Headlight Height Adjustment--Measure How High and What Distance from Object?
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Headlight Height Adjustment--Measure How High and What Distance from Object?

This is a discussion on Headlight Height Adjustment--Measure How High and What Distance from Object? within the Yamaha FZ-09 Guides and How-To's forums, part of the Yamaha FZ-09 Garage category; I did a reply in a how-to thread, but want to post here for quick answer. My headlight is aimed to high. I have the ...

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Thread: Headlight Height Adjustment--Measure How High and What Distance from Object?

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    Senior Member Pseudo-Fed's Avatar
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    Headlight Height Adjustment--Measure How High and What Distance from Object?

    I did a reply in a how-to thread, but want to post here for quick answer.

    My headlight is aimed to high. I have the procedure from the dealer on adjustment. Can anyone tell me the process? If I sit on bike X feet on level ground from Garage door, I would adjust to Y inches at center of beam above floor. Of course Yamaha adjustment procedure doesn't give values for X and Y since I'm sure suspension, rider weight, etc. will affect.

    Can anyone tell me good values for X and Y?

    Thanks!
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    Senior Member chris1261's Avatar
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    Off the cuff, i'd say measure the height of the trunk lid on a family sedan and make it a few inches lower.
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    1979 YZ 125|1984 RZ 350|1984 RZ 350|1991 ZX6|1993 DR 350|Y2K ZRX 1100|2009 WR 250X|2013 TR 650|2014 FZ-09 |2017 FZ-10

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    Senior Member Pseudo-Fed's Avatar
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    Quote Originally Posted by chris1261 View Post
    Off the cuff, i'd say measure the height of the trunk lid on a family sedan and make it a few inches lower.
    Thanks. Assume you mean low beam. And I have a Corolla, which is pretty low, so I'm thinking right at center of that bumper….
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    Senior Member Pseudo-Fed's Avatar
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    Quote Originally Posted by Pseudo-Fed View Post
    Thanks. Assume you mean low beam. And I have a Corolla, which is pretty low, so I'm thinking right at center of that bumper….
    Any idea what distance from the garage door to do this? Elevation point of aim can be very different at 5 yards, 10 yards, etc….
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    AHR
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    Quote Originally Posted by Pseudo-Fed View Post
    Any idea what distance from the garage door to do this? Elevation point of aim can be very different at 5 yards, 10 yards, etc….
    Typically you want to adjust at a distance of 25ft. At that distance, your cutoff should not be higher than the center line of the bulb.
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    Senior Member Pseudo-Fed's Avatar
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    Quote Originally Posted by AHR View Post
    Typically you want to adjust at a distance of 25ft. At that distance, your cutoff should not be higher than the center line of the bulb.
    Thank you. But cutoff, you mean the highest point of the beam width? And by bulb, you mean the bulb height of the Corolla sedan? Sorry for all the questions. When I did this with my ST1300 a few years ago there were definite recommendations about distance from object and inches above ground for edge of beam...
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    Senior Member Pseudo-Fed's Avatar
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    Quote Originally Posted by Pseudo-Fed View Post
    Thank you. But cutoff, you mean the highest point of the beam width? And by bulb, you mean the bulb height of the Corolla sedan? Sorry for all the questions. When I did this with my ST1300 a few years ago there were definite recommendations about distance from object and inches above ground for edge of beam...
    At 25', how high should the lowest part of my low beam be?
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    AHR
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    Quote Originally Posted by Pseudo-Fed View Post
    Thank you. But cutoff, you mean the highest point of the beam width? And by bulb, you mean the bulb height of the Corolla sedan? Sorry for all the questions. When I did this with my ST1300 a few years ago there were definite recommendations about distance from object and inches above ground for edge of beam...
    Yes, the highest point where the light projects. By the bulb, I mean the bulb inside the housing. If you look really close at the front of many headlight housings, there is a small marker, usually like a cross hair, that is where you can measure from to the ground. 25ft away from there, you shouldn't be as high as the centerline to ground measurement. It should be covered in your state's inspection guidelines, look there for more accurate data. These are only suggestions.
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    Senior Member Pseudo-Fed's Avatar
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    Googled it. Tell me if this sounds right:

    1. Measure center of headlight off level ground with bike in riding position. Let's say this is 36".
    2. Place bike in riding position on level ground, 25' from flat wall, garage door, etc.
    3. Mark the wall with horizontal line at measurement from step 1, say 36" (or actual measurement).
    4. Adjust low beam so TOP, or HIGHEST point of low beam is just under line. In other words, full low beam just below line.
    5. High beam should then approximately straddle the line. In other words, the high beam should be about centered around the line.

    I got this from a diagram that described the process. Does this sound about right?
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    "Fast is Fine, but Accuracy is Final" - Wyatt Earp

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    Senior Member Pseudo-Fed's Avatar
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    Quote Originally Posted by AHR View Post
    Yes, the highest point where the light projects. By the bulb, I mean the bulb inside the housing. If you look really close at the front of many headlight housings, there is a small marker, usually like a cross hair, that is where you can measure from to the ground. 25ft away from there, you shouldn't be as high as the centerline to ground measurement. It should be covered in your state's inspection guidelines, look there for more accurate data. These are only suggestions.
    I appreciate your time.
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    Jeff

    http://www.idpa.com
    "Fast is Fine, but Accuracy is Final" - Wyatt Earp

    2019 MT-09--Ice Fluo

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