I'm running a Maxi with a Malossi 62cc kit, not case matched, custom high-comp head, 15 Bing with a 79 jet and needle clip on the second ring down, velocity stack with the foam removed, 16x45, timed at 16-17 degrees BTDC, temps hit low to mid 300s after a few mins at WOT. A while back I switched from an MLM sidebleed to a Cranks pipe, which I like a LOT (thanks Ryan). The bike goes bananas when the pipe hits, but I lost a little low end and have been trying to make it up without sacrificing top speed through gearing.
Part of the tinkering has been with the clutch, and I posted the other day about grooves I found inside the clutch bell after I pulled the old clutch out and found it beat to shit (even though it was performing pretty well). I've since replaced the shoes with OEM shoes, drilled/tapped/countersunk the posts for an MLM brace, and dropped in kickstart springs that release at about 37-38 lbs on the fish scale. (This is more tension than the previous blue spring setup.) I really don't know anything about transmission fluid and I've been using regular Type F ATF, and I knew Roffman would have some words for me about that so I picked up some 5w20 this afternoon.
ANYWAY, I can feel the clutch engage initially and give me a little push that feels promising, but it seems to briefly lose a little power and struggle for a few seconds after that. It's not quite bogging, but it feels like a loss or delay in engagement as the bike comes off the line. Once it gets to 10-12mph it's fine, and it hauls ass after that.
I have this theory that my torn-up old clutch had over time worn grooves into the bell that matched the ridges of the remaining pad material, making it a perfect fit despite its poor condition, and that the fresh pads are only making contact with the un-grooved part of the bell, for less overall grip until centrifugal force pushes it all the way in. I don't know if that's what's actually happening, tho.
If anyone has any ideas I'd sure like to hear them. I have a smoother bell on hand, but I'd rather not tear down the engine to install it now since the season's gonna end before long and I'll be rebuilding it in the winter anyway. Here's some clutch failure porn for your trouble.