Harley-Davidson FL

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Customized Shovelhead Electra Glide with Twin-Cam Electra Glide in background
Customized Shovelhead Electra Glide with Twin-Cam Electra Glide in background

FL is a model designation used on Harley-Davidson motorcycles from 1941 to the present. Mostly applied to Harley's large-framed bikes, including the current Touring series, the FL designation is also used with their Softail series, especially on Softails with large front forks or with traditional styling and Springer forks.

Contents

[edit] Early FLs

The FL was introduced to the Harley-Davidson model line in 1941. It used a 74 cubic inch version of the "Knucklehead" OHV engine that powered the EL in 61 cubic inch form. The FL shared its frame with the EL and with the U and UL, which used a 74 cubic inch flathead engine. The FL replaced the UH and ULH, which used the same frame with 80 cubic inch flathead engines. [1]

The FL continued relatively unchanged until 1948, when it and the EL were given redesigned "Panhead" engines of the same capacities as before. These engines had several improvements over the earlier "Knuckleheads", incuding aluminium cylinder heads to reduce weight and improve cooling and self-adjusting hydraulic lifters.[2] The U and UL flathead twins were discontinued in 1948, leaving the OHV EL and FL models as Harley-Davidson's large-frame motorcycles. [3]

[edit] Hydra-Glide

In 1949, a year after getting the "Panhead" engine, the FL was given a new front suspension and a model name to go along with it. In honour of their first production motorcycle with hydraulically-damped telescopic forks, the FL was officially called the Hydra-Glide. This name would change twice in the history of the basic large-framed FL bikes, each time signalling an improvement in the bike's technology.[2] In addition, the Glide ending would be used on other models, based on both and FL and FX formats.

In 1952, the Hydra-Glide's transmission format was reversed from hand-shift/foot-clutch to foot-shift/hand-clutch, although the original format continued to be offered as an option until 1978.[2] 1952 was also the last year of the 61 cubic inch EL, making the FL the last remaining large-frame model. [4]

A more highly-tuned engine with high-compression heads, higher-lift cams, and polished ports, was offered with the FLH version of 1955.[5] The FLH designation would continue up to the present.

[edit] Duo-Glide

The FL model was given a new frame in 1958. This frame included a rear swingarm suspended by a pair of coil-over-shock suspension units. In honour of this fully-suspended chassis, the FL's model name was changed from Hydra-Glide to Duo-Glide. [6]

Unlike OHV configuration, aluminium heads, and telescopic-fork front suspension, however, this improvement in technology was applied to the small-frame bikes first, the K-series having received rear suspension in 1952. [7]

[edit] Electra Glide

Electra Glide Ultra Classic in Bristol. This is based on the Tour Glide frame, but uses the Electra Glide fork-mounted "batwing" fairing
Electra Glide Ultra Classic in Bristol. This is based on the Tour Glide frame, but uses the Electra Glide fork-mounted "batwing" fairing

The third and final change given to the name of the basic FL model would occur in 1965, the final year of the "Panhead" engines. These last "Panheads" were the first stock Harley-Davidson engines to be equipped with electric starters. This innovation for Harley-Davidson was greeted with the new model name of Electra Glide.[2]

In 1966, the "Panhead" gave way to the "Shovelhead", gaining a ten percent increase in horsepower in the process.[8]

A fork-mounted fairing became available on Electra Glides in 1969. This became unofficially known as the "batwing" fairing. [9] Although the batwing fairing was an easily removable option on early Electra Glides, it was not removable on later machines, as the instruments were moved from the fuel tank into the fairing.

The FL frame was the basis for the 1971 FX Super Glide. The FX mated the FL frame with the forks of the XL Sportster, with buckhorn handlebars and a large fibreglass tailpiece completing the Super Glide specification. [10]

The FL was given a front disc brake in 1972. [11]

The three speed plus reverse option was discontinued in 1977. [12]

An 80 cubic inch engine was made optional on the Electra Glide in 1978. However, the FL designation was not changed as a result. [12] By 1981, the 80 cubic inch engine was the standard engine, the 74 cubic inch engine being discontinued.[13]

The low-compression FL engine was discontinued in 1979, as was the option for hand-shift/foot-clutch transmission controls.[2] [12]

[edit] Tour Glide

The FLT Tour Glide was introduced in 1979. Sold alongside the existing FLH Electra Glide, the FLT had a larger frame with rubber engine mounts, a five-speed transmission, the 80 cubic inch engine, and a frame-mounted fairing. In order that the FLT frame, which was larger and heavier than the large and heavy FLH frame, would handle acceptably, the front forks were given radical steering geometry which had them mounted behind the steering head, with the frame behind the steering head being recessed to allow adequate steering lock.[13]

