Rivera Primo Brute Force - Manual (Page 2)

IMPORTANT !
** Prior to starting this installation, disconnect and remove the battery. Secure the motorcycle so it will not fall and so you
have complete unobstructed access to the primary drive side of the motorcycle.
** Use blue threadlock on all bolt threads except starter jackshaft, & clutch hub studs.
** Use anti-seize on the clutch hub studs, and rear pulley bearing support shaft hubcap.
** Remove all ORIGINAL PRIMARY DRIVE components including inner & outer primary covers. Remove the factory
INNER PRIMARY BEARING RACE on the transmission main shaft. Check the sprocket shaft and the transmission
main shaft for leaky seals and replace the seals as needed at this time
STEP 1 :
Install the double ended starter extension into the starter.
Do this prior to installing the rear motor plate section.
Just the extension portion, not the complete
jackshaft assembly.
STEP 2 :
Install the rear motor plate section on the transmission using the supplied FOUR 5/16”-18 X 1 1/4” bolts. Do not tighten
the bolts completely at this time. The sealed bearing in the motor plate is a slip-fit on the transmission main shaft.
STEP 3 :
Install the front motor plate section using the two 5/16”-18X 1 1/4” inch bolts front, and two 5/16”-18 X 1 1/2” rear. Start the
5/16”-18 X 1 1/4” center bolts w 5/16” washers, and motor plate to engine case bolts initially. Ensure that the motor plates
are properly seated and aligned. Tighten all bolts equally . . . TORQUE TO 29 FOOT POUNDS.
STEP 4 :
Install the starter jackshaft assembly (with pinion gear) after
installation of the rear motor plate. Be sure to seat the thrust
washer in the groove and bend the lock tab over against the
bolt head.
STEP 4A :
Install the rear pulley (clutch basket) and hand tighten the clutch hub nut making sure it is snug. Note that this
nut is left-hand thread. At this time it is important to check the air gap between the back side of the starter ring
gear and the pinion gear. Recommended gap should be .075” to .125”. Use an 1/8” Allen wrench to measure the gap.
Just slip the short end of the wrench between the ring gear & the pinion gear. If it fits, great. If there is too much gap,
the jackshaft assembly should be shimmed to reduce the gap to the spec above (order #1185-0500 shim kit).
Air gap between ring gear
and pinion gear
Measuring the air gap
2