Motor-Runner's Helmet

 is a piece of headwear in Fallout: New Vegas.

Characteristics
It grants a +5 bonus to Melee Weapons and a +1 bonus to Perception.

Visually, it differs from the average Fiend battle helmet by the Bighorner horns, it's missing the feathers on the horns, there is a key hanging from the left horn and the symbol on the skull is different.

Locations

 * It can be taken from Motor-Runner's corpse after killing him in Vault 3.
 * Alternatively, it is given to you by Motor-Runner if you decide to tell Hsu that Motor-Runner is "dead."

You must give it to Colonel Hsu to end the associated mission, you earn NCR fame and caps but lose the helmet unless it bugs. Freeing the ranger Bryce Anders and speaking to Hsu is enough to go from "liked" status with the NCR to "idolized" (regardless of dialogue choice), so turning over the helmet is entirely optional due to numerous other ways to raise reputation.

Bugs

 * Sometimes the helmet will give a +2 perception and a +10 Melee weapons bonus.
 * Motor-Runner's Helmet will sometimes remain in the Courier's inventory even after the associated quest is completed. It is a quest item: it cannot be dropped, placed into a container or given to a companion. Note: It also weighs 1 pound.
 * Killing Motor-Runner without having been assigned to do so will cause you to fail a quest. HOWEVER, you can still give the helmet to Hsu for the quest XP (the helmet won't be removed from your inventory though the option appears to exist to drop it. Clicking the "Drop" button will not drop the helmet, and you will simply get the Quest Item error message).
 * Sometimes, in the add-on Dead Money, when this helmet is in your inventory, the game will crash when you find the 'source' of the signal, and the 'trap' is sprung.