This is Gary's full-size (puppet size, anyway) V-Rod Harley Davidson motorcycle. This was seen during the scene featuring the 'Pearl Harbor Sucks' song when Gary is driving around realizing he should be back helping the Team stop Kim Jong Il. I know of at least three of these motorcycles that were used in this scene. Two of them are this size, and the third one is a smaller scale bike (and still has a small-scale Gary sitting on it). The two large ones are actually remote control motorcycles that were sold by Harley Davidson a few years ago which have been modified by the production team a little. One of them (not this one) is still an R/C bike that they added 'training wheels' to so it wouldn't fall over with the weight of the Gary puppet sitting on it (seen in wide, long shots of the bike with Gary riding down the street). The other one (this one) was mounted on a pole and fixed in position directly in front of a camera for close-ups of Gary while he was riding the bike. While watching the scene, it's pretty obvious which shots have the bike attached to a mount in front of the camera. All the R/C components have been removed, and all the lights have been re-wired to light up via external power. It's fairly large, about 26 inches long.

Note the wires added by the production, and the large metal bracket on the bottom that attached the bike to a pole.

Here's a couple of production-added parts that are unique to this particular
Motorcycle. On the handlebars, black wire-ties have been added to hold the
wires to the turn signals in place. Below the gas tank, you can see a red wire
that powers the headlight. These are not on the original toy, and don't appear
to be on the other motorcycles used in the movie.

Here's a couple more images of this motorcycle in the movie:
If you look close, you can see the wire-ties in the first image.