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Third eye blind

October 28, 2010

It was dark, I was stopped behind a shiny black van. And I could only see one light reflected.

The headlight was still illuminated, but the little extra light in the horncast was MIA. A minor annoyance, easily dealt with.

Removing the Piaggio emblem

First, remove the Piaggio emblem (Orin O'Neill photos)

The horncast is the plastic trim piece in the middle of the legshield. Removing it is easy peasey. Start by removing the Piaggio emblem.

You’ll notice there’s a notch on the right edge. The blade of a medium-size screwdriver fits perfectly. Insert and twist. If you want, you can wrap the screwdriver blade in masking tape so as to avoid scratching the surface, but careful use of the screwdriver will leave the surface unblemished.

Remove the screw

The notch-side edge will pop up; just lift it and the emblem is free. Set it aside. You’ll see a space inside the hexagon. There’s a Philips-head screw in there. Remove it and set it aside.

The screw keeps the horncast in place. Once removed, slide the horncast up about half an inch (more easily done if you turn the headset as far right as it will go).

The light is mounted in the horncast. You don’t need to remove it. You’ll notice there’s a socket in the back of the light’s reflector, which is attached to a wire that is plugged into another wire.

Connecting wire

To get at the bulb, you need to remove the socket from the reflector. You are not required to unplug the white plugs, but if it’s easier (say, it’s raining like a you-know-what and there’s an awning a few feet away), go ahead. They are designed to go back together only one way.

The socket is made of rubber, so all you have to do is squeeze it and pull. It comes out rather easily.

The burned-out bulb had a slight brownish coating on the inside, and the filament halves were making noise loud enough to hear unaided. Yep, the bulb burned out. If the bulb’s filament appears intact, the problem is not the bulb. That’s a subject for another time! 😉

158 light bulb

This particular bulb is a 158 automotive bulb, commonly used for things like turn signals and marker lights. They are readily available at any auto parts store or big-box retailer, usually in packages of two. There’s a running light inside the headlight reflector that uses the same bulb, and it’s also burned out. However, the headlight bulb is working and I just don’t feel like taking the headset apart, so I’ll replace it when the headlight burns out.

Pull the bad bulb out, and you will see a slot in the bottom of the socket. The bulb’s bottom blade fits into this slot. Just push the new bulb in as far as it will go.

At this point, you can test your work by turning the ignition key to the “on” position. If the bulb illuminates, you’re good to go. As long as the headlight and any other lights that are supposed to be on work as well.

Assembly is the reverse of disassembly. Favicon

  1. Jack Riepe permalink
    October 31, 2010 10:13 am

    Dear Orin:

    I am a firm believer in that one can never have too many lights.

    Fondest regards,
    Jack • reep • Toad
    Twisted Roads

  2. October 31, 2010 11:48 pm

    riepe is a scaredy cat. That’s according to his dog atticus.

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