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.

The clutches of Knuckleheads, Panheads and Shovelheads originally use ten strong coil springs. With a foot clutch or a “Mouse Trap” this is no problem — but with the hand clutch, which became standard on Harley-Davidson models from 1965 onwards, things are different. Harley did offer weaker clutch springs and an additional pair of plates for this configuration, but adjusting the springs properly was still tricky. The Pro-Clutch replaces the ten coil springs with a diaphragm spring, similar to those used on Evo models. When correctly adjusted, it even provides a self-energizing effect: once you pull the clutch lever past a certain point, the pull becomes progressively lighter. Thanks to the more than 50% larger friction surface, the same power is transmitted with less spring pressure. As a result, the Pro-Clutch requires less hand force to operate. In addition, the Pro-Clutch features a double-row ball bearing with seals on both sides to guide the clutch basket. Spring preload is adjusted by evenly tightening four nuts — no distance measures, no indexing of nut faces into notches. Just simple and easy. The kits fit inside the original clutch basket and require no more space than the old 10-spring clutches. They also fit inside the stock primary chaincase, and installation is no more complicated than that of an original clutch. Each Pro-Clutch kit includes a clutch hub with bearing, friction and steel plates, a pressure plate, a diaphragm spring with retainer plate, four spring adjustment nuts, a clutch hub nut with seal, and English installation instructions.

Starter ring gears for Primo belt drive clutch baskets.

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.

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.

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.

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.

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.

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. These are 3” versions for open applications.

Early model belt drives featuring the ultra severe-duty 11mm Aramid Polychain belt.

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

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.

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

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

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 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