FYI if the cvt you got is a comet knockoff with a 3/4" bore it probably won't work for your 5/8 with sleeve. Reason being, a sleeve is only 1/16" thick and may just get torn apart.. There is no set screw holding the cvt on the crank, and the key is part of the cvt parts, which means that with a sleeve only 1/32" of the key will actually be driven by the crankshaft and it will likely fail soon, permanently damaging your crank. The cvt driver spring unit actually hangs off the edge of the crank maybe .650". Also I have heard of people snapping the 5/8 predator shafts when using a TC. If you are decided on he cvt I think your best bet to using a cvt is to get a driver with 1" bore and use a step up sleeve for that size.
Don't believe everything you read here. Most people are just repeaters, repeating the same stuff they've heard others say (get a cvt, get this, get that) without actually knowing wtf they're talking about when discussing engines other than the standard 5hps or 6.5hp clones.