| Atmospheric Inlet Valve - The falling of the pistons | | | | commonly found on post 1980 models of the |
| activates the opening of inlet valves by causing a | | | | big-twins and Sportsters. |
| vacuum. Usually found in the early single cylinder | | | | F-Head® - Pertains to inlet over exhaust valve |
| Harleys. | | | | engines. |
| Ape Hangers - Elevated handlebars raising the rider's | | | | Fathead® - A Twin-Cam engine introduced from |
| hands above the shoulders. | | | | 1999 and is still featured till this day! |
| Buell - First built by Eric Buell, a former | | | | Fat Boy® - The bike seen in the movie |
| Harley-Davidson employee, these are the v-twin | | | | Terminator. Characterised by a solid front disc wheel |
| Harley-engined bikes which helped the company win a | | | | and engine mounted gauges. One of |
| share in the sports bike market. | | | | Harley-Davidson's top selling motorcycles. |
| Big-Twin - A designation used for the larger sized | | | | Flathead® - An older engine featuring side valves. |
| Harley-Davidson engines. Sportster® models | | | | Noted for its durability. |
| range from 883 ( see the XL883 Sportster® | | | | Hardtail® - Basically, a frame with no suspension. |
| here ) to the 1200 cubic centimetres. Almost all other | | | | A rigid! |
| Harleys have 1340, 1450, or 1584 cc engines. | | | | Hydra Glide® - An hydraulic suspension system |
| Bobber - All extras and non-essentials are removed | | | | used in the front forks. |
| to increase the power to weight ratio. Increased | | | | Knucklehead® - A v-twin engine built from 1936 - |
| performance and better styling was the result. | | | | 1947. |
| Probably one of the first customised motorcycles | | | | Low Rider® - A custom with low riding position |
| from about in the early 50's. The first customs came | | | | and low seat. A typical custom version of the Super |
| about with the return of war vets looking to rekindle | | | | Glide® which appeared in the 1970's. |
| the thrill of flying fighter planes. Also known as a | | | | Panhead® - The series of engines that replaced |
| Bobtail. | | | | the Nucklehead. |
| Blockhead - Harley-Davidson's innovative | | | | Shovelhead® - The series of engines that |
| Evolution® V-Twin engine. | | | | replaced the Panhead from 1966 onwards. |
| Chopper - 1960's and 70's era custom bikes. Noted | | | | Side Valve - An engine with valves on the side of the |
| for extended and raked forks, tweaking done to the | | | | cylinder. |
| suspension and the introduction of thinner Japanese | | | | Softail® - Resembling the look of a Hardtail, the |
| wheels for the front end. | | | | suspension is hidden underneath the engine. |
| Duo-Glide® - A big twin with rear suspension | | | | Sportster - An improved model featuring 883 cc to |
| introduced from 1958 to the mid sixties. | | | | 1200 cc engines. |
| Dyna Glide® - The term glide refer to the effect | | | | Springer® - A model with a front fork featuring |
| of the effective rubber engine mountings used on | | | | springs on the suspension. Here's an example of a |
| the frames of this model. | | | | custom Springer. |
| Electra Glide® - An electric starter was introduced | | | | Super Glide® - A hybrid between the Sportster |
| to this model | | | | front end and the frame of the big-twin engine |
| Evolution® - The engine that replaced the | | | | Harley-Davidson's. The first factory custom ever |
| Shovelhead. Featuring an overhead valve and is | | | | made. |