I got one of the Hikari bulbs installed tonight. Removing the top fuel tank trim piece gave a little more access to the area, making installation easier. The Hikari bulbs, like many others, have a removable mounting collar. Installing just this part makes reinstalling the retaining clip very easy. One word of caution- be very careful not to drop the collar inside the headlamp housing while installing/removing it. I would imagine you would then be forced to remove the entire headlamp housing assembly to get it out. I was careful and did not drop it, but I can see that happening easily.
Once the collar is installed, it's easy to push the bulb in place, especially with that fuel tank trim piece out of the way. You can turn the bulb left/right to get it aligned for the proper pattern. It doesn't take a lot of effort to turn it, so hopefully it will not turn on its own from the vibration and shock of riding.
The white light of the LED looks so much better than the yellow halogens. I'm looking forward to a night ride to see how well they work. With the stock halogen bulbs, I was barely able to tell a difference when they were on vs off at night.
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