Vintage Motorcycle Works

As reprinted from the Delco-Remy Service Manual dated January 1, 1933

Remy 16 Horn Adjustments:

Adjust current consumption to 4.0 - 6.5 amperes (2.5 - 4.0 amperes on 12 volt horns) by varying the position of the current adjusting screw. If ammeter is not available, adjust the horn according to sound, but if accurate results are to be attained, an accurate reading ammeter must be used. Turn adjusting screw to left to increase the current. (See Fig. 1) Increasing the current increases the volume, but too much current will cause the horn to have a sputtering sound. This adjustment is very sensitive, therefore, move adjusting screw one-tenth (1/10) turn at a time and lock in position after each change before trying the horn.

If the current adjustment remedies the performance of the horn giving it the correct tone, no further adjustment need be made. If the horn continues to have an unclear tone, remove the mounting bracket and the nuts that retain the flat plate or projector, and clear up the tone by changing the air-gap adjusting stud. This adjustment is made by loosening the lock nut and turning the stud to the right until it can be felt touching the core. When stud is in this position, the horn will not sound. Back stud away from the core and turn it to the left three-fourths (3/4) of one turn and lock in place. If the horn has a course high pitch, turn air-gap adjusting stud to the left, or if the pitch is too low, turn stud to the right. Do not move stud more than one-tenth (1/10) of a turn at a time when adjusting near correct setting. Horn can be held in hand when making the adjustment.