Rivera Primo

To be used in combination with aftermarket 66 T ring gears on 5 speed Big Twins 1994-up. The combination 66/9 teeth has been proved sturdier than the stock 102/10 T combination.

These manifolds allow direct installation of S.U. carburetors on all Shovelhead and Panhead engines. They replace the original manifold and are designed to drop and tuck the carb closer towards the engine. This results in more clearance between the rider's leg and the gas tanks.

Update your old 4-speed Big Twin from the old coil spring clutch to the late style diaphragm spring clutch which proved to be superior right from the start when it was introduced in 1985 on Evo Big Twins plus the Pro-Clutch friction area is increased by almost 100%, which allows a decrease in diaphragm spring pressure. For the rider this means less effort at the hand lever, smooth control and still excellent horsepower handling potential. Repeated burn-outs or two-up serpentine riding in the mountains with frequent clutch dragging are no problem for a Pro-Clutch. All kits install quickly and easily into the stock chain housing. The kits for 4-speed Big Twins from 1936–84 come with a durable double-row ball bearing that replaces the shaky stock “caged bearing” for a sturdy connection between mainshaft, hub, and basket. The stock clutch basket may be retained. All Pro-Clutch kits include a clutch hub, friction plates and steel plates, stainless steel pressure plate, diaphragm spring, spring retainer, four shoulder nuts, a clutch hub nut with seal, and installation instructions.

Starter ring gears for Primo clutch pulleys.

The original Primo belt idler can also be ordered individually to retrofit earlier production belt drive kits. Thousands of test kilometers proved its high quality and reliability.

A simple way to eliminate leakage of transmission oil through the mainshaft when running open belt drives.

Genuine Primo sprocket shaft nuts and washers for the front belt pulley.

Hardened steel offset inserts for front Primo belt pulleys. They replace the standard inserts and allow the builder the freedom to offset the primary/transmission for the use of a wider rear wheel and tire assembly.

Primo belt drives are developed and manufactured by Harley riders for Harley riders. Before the first Primo belt drive was sold, the belt drive systems had been tested on a Top Fuel drag bike until they would stand up to the strain. Each kit consists of the complete belt drive unit, a sprocket shaft nut, all necessary hardware and detailed installation instructions.

Special pulley nuts to work with front primary pulleys that have offset inserts.

Nostalgic cowbell styled air scoop for your S.U. carburetor which looks cool and prevents your jeans or monster bugs from beeing sucked into your motor. The bell can be rotated in the adapter plate to point into various directions.

Primo belt drives are developed and manufactured by Harley riders for Harley riders. Before the first Primo belt drive was sold, the belt drive systems had been tested on a Top Fuel drag bike until they would stand up to the strain. Each kit consists of the complete belt drive unit, a sprocket shaft nut, all necessary hardware and detailed installation instructions. These are 2” versions for more of engine power. The clutch shell will not fit into standard primary cases.

The main reason for premature belt failure is the misalignment of front and rear pullies. These spacers are designed to be used behind the engine pulley to achieve proper front to rear pulley alignment by using the proper thickness shim.

Primo belt drives are developed and manufactured by Harley riders for Harley riders. Before the first Primo belt drive was sold, the belt drive systems had been tested on a Top Fuel drag bike until they would stand up to the strain. Each kit consists of the complete belt drive unit, a sprocket shaft nut, all necessary hardware and detailed installation instructions. These are 3” versions for open applications.

Early model belt drives featuring the ultra severe-duty 11mm Aramid Polychain belt. These belt drives are designed for enclosed primary fitment, either within aluminum primaries or within tin (stamped steel) covers. For the later aluminum primary models (1965-1984) two kits are offered for kickstart and electric start models. The earlier tin primary models are available for tapered (1937-1954) or splined shaft (1955-1964) applications, kickstart only.

For single throttle cable application. Works with most any type of control cable.

Complete kit to convert S.U. Eliminator II carburetors to dual throttle cable.

