FN Four

The motorcycle was originally single-speed. In 1909, a two-speed transmission was offered,Offered in 1909 in the United States, see Cycle and Automobile Trade Journal 1909, p. 188 then three-speed in 1914 with the 748 cc engine. It had a single-speed shaft drive turned by a bevel gear. The rider started the engine by pedaling bicycle style pedals with a chain drive and sprockets to the rear wheels. The 1905 model had a high-tension Bosch magneto ignition,{{rp|43}} a spray carburetor, and a rear coaster brake operated by the pedals. It had a 5:1 reduction ratio to 26-inch wheels.

By 1908, it had a two speed transmission with a plate clutch, overcoming the speed limitations of the earlier model. In 1909 a rear drum brake was fitted. In 1910 the engine was redesigned and enlarged to {{Convert|498|cc|cuin|abbr=on}}, the carburetor was moved and a new oiling system was used. The weight in 1910 was {{Convert|165|lbs|abbr=on}}.

For the US market, the 1908 model was upgraded and released as a 1908{{1/2}} model, called the F.N. Big Four.The Horseless Age. 1908. Engine power was raised from {{Convert|4+1/2|hp|abbr=on}} to {{convert|5|hp|abbr=on}}, the frame size was reduced from {{Convert|22|to|20|in}} allowing the rider to sit with both feet on the ground, the wheel rims were made heavier and would fit American tire sizes, and it came with tires with a heavier tread.

The 1911 model weighed {{Convert|185|lbs|abbr=on}} and had a wheelbase of {{Convert|56|in|abbr=on}}.Motorcycle Illustrated January 12, 1911{{rp|43}} The US model had either Goodrich or another imported brand of tires, and a leather seat made by the Mesinger Bicycle Saddle Company of New York.{{rp|43}} By 1911 bore × stroke was up to {{Convert|2+1/16|×|2+1/16|in|abbr=on}} and nominal output was up to {{Convert|6|hp|abbr=on}}.{{rp|20}}

The motorcycle had bicycle-style pedals used for starting until 1913, when a kickstarter was adopted.Duckworth 2012, p. 26

File:F.N. four-cylinder motorcycle engine.jpg

File:FN Four sectional elevation.gif

File:FN Four engine end section.gif

The FN Four's engine was designed by Paul Kelecom, who had designed single-cylinder engines prior to the FN.Kevin Cameron at Krens 1998, p. 109 The air-cooled longitudinal layout was prone to overheating the rear cylinders, a trait overcome in later designs with water cooling and transverse layout.Cameron 2012

FN originally fitted the Four with a 350 cc or 362 cc engine. The displacement increased over time, to 410 cc in 1906,Mitchell 1998 later to 498 cc for the US market, and a 748 cc variant was produced in 1914. The engine had to be periodically oiled with a hand pump during riding. The intake valves were atmospheric, pushed open by ambient air pressure against light springs during the piston's intake stroke, up to the 1914 748 cc model, which replaced the automatic inlet valves with mechanically actuated side valves.

{{centered pull quote|[A]lthough there were four-cylinder motorcycles prior to the FN, none came near matching the eminently successful and practical performance of the FN right from the beginning.|author=T.A. Hodgdon|source=Motorcycling's Golden Age of the Fours, 1976}}

The FN Four was the first production inline-four, but not the first motorcycle with a four-cylinder engine. It was preceded by a boxer 4 manufactured in 1897 by Henry Capel Lofft Holden,Walker 2006, p. 28Hodgdon 1976, p. 26 and an obscure air-cooled inline-four developed in 1903 by C. Binks of Nottingham, England, but never produced commercially. A longitudinally mounted four-cylinder "model CCCC" prototype was created by Laurin & Klement and shown in Paris in 1904, but it was essentially four ganged single-cylinder engines with four separate crankshafts, not an inline-four in the modern sense.d'Orléans 2013Malanik 2008Kirchberger and Ludewig 2007, p. 39 states "Die L&K Viercylinder-maschine CCCC war von 1904 bis 1909 in angebot" (in production from 1904 until 1909).Walker 2006, p. 28 states that production did not start until 1905 The FN, at the time of its introduction, was the only four-cylinder motorcycle for sale in America.Hodgdon 1976, p. 20 (later Henderson Motorcycle sold a four from 1912 until 1931.)

• Henderson Four
• Indian Four
• Pierce Four
• Wilkinson TMC

The success of the FN Four directly led the US Pierce Four to use the same engine mounted longitudinally with a shaft drive. Pierce-Arrow's Percy Pierce brought a 1908 FN Four home from Europe to disassemble and study.de Cet (2002, p. 360) states that Pierce "did not copy" the FN Four but "its influence...was apparent". Indian, Henderson and Cleveland fours were all said to have been inspired by the FN Four.de Cet 2002, p. 159

Early examples of the machine are rare; a 1904/1905 model, reported to be the earliest known example, sold at a record price in a 2006 auction for over US$100,000.Roadracing World 2006

A FN Four took third place in the 1908 Isle of Man TT,IOM Times 1908 and was the first four-cylinder-engine vehicle entered at the Isle of Man TT.d'Orléans 2008 In 1908 another FN Four took the gold medal in a Motor Cycling Club endurance race on the {{convert|1400|km|adj=on}} London–Edinburgh–London course.Walker 2000, p. 32

File:FN Four.jpg

An FN Four was exhibited at the Guggenheim Museum's The Art of the Motorcycle exhibition in New York and Las Vegas. Models are in the permanent collections of Petersen Automotive Museum in Los Angeles,Petersen Seal Cove Auto Museum in Seal Cove, Maine,{{citation|title=1912 Fabrique National Motorcycle|url=http://www.sealcoveautomuseum.org/collection/vehicle_list.php?vehicle=11|publisher=Seal Cove Auto Museum|location=Seal Cove, Maine|access-date=2013-10-20|archive-url=https://web.archive.org/web/20141229093448/http://www.sealcoveautomuseum.org/collection/vehicle_list.php?vehicle=11|archive-date=2014-12-29|url-status=dead}} the Musée de la moto et du vélo in Amnéville France,{{citation|title=A visit to the Motorcycle and Bicycle Museum Amneville|work=Ed Youngblood's Motohistory|author=Ralf Kruger|date=September 26, 2011|publisher=Ed Youngblood|url=http://www.motohistory.net/news2011/news-sept11.html|access-date=2013-10-20}} and others.

• List of motorcycles of the 1910s
• List of motorcycles of 1900 to 1909

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• {{Commons category inline|FN Four}}
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Category:Motorcycles of Belgium

Category:Motorcycles introduced in the 1900s

Category:Vehicles introduced in 1905