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Primary and secondary clutch will come assembled if you let us know your tire size and modifications. Not every vehicle is the same, so even if having us professionally set the clutch up, some adjustment may be needed. Always make sure to check peak RPM after installation.
Our Defender S4 clutch kits pack a huge punch! No matter the terrain, they hit hard and just keep pulling for days. On the farm, trail or even at the race you'll notice excellent belt grip, power transfer, wicked acceleration and instant clutch response when getting back into the throttle after hammering that corner. In the dunes you'll see the same benefits, but also have much less bogging when climbing that big dune. The machine will hold RPM so you can get where you need to go, and get there faster! Going mudding? Our mud setup will help turn those tires through the thick and deep with much better RPM and wheel speed that's key to climbing out of that hole. Are you a rock crawler? Our smooth engagement and precise feel down low will give you the confidence to tackle any obstacle. We have a huge amount of CVT knowledge, a great passion for the sport, and spent many hours testing different setups in the real world. We know you'll be extremely pleased with the performance gain from our clutch kits!
The factory clutches these heavy, making them ramp up RPM slowly. Once you ride a properly clutched Defender that ramps up RPM quickly, you'll see the major difference. This comes into play if you are running heavier tires, riding dunes, or tune your Defender. Allowing RPM to ramp up quickly is a massive difference and if your tunes are built like ours, they love to rev higher and that makes them accelerate much faster.
Our custom cut AA 1053 fully adjustable helix in this kit is a game changer! We have been using this quick click secondary design on many other vehicles since 2008, and have now adapted to the Defender platform. This helix angle is much better for acceleration as it allows RPM to ramp up quicker out of the gate, then load the motor hard up top for wicked acceleration. The best part about this helix is the ability to adjust your spring tension. This easily allows you to dial in RPM with the secondary clutch which is much easier than adjusting the primary. See the helix install/adjustment HERE
Our setup guideline will let you know how to set your weights for stock horsepower or tuned, 27" - 35" tires, 28-32" paddle tires, different altitudes & more. If running higher HP such as an aftermarket turbo kit, let us know.
When adding larger tires or more vehicle weight, the Defender loses peak RPM and acceleration suffers. Even stock they only turn 5500-6000 RPM peak. We really like to see them at or just over 6000 RPM with the OEM tune. However, we HIGHLY suggest our tuning for the Defender when clutching as you can dial it in for 6400-6700 RPM and the vehicle really comes to life. The combination of tuning and clutching is hands down the way to go. If you have another company's tuning, our kit should still work well at that RPM as long as they did their job.
Our Recoil clutch weights are easily adjustable with simple magnets. They have a custom AA profile, the BEST coating on the market (nitrocarburizing) which has increased wear resistance, improved fatigue strength, and added surface lubricity. These clutch weights also offer great performance, and the ability to tune for many different applications or modification in the future, without the need to buy extra parts. The magnetic weights are the best option to properly place the mass where we need it on the weight for best performance for your application.
This S4 kit is a complete clutch set up for your Defender HD9 and includes:
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