The FLHT was introduced in 1983. This was an Electra Glide based on the FLT Tour Glide frame, but using the Electra Glide "batwing" fairing instead of the Tour Glide frame-mounted fairing.[13]

Except for the base FLH, all 1984 FLs were equipped with the new rubber-mounted Evolution engine and a five-speed transmission. [14]

All "Shovelhead" engines were discontinued by the 1985 model year. [15] In that year, the four-speed solid-engine-mount FLH was modified to accept rubber mounting and the Evolution engine. The FLH was discontinued in 1986; all Touring models thereafter used the FLT/FLHT frame. Ironically, the FLT Tour Glide, which introduced the current Touring frame, was dropped from the lineup in 1994. The frame-mounted Tour fairing would return with the FLTR Road Glide in 1999.[13]

The Evolution engine was replaced by the Twin Cam 88 engine on all large-frame Harley-Davidson motorcycles in 1999.[13]

[edit] Unfaired Glides - Electra Glide Sport and Road King

An unfaired version of the FLH Electra Glide, known as the FLHS Electra Glide Sport, was available from 1980 to 1982. An unfaired FLHT Electra Glide reintroduced the FLHS Electra Glide Sport name in 1987. In 1994, the FLHS Electra Glide Sport was replaced by the FLHR Road King, which continues to the present day.[13]

[edit] FL Softails

2002 FLSTC Heritage Softail Classic.
2002 FLSTC Heritage Softail Classic.
See also: Softail

Harley-Davidson introduced the Softail chassis in 1984. [16] The original Softails used the small FX telescopic forks, but the FLST Heritage Softail with large FL telescopic forks was introduced in 1986. The FLSTC Heritage Softail Classic, with large front forks and retro styling, was in production by 1988. [17]

Other Softails with big forks followed, including the 1990 introduction of the FLSTF Fat Boy and the 1993-only FLSTN "Cow Glide". [18] [19] The base FLST Heritage Special was discontinued in 1991.[13] The FLSTN was continued after 1993 without the bovine motif as the Nostalgia model until 1997, when it was replaced by the FLSTSC Springer Classic.[13] The Springer Classic is also designated as an FL despite using Springer forks instead of the large FL telescopic forks.[20]

In 2000, all Softails, including the FL models, were switched from the Evolution engine to the counterbalanced Twin Cam 88B engine specially developed for the rigid engine mounting in this frame. [13]

The FLSTN designation returned in 2006 with the Softail Deluxe. [21]

[edit] References

  1. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 95 Publications International Limited, 1997 ISBN 0-7853-2514-X
  2. ^ a b c d e Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 134-135 Publications International Limited, 1997 ISBN 0-7853-2514-X
  3. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 141 Publications International Limited, 1997 ISBN 0-7853-2514-X
  4. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 150 Publications International Limited, 1997 ISBN 0-7853-2514-X
  5. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 164 Publications International Limited, 1997 ISBN 0-7853-2514-X
  6. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 186 Publications International Limited, 1997 ISBN 0-7853-2514-X
  7. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 158 Publications International Limited, 1997 ISBN 0-7853-2514-X
  8. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 206 Publications International Limited, 1997 ISBN 0-7853-2514-X
  9. ^ The A-Z of Harley-Davidson Part Two
  10. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 234 Publications International Limited, 1997 ISBN 0-7853-2514-X
  11. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 244 Publications International Limited, 1997 ISBN 0-7853-2514-X
  12. ^ a b c Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 258 Publications International Limited, 1997 ISBN 0-7853-2514-X
  13. ^ a b c d e f g h i The A-Z of Harley-Davidson Part Three
  14. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 273 Publications International Limited, 1997 ISBN 0-7853-2514-X
  15. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 274 Publications International Limited, 1997 ISBN 0-7853-2514-X
  16. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 272 Publications International Limited, 1997 ISBN 0-7853-2514-X
  17. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 277 Publications International Limited, 1997 ISBN 0-7853-2514-X
  18. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 311 Publications International Limited, 1997 ISBN 0-7853-2514-X
  19. ^ Mitchell, D. "Harley-Davidson Chronicle - An American Original" p. 288 Publications International Limited, 1997 ISBN 0-7853-2514-X
  20. ^ 2007 Harley-Davidson Softail Springer Classic specifications
  21. ^ 2007 Harley-Davidson Softail Deluxe specifications
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