[spirilis]

hm, interesting about the 80% figure, although I have a little trouble believing it. The CVT in my scooter is only air cooled. Though who knows, that might not mean anything. FWIW I am using a kevlar belt right now, meaning rubber with kevlar reinforcement bands inside vs. whatever they use in the stock belt (which I'll admit I'm not entirely sure... I just bought a new stock belt for my 24K mile service and it has some kind of reinforcement bands built in)

Not sure what you mean by the single vs dual CVT? I guess by that definition mine is a dual CVT -- front sheave assembly is 1 fixed pulley and 1 ranged pulley (called the Variator) and the rear sheave assembly is 1 fixed pulley (opposite side of the belt from the front) and 1 ranged pulley with a strong spring pushing it towards the fixed pulley.

The belt becomes stretched with more tension as more torque is applied from the engine so it helps prevent slippage. This is accomplished with clever design of the sliding mechanism between the rear sheave ranged pulley as it slides against the collar of the fixed pulley (the channels it slides on are curved so that greater torque application results in the rear pulleys wanting to come together to downshift, despite the fact that the front variator pulley's weights want to push the front pulleys together to upshift with increasing force as engine RPM's increase--result is that when you are twisting the throttle back hard and producing your greatest torque, it downshifts yet the tension on the belt is phenomenally higher than the tension on the belt during normal coasting, so the increased torque throughput is met with a belt that's so tense it won't slip).

Really a brilliantly clever balancing act done by purely passive mechanical means. I grin every time I think about it.