The Small Engine Shop

Motorcycles => American V-Twin Motorcycles. => Topic started by: smallengineshop on November 28, 2014, 01:34:36 AM

Title: Abbreviations Used For Harley Davidson Big Twin Motorcycles from 1936 and Later
Post by: smallengineshop on November 28, 2014, 01:34:36 AM
The current abbreviation scheme used for Harley Davidson motorcycles began in 1936 with the Knucklehead engine. The first Knucklehead engine had a displacement of 61 cubic inches, and was assigned the letter 'E'. The Knucklehead engine displacement was later increased to 74 cubic inches, and this larger engine was assigned the letter 'F'. For some reason the letter 'F' has never changed, and has been assigned to all big twin Harley Davidson engines since than. Most Harley Davidson Sportster motorcycles have the first two letters XL in their abbreviation. Keep the following rules in mind when trying to understand Harley Davidson abbreviations:


Remember that there are exceptions to the above rules, but 99% of the time they will be correct.


Early Harley Davidson Models



Harley Davidson Sportster Models



Harley Davidson Softail Models:



Early Harley Davidson FX Models Without Rubber Mounted Engine:



Early Harley Davidson FX Models With Rubber Mounted Engine:



Harley Davidson Dyna Models:



Harley Davidson FLT Models:



Harley Davidson FLH Models:


Harley Davidson V-Rod Models:



Harley Davidson Trike Models:



Reference:
American Glory 110 Years Of Harley Davidson History, American Iron Special 2013
Title: Re: Abbreviations Used For Harley Davidson Big Twin Motorcycles from 1936 and Later
Post by: smallengineshop on October 01, 2015, 05:25:28 PM
Harley Davidson abbreviations don't always follow a pattern. For example, the abbreviation for the standand Road King is FLHR, and FLHT for the standard Electra Glide. The abbreviation for the Electra Glide police version is FLHTP. That makes since because the letter 'P' is added to the standard abbreviation to represent the police version. However, the abbreviation for the Road King police version is FLHP.  Why doesn't the Road King police version have an abbreviation of FLHRP?