Gobiet hoped that powering the rear wheel would reduce the side-slip commonly associated withfront wheel driven Werner motor-bicycles. Unlike most other engines, the Royal Enfield’ crankcase was horizontally split. Thisavoided the disastrous consequences of oil dripping onto the front wheel from leaky vertically split crankcases.

A Longuemare spray carburettor was situated on the side of the petrol tank some distance lower than the level of the engine’scylinder head, a secondary feed was taken off the exhaust and passed around the carburettor mixing chamber to warm the fueland prevent icing. Lubrication was total loss, the rider squirting a charge of oil into the crankcase via a hand oil pump located onthe left side of the cylinder. This would burn off after 10 to 15 miles at which point another shot of lubricant was required. The cylinder head housed a mechanical exhaust valve and an automatic inlet valve. The inlet valve was held closed by a weak spring and opened by vacuum. As the piston travelled down the cylinder, the inlet valve was sucked open allowing a charge of air-fuelmixture in. A contact breaker assembly on the timing side axle triggered a trembler coil, which sent a rapid succession of pulsesto the spark plug. This resulted in a good burn despite running at very low revs.

Starting the machine required pedal power, and then once the engine fired, the carburettor was opened from its tickover tofull-on position by a hand lever located on the right side of the petrol tank. There was also no throttle - speed was modulated by the use of a valve lifter which was opened by a handlebar lever. To slow, the rider applied the valve-lifter. This opened the exhaust valve and as there was now no vacuum in the cylinder, the automatic inlet valve stayed shut and no air-fuel mixture entered the cylinder head. As soon as the rider closed the exhaust valve, the inlet valve opened and the engine fired. Hence, an observer might think the engine was intermittently cutting out when, instead, the rider was simply controlling his speed.

The front wheel had a band brake that was applied by a Bowden lever and cable arrangement operated by the rider’s left hand. The rear wheel also had a band brake but this was operated by back pedalling. The saddle was a leather Lycette La Grande and the 26” wheels were shod with Clipper 2 x 2” tyres. It cost exactly £50 which is the equivalent of £4000 / 4,745 Euros in today’s money.

With all this background information gathered it was then a case of the ‘Project Origin’ team combining new-world technologies with old-world skills and practices to start the full reconstruction of a faithful working replica from the ground up. As the buildtook form it was quickly apparent as to the level of craftsmanship and expertise that were required to manufacture certain component parts of the motor-bicycle. One of the most complex and intricate elements lay in the construction of the folded brass tank, which was masterfully handcrafted from a single sheet of brass - folded, shaped, hammered and soldered using age-old tools and techniques now almost forgotten to modern manufacturing.

The tubular frame of the motor-bicycle was expertly brass-braised by the team at Harris Performance as well as a number of hand machined brass levers and switches. The engine was completely built from scratch, and with no reference blueprints or technical diagrams to refer to the team was required to intricately study the few photographs and illustrations available from 1901 in order to develop CAD designs for each component part which were then either individually hand-cast or machined from solid.

In addition, the team hand turned the wooden handles, manufactured the front and back band brakes, and had the carburettor built from scratch. The turn of the century period original parts that were sourced; the paraffin lamp, the horn, the leather saddle, the wheels - were all reconditioned and nickel plated to give the impression that the finished ‘Project Origin’ motor-bicycle had just been unveiled to the public for the very first time at the 1901 Stanley Cycle Show, as would have been the case 120 years ago to the month.

‘Project Origin’ represents yet another seminal chapter in Royal Enfield’s illustrious story; marked by decades of creativity, development, ingenuity and resilience. What started way back in 1901, with that charming, slow-revving, doof - doof - doof engine of the very first motor-bicycle, set the foundations for what would become an extraordinary and ongoing 120 year adventure.

At EICMA 2021, motorcycle enthusiasts will be able to join Royal Enfield on an epic historical journey, ‘Royal Enfield Through The Ages’ as the brand brings to life 120 years of rich and prestigious heritage, as told through the individual stories of some of their most iconic motorcycles representing every decade of their existence.