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The two sleds you own have different torque curves which means the clutching is quite different too. Your 580 probably needs to rev a little higher to achieve the same torque as your Wildcat. I would not reduce engagement RPM since that will create a "bog" when you start out. If you want more of a rip off the start, try putting a stiffer spring in to raise the engagement. 4,500 rpm should be just about right though.
Also, 3,500 RPM seems kinda low for an engagement for a 700 Cat. My 650 Wildcat would engage about 4,800. If you want to replace a primary spring, I would change the one in your Wildcat. If there are many miles on the Wildcat, it could use a new spring and probably everything else in the clutch. I had to rebuild the primary in my 650 about every 1500 miles. Those twin "paintcans" really vibrate the hell out of everything.
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