Check your beam is on the level
With the bike upright and with someone sitting on it, measure from the ground to the centre of the bulb. Mark this measurement on your garage door. This is the Horizontal Zero Percent Line (HZPL).
Check the vertical
Cross the HZPL line with the Vertical Zero Percent Line ( VZPL) – it needs to be 300mm above the HZPL. This is how you measure the ‘kick-up’ from the lefthand side of the beam on a UK bike.
Roll the bike back
Measure 3.81m from the door and mark the spot. Then, while keeping in line with the VZPL, wheel the bike back to your mark. The higher kick-up beam should be at least 10cm to the left of the VZPL.
Check the dip
If your bulb is less than 850mm from the ground, the top edge of the dipped beam should be 20-80mm below the HZPL. If the bulb is above 850mm the edge should be 50-110mm below the HZPL.