Motor pulley by Rivera Primo; for Belt drive; fits Big Twin 1937-1954; steel / cast aluminum; width: 1.5”; pitch: 8 mm; number of teeth: 39; USA; gross weight: 1 kg

Motor pulley by Rivera Primo; for Belt drive; fits Big Twin 1937-1954; steel / cast aluminum; width: 3”; pitch: 8 mm; number of teeth: 47; USA; gross weight: 1.62 kg

Motor pulley by Rivera Primo; for Belt drive; fits Big Twin 1955-1984; steel / cast aluminum; width: 1.5”; pitch: 8 mm; number of teeth: 39; USA; gross weight: 920 g

Motor pulley by Rivera Primo; for Belt drive; fits Big Twin 1955-1984; steel / cast aluminum; width: 2”; pitch: 8 mm; number of teeth: 47; USA; gross weight: 1.37 kg

Motor pulley by Rivera Primo; for Belt drive; fits Big Twin 1955-1984; steel / cast aluminum; width: 3”; pitch: 8 mm; number of teeth: 47; USA; gross weight: 1.58 kg

Motor pulley by Rivera Primo; for Belt drive; fits Big Twin 1965-1984; steel / cast aluminum; width: 1.5”; pitch: 8 mm; number of teeth: 41; USA; gross weight: 940 g

Motor pulley by Rivera Primo; for Belt drive; fits Softail 1986-1997; steel / cast aluminum; width: 1.75”; pitch: 8 mm; number of teeth: 45; USA; gross weight: 1.2 kg

Motor pulley by Rivera Primo; for Belt drive; fits Brute IV Belt Drives; steel / cast aluminum; width: 3”; pitch: 8 mm; number of teeth: 48; USA; gross weight: 2.1 kg

Belt drive by Rivera Primo; for open or closed applications; fits Big Twin 1936-1954; steel / aluminum / polyurethane / carbon fiber; width: 1-1/2”; kickstart only; sprocket shaft type: tapered; pitch: 8 mm; number of teeth: 39 x 61; USA; gross weight: 3.75 kg

Belt drive by Rivera Primo; for open or closed applications; fits Big Twin 1955-1964; steel / aluminum / polyurethane / carbon fiber; width: 1-1/2”; kickstart only; sprocket shaft type: splined; pitch: 8 mm; number of teeth: 39 x 61; USA; gross weight: 3.55 kg

Belt drive by Rivera Primo; for open or closed applications; fits Big Twin (4-speed) 1965-1984, except FXB, FXSB, FXWG 1984→, FLH Classic 1982, FLH 1983→; steel / aluminum / polyurethane / carbon fiber; width: 1-1/2”; kick & electric start; sprocket shaft type: splined; pitch: 8 mm; number of teeth: 41 x 61; USA; gross weight: 4.5 kg

Belt drive by Rivera Primo; for open or closed applications; fits Big Twin 1965-1984 (4-speed); steel / aluminum / polyurethane / carbon fiber; width: 1-1/2”; kickstart only; sprocket shaft type: splined; pitch: 8 mm; number of teeth: 41 x 61; USA; gross weight: 3.89 kg

Belt drive »Brute II Extreme« by Rivera Primo; fits Big Twin 1936-1954; steel / aluminum / polyurethane / carbon fiber; width: 1-1/2”; kickstart only; sprocket shaft type: tapered; pitch: 11 mm; number of teeth: 33 x 49; USA; gross weight: 4.16 kg

Belt drive »Brute II Extreme« by Rivera Primo; fits Big Twin (4-speed) 1965-1984, except FXB, FXSB, FXWG 1984→, FLH Classic 1982, FLH 1983→; steel / aluminum / polyurethane / carbon fiber; width: 1-1/2”; kick & electric start; sprocket shaft type: splined; pitch: 11 mm; number of teeth: 34 x 49; USA; gross weight: 4.68 kg