The Primo Brute IV Kit comes with the belt and related pulleys, a new clutch assembly, and all of the needed hardware.
(1.)Receiving the Primo belt drive was a '06 Road Glide that is being transformed into a hot rod-inspired ride. Owned by Ed Syer, who is also the owner of Huntington Beach Hogs & Choppers in (where else?) Huntington Beach, California.
(2.)The Roadie had been fitted with a 131ci engine that was built by T-Man Performance. It features high-performance heads, pistons, and cams to go with the S&S; crank. The Horsepower Inc., 58mm throttle body works well with the Huntington Beach Hogs & Choppers exhaust system. Horsepower is rated at 156 hp.
(3.)With the primary cover removed, the dual roller chain and clutch were revealed. The stock unit is a good working system, but wasn't giving the bike the look that Syer is looking for.
(4.)Removing the stock system is simple. An impact gun was used to remove the mounting nuts holding the clutch assembly and the front pulley, and the pieces were pulled off as one.
(5.)With the mounting bolts removed, the inner primary cover plate was pulled from the engine as was the inner bearing race on the transmission main shaft.
(6.)With the area exposed, it came time to inspect the engine and/or replace any seals.
(7.)The main shaft and tranny shaft were cleaned (as was the rest of the engine), the Primo adaptor plate was installed.
(8.)A few taps with a rubber mallet ensured that the plate was properly seated.
(9.)The starter coupler was lightly greased and installed onto the starter motor.
(10.)The bolts were torqued to 30-32 lb-ft.
(11.)Adding some looks to the situation, a Primo cover (PP-400) was used. They don't come with the standard beltdrive kit, but are available through Primo, and add plenty of style to the mix.
(12.)While the unit can be installed by one person, but having four hands really makes the job easier. With the unit on, the fit and alignment was eyeballed. Proper alignment is crucial, without it the primary belt will be forced to absorb more punishment than necessary. Not only will misalignment cause premature belt failure, it will diminish the system's ability to deliver proper power transfer between the engine and transmission, so checking to make sure that the unit is aligned is important.
(13.)With a few drops of Loctite on the threads, an impact gun was used to install the main nuts. They were torqued to 150-165 lb-ft.
(14.)With anti-seize applied to the threads of the studs, the pressure plate was installed. The shouldered nuts were tightened equally and in a rotating pattern, and then torqued to 30 lb-in. The tabs of the locking plates were bent over the nuts to keep them from coming loose.
(15.)The belt guard was then installed. And with that, the job was done. The belt guard can be powdercoated to match the paint or it can be polished. Primo also has a wide variety of covers, so if flames or a more subtle design is your deal it has you, well, covered.
(1.)The Rivera Primo-TPP Variable Pressure Clutch Assist was designed for use with the Rivera Primo Pro Clutch only. It is not designed for stock clutches.
(2.)We installed the Rivera TPP pressure plate, diaphragm spring (black), slinger-arm head assembly, lock clips, and special length shouldered nuts.
(3.)We tightened the shouldered nuts equally until bottomed, and the diaphragm clutch spring was compressed to within 0.010-to 0.020-inch of being absolutely flat. Though these nuts were not really torqued to any specific number, a torque wrench was used to ensure that the hardware was at least evenly tightened. Again, time taken here to do the install right makee the clutch pull and operation smoother. With the nuts tight, the locking tabs were bent against the nuts.
(4.)The unit was on and ready. It looked right at home on the hot rod Road Glide, but Syer will have to remember to keep his leg out of the way; it looks like a pants-grabber, for sure
Installing A Primo Brute IV Open Belt System
As the name suggests, the line of Primo Brute open beltdrive systems look mean and ready for business. They feature a wide rubber belt whose inspiration came from a top fuel dragster and adds not only looks, but the ability to handle the added power of a high performance engine.
Thanks to testing and tweaking the compounds used in their manufacture, the belts offered by Primo are now virtually maintenance-free. Made with a fiberglass core that is wrapped in a rubber jacket, the belts come in 1 1/2 to 3 1/2-inch widths. The belt and the pulleys feature a 8mm HTD pitch. The result is a system that is as at home on a bagger as it is on a full race bike. A variety of covers are available for the Brute, some feature flames while others have cool, almost geometric, designs. The Primo unit comes with a complete Rivera Primo Pro Clutch assembly. Equipped with Kevlar-enhanced friction plates, the Pro Clutch is designed specifically for the beltdrive. Replacement clutch plates and pieces are available from Rivera.
Not many baggers could use a Brute open belt system as much as this one, this '06 Road Glide has a decidedly hot rod look going for it. And its bite is as bad as its bark because it has been equipped with a high-performance 131ci engine. The Primo Brute IV model is the perfect accessory for the bike because it will not only add to its performance, it will add the perfect aesthetic touch. We were on hand as Southern California's Huntington Beach Hogs & Choppers' employee Trey Mills did the install. He had the Primo unit in place in short order.
Whether it is the industrial design of the open belt or the performance aspect that you are looking for, the Primo beltdrive system will deliver.
(16.)Besides alignment, belt tension should be routinely checked. Tension is checked with the drivetrain cold with a steel ruler up against the belt. The total amwount of deflection should be between 1/2 to 1 inch.
Installing A Rivera Variable Pressure Clutch
Since he was installing a Primo belt kit, Syer also chose to upgrade the clutch action. He wanted a clutch pull which would be easy on the hand, but with increased pack pressure at higher RPM over stock. To that end, he installed a Rivera "Variable Pressure" pressure plate assembly to the Pro Clutch that comes with the Primo.
According to Rivera, its "Variable Pressure" pressure plate assembly can deliver up to 50 percent easier clutch lever effort, while still providing a 60 percent pressure increase in clutching power. The TPP Variable Pressure Clutch is for use with all Pro Clutch models, and fits under most OEM outer primary covers with stock derby covers with the exception of the '06 Dyna.
Installation is simple; pull off the stock pressure plate and bolt on the Rivera unit. The key is to tighten the hardware evenly, as the action of the clutch is at stake.
If nothing else, the slinger arm assembly is way better looking than the regular Primo unit, and works with the open belt design of the Brute IV on a visual level. Add to that the easier clutch pull and increased performance, and the Rivera TPP Variable Pressure Clutch is perfect for this ride.