520
Primo Belt Drive
8MM Open
Open primary for 74" & 80" 8mm. These units were
designed for competitive use or big inch street motors.
Note: All 2" and 3" belt drive units fit adjustable
transmission bikes only.
VT No. Fits
Width Replacement Belt
8MM Kickstart
Open Or Closed Primary. Kick start only (8mm) 1½" belt
type.
VT No. Fits
Replacement Belt
Note: All belts by Primo, Karata and BDL are manufactured by Gates Rubber.Belts for drives carry
no warranty of any kind, as sold either as individual replacements or complete drive kits.
11MM
Early Model Without Idler. Outer front pulley guides allow
100% belt-to-pulley contact for superior belt tracking. Idler
system not required as this unit is for models with adjustable
transmissions only, kickstart. 11mm x 1½" wide.
VT No. Fits
Replacement Belt
Tapered shaft Open/Closed primary
Splined shaft Open/Closed primary
Note: There is no warranty on belts sold as part of kit or indi-
vidual replacements.
8MM Closed
Closed Primary for 74" and 80". Designed to fit inside pri-
mary cover. Increases horsepower, mileage and
quiets engine while retaining stock appearance. Closed
Primary. Kick start only 8mm. 1½" belt type.
VT No. Years Replacement Belt
Electric Start Models (8mm). 1½" Belt type.
*Note: For models with belt drive.
11MM
Primo 11mm Belt Drive Kits Late Model With Idler elimi-
nates excess belt movement during acceleration and deceler-
ation assuring smoother driveability. Measures 11mm x 1½"
wide.
VT No. Fits
Replacement Belt
Closed primary 4-Speed
Electric Start
Primo 8mm “Brute Classic" and 11mm “Brute II" Belt Drive
and Pro Clutch Combination Kits feature 11/2 belt and
updated diaphragm spring operated clutch. For aluminum or tin
primary covers 1937-84 4-Speed Big Twins. Electric start units
are noted *. All other units are kickstart only.
8mm
Rep. Belt 11mm Rep. Belt Year/Type
—
1979-84 Splined
w/Rear Belt Drive
—
Repl. Clutch Pak
for Above Drives
Brute Classics
