clutch chatter on 212predator

I built a 212 on a mountain bike. Used the (china) torque converter. Worked perfect until the belt glazed then chatters on take off Bad. couldn't find a better belt or even the correct width and length. Changed to a (china ) clutch (all chain drive) and it chatters worse. Would a Comet clutch work smoother