Rivera Primo Brute IV User Manual

Page 2

STEP 1:

Begin by disconnecting battery cables. Removing all the OEM
primary-drive components including the inner primary cover,
AND THE FACTORY INNER-BEARING RACE ON THE TRANS-
MISSION MAIN SHAFT! Check the motor shaft & transmission
main shaft for leaky seals. Check & thoroughly clean the motor
drive shaft & trans main shaft. Check & tighten the shift-lever
as needed at this time!
If you wish to change the final drive
ratio, now is the time to install a rear
belt drive transmission pulley (tighten
nut perprocedure outlined in HD facto-
ry service manual). Primo’s billet aluminum rear drive pulley is
available with 29, 30, 32, or 34 teeth & weighs 3 pounds less
than the OEM unit.

STEP 2:

Install the starter coupler onto the end of the starter
motor as shown. This component must be installed
prior to the installation of the bearing support.

1986-1988 Softail / FXR applications:

Adequate clearance for the coupler must be made. Remove

approximately .150” of material in the area indicated by the X

(use the 7 o’clock position as your guide).

A 1990 or later starter motor is required. The Primo Belt

Drives adapter plate (PP-407H) is mounted between the

starter motor and the transmission starter boss as pictured.

1970-78 Shovelhead applications (ratchet top only).

A 1990 & later starter motor is required for Shovelheads. A

Primo Belt Drives adapter plate (PP-306) is mounted between

the starter motor & the transmission starter similar to the Softail

adapter.

STEP 3:

Install the bearing support (rear motor plate section PP-304,
PP-404, PP-504, or PP-604). Carefully align the bolt-holes
and install the bearing support over the starter extender. Only
hand tighten the bolts at this time. Attach the 1990 or later
starter motor to the rear of the bearing support (1986 Softails
require an adapter PP-407-I) (1970-78 Shovelhead with
ratchet top requires the starter adapter PP-306).