PRIMO'S BRUTE-IV OPEN BELT DRIVE KIT
Rivera Primo
#237446
£3694.94£3325.45
Member£3140.70-15%
Clutch & Primary
1,667 products
Clutch plates, springs, baskets, primary chains, compensators, and inner primary housings for Big Twin, Sportster, Softail, and Touring platforms. Spans Shovelhead through to Milwaukee-Eight. A slipping clutch pack or worn primary chain is worth sorting before it gets worse — this section covers both routine service and full primary rebuilds.
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Showing 1–48 of 1,667 DRIVE LINE-CLUTCH
Clutch
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Common questions
Can a Drag Specialties Extra Plate clutch kit handle more torque than a Screamin' Eagle clutch upgrade?
At Stage 1 and Stage 2 power levels both kits are meaningfully stronger than stock — the additional friction plate in the DS kit adds clamping area and back-to-back performance is similar in that range. The SE kit has the edge on warranty clarity when dealer-fitted; the DS kit costs less. For Stage 3 builds and above, neither kit addresses spring pressure, which is the real torque limiter at that power level.
How do I check whether the Harley primary chain needs adjusting?
With the bike on the side stand and the engine cold, remove the derby cover and check mid-span deflection on the primary chain — Harley spec is 5/8 to 7/8 inch on most Twin Cam and Milwaukee-Eight models. A slack primary clunks on startup and when rolling off throttle; too tight and it loads the front bearing. It's a 20-minute job and one of the most skipped items at annual services.
Can I use standard gear oil in the Harley primary chaincase?
No. Harley specifies primary chaincase fluid (or Syn3 for the synthetic option) because the wet clutch needs a lubricant that won't cause the plates to grab. A JASO MA2-rated gear oil of the type used in the gearbox will cause clutch chatter in the primary. Use the correct fluid — the saving over a few pounds isn't worth the noise and wear.