Rivera Primo Primo Brute II User Manual

T

hank you for buying a Primo Belt Drive! The new Brute Classic or Brute II Classic
belt drive system is intended for use with pre-Evo Big-Twin motorcycles (1936-to-

1984) using a 4-speed transmission. These 1 ½” belt systems will install inside all
pre-Evolution OEM aluminum or tin primary cover assemblies maintaining the stock
external appearance. The Brute II Classic utilizes a belt idler for tensioning, the Brute
Classic does not. Included in the kit is Rivera Engineering’s diaphragm spring operat­ed ”Pro Clutch” suitable for stock, street performance or competition applications. All
Alto clutch plates as utilized in Primo Belt Drives, and Rivera Pro-Clutch kits come with
a Lifetime (limited) Warranty.

installation instructions for the

Primo Brute Classic &
Primo Brute II Classic

BELT DRIVE KITS

ATTENTION INSTALLER...

Prior to starting the following installation procedure make sure the motorcycle is secured properly, and that the
battery is disconnected to prevent accidental start-up. Also please read and familiarize yourself with the instruc­tions. Use only the correct tools for a safe, long-lasting installation.

88

mmmm ((nnoo iiddlleerr))

1111

mmmm ((wwiitthh iiddlleerr))

Brute Classic

8mm Belt

Brute II Classic

11mm Belt

™

BruteClassic 8 27 04.qxd

Remove all OEM drive train components and thoroughly clean the
inner primary. Inspect the inner primary for cracks or other damage.
The serrated plate must remain in place if you are installing the 11
mm Brute II Classic (as shown). It may be removed if you are
installing the 8mm Brute Classic.

Install the KEY in the KEYWAY ensuring that it is correctly seated
and oriented so that the clutch hub will slide into place on the trans­mission main shaft. If you cannot seat the key correctly, check for
burrs on the key or keyway, deburr as needed and reinstall.

Install the clutch hub / rear basket assembly on the main shaft, and
the front pulley on the motor shaft. Hand tighten the nut on the main
shaft. Hold a straight edge firmly against the inner surface of the ring
gear as shown. The outer edge of the front pulley must line up with
the inner surface of the ring gear as shown before proceeding.
Spacers can be inserted or removed behind the front pulley to
achieve correct pulley alignment.

After correct pulley alignment is established, install the belt on the
pulleys, slide the pulleys into place taking care that the KEY is cor­rectly seated in the KEY WAY (rear pulley-hub assembly). Place a
dab of Rivera’s thread lock (blue) on the threads of the clutch hub nut
prior to permanently installing the nut. Tighten the clutch hub nut
using a high-quality torque wrench & the factory torque specifications
for your particular motorcycle. Repeat the procedure for the motor
shaft nut.

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12532 Lambert Road, Whittier, CA 90606 [phone] FAX [phone])