Rivera Primo Brute IV Extreme for 1990-05 Dyna Models - Manual (Page 8)

1-1/4-20 Bolt
2-10-32 Bolt
3-lock tab
4-thrust washer
5-pinion gear
6-spring
7-extension shaft
8-coupler
PRO CLUTCH ADJUSTMENT
BRUTE IV EXTREME CLUTCH PACK HEIGHT= 1.410” - 1.430”
As delivered the Pro-Clutch clutch-pack requires no adjustment, the clutch pack height having been set at the factory. After
thePro-Clutch has accumulated significant mileage, it may require some adjustment due to normal wear. Use the procedures
out¬lined below if & when adjustment is required. For best all around performance the diaphragm spring should be com-
pressed to with¬in .010” of being flat when the shouldered spring retainer nuts have been properly tightened (bottomed)! This
provides best leveraction at the handlebar, & normal spring pressure to the clutch pack. Slightly more clutch pressure can be
gained with the diaphragm spring with .030” of spring height (outward bow), but this increases slightly the hand effort needed
for the clutch. This spring con¬figuration can be obtained by placing a small diameter washer on each of the clutch hub
studs, as shown in photo B! Three clutch spring strengths are available: A stock equivalent spring (black in color), a medium
spring for street performance applications (silver in color), & a competition spring (gold in color) recommended for drag race
only applications.
If the diaphragm spring adjustment requires a small
amount of more spring compression, this can be ac-
complished by using one or more of the special .020”
washers on each odf the shouldered nuts (Photo A)
If the diaphragm spring adjustment requires lessf spring
compression, this can be accomplished by using one or
more of the special .030” washers on on top of the clutch
hub stud nuts reducing spring compression. (Photo B)
PHOTO A
Photo C shows a diaphragm spring that is compressed
too far, & needs adjustment. Correct adjustment will re-
quire that special adjustment washers be added to the
clutch hub studs as shown in photo B.
PHOTO B
The diaphragm spring will be compressed to within .010”-to-.020” of flat when correctly installed & adjusted
This is a diaphragm spring correctly adjusted. Daylight is
showing at either edge, because the spring is within .010”
of being flat! (Slightly bowed outward) as seen in photo D.
PHOTO C PHOTO D
12450 WHITTIER BLVD. WHITTIER, CA 90602
TEL: 562-907-2600 FAX: 562-907-2606
Orders: 562-907-2600
www.riveraprimoinc.com