The brackets installations are identical for all models, all years of the Honda ST1100/ST1300
These instructions good forST1100 and ST1300 although part numbers are different.


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ST1300  Mirror Housing Cutout Template

ST1300 Left Side Template
ST1300 Right Side Template

 

LEFT mirror housing, viewed from above. Left and right templates are mirror images of each other.

A = 6  3/8"

B = 6  5/16"

C = 1  5/16"

D = 1 3/16"

E = 3/4"

While the above dimensions are as accurate as possible, nothing substitutes good common sense when it comes to cutting into your bike. Install the PIAA brackets FIRST, then compare how the templates line up with the installed bracket BEFORE you start cutting! Then, check it again.

You get ONE OPPORTUNITY to cut the mirror housing correctly, so TAKE IT SLOW!!! Hurry the job, and you greatly increase the chances of dorking it up. The mirror housing is one very expensive piece of plastic to replace, so take a slow and methodical approach! 


You can clearly see the red rectangular area that is to be cut out.
ENSURE that you carefully and methodically check and re-check the position of the template BEFORE you start cutting!!



A very fine (32 teeth/inch) hacksaw slowly cutting one side of the rectangle.
Use a very sharp machinist's scribe to score the remaining side (it will take many strokes) until it cleanly "snaps" off with pliers.

USE CARE, GO SLOWLY, USE PATIENCE!!!

 

An Alternative to Cutting the template.

To make the cutouts on the mirror housing to accept the newly installed brackets, here is what I did:

Remove the mirror cover completely. Install the brackets to the mirror bottom bolt hole using the long bolt only & snug up. Mark a black line onto the red fairing on either side of the brackets. Remove the brackets & re-install the mirror cover and then transfer the marks to the bottom of the cover. Use a little judgement about the angle and depth.

Because I have the equipment I used my grinding wheel, on which I had just installed brand new 1" wide wheels and the job went very quickly and smoothly as I was able to grind a little; Check. Grind some more; Check. Etc., until I had it right.

(And you want to be careful to just grind a little at a time. The grinding wheel will eat quickly at the plastic and if you're not careful, you could over do the depth, so discipline is the way to go: grind a small amount & check, etc.)

I then smoothed the edges with a fine file, removed all ink marks with alcohol and re-installed everything. Of course at this point, you will want to install the lights to the brackets and do the aiming procedure before permanently installing everything.

- Dick Seng, STOC #631 


With the bike up on its centerstand, you mark off exactly 15 feet from PIAA lens to a vertical wall. Now use a heavy black felt tip pen to draw a straight, horizontal line on this wall exactly 25.5" high off the floor.



When the PIAA lights strike this wall, the beams will have an oval-shaped pattern as shown above. Adjust the PIAA lamps (vertically) such that the horizontal line runs exactly through the center of the ovals. Tighted the PIAA lamps in place and GO RIDE!