HD = Huge Dinero

 

Harley model designations are a sequence of letters and numbers, combined in limited ways. The sequences can be long, as in the 2006 model designation FLHTCUSE. The first letter may be one of the following: E, J, K ('50s small twin), F, U, V (Big Twin), D, G, R, W (Small Twin), X (Sportster), or V (VRSC) Letters are appended singly or in pairs, as follows: B (Belt Drive), C (Classic or Custom), D (Dyna Glide), DG (Disk Glide), E (Electric start), F (Fat Boy (1990-present) or Foot-shift (1972 and prior)), H (High compression), L (Hydra Glide forks), LR (Low Rider), P (Police), R (Race or Rubber-mount), S (Sport, Springer, or Standard), SB (Single belt final drive), ST (softail) T (Touring), WG (Wide Glide), I (Fuel injection), SE (Screamin’ Eagle), U (Ultra) Custom Vehicle Operations models can also have a number (2,3,4) added. Note that these conventions for model designations are broken regularly by the company.

This is from the wiki

 

you must memorize these codes or be labled a poser...the secret handshake will be shown to you by the service dept. after the 1000 mi. mandatory service [sm=deal.gif]

 

Opps sorry you said you went there. F= big engine X= sportester FX= big engine with sporter forks, all Dynas are FXD...., Some Softies are FXST the others are FLST (L being the fat forks) and there are Springers... here:

Sportsters use XL. Subsequent letters in the designation refer to model variations within the sportster range, XL followed by either 883 or 1200 and then some random letter to go with the name.

Dyna having the big-twin engine (F), small-diameter forks from Sportster = X (not really from the sporty anymore), and the Dyna chassis (D). Dyna models have designations FXD + random letters

Softails have the big-twin engine (F) and the Softail chassis (ST), some have the small-diameter forks (X) and are FXST+ random bs. Others use larger forks like the touring bikes (L) and are therefore FLST+random bs. And there are the Springers, a 21-inch wheel gets FXSTS(B), and the fat springer with the 16-inch wheels get FLSTS+C

The oldguy or "touring" bikes all use both the Big-Twin and large forks therefore they are all FL+random T= tour

V-Rods get VR+ random crap...

Hope that helped translate a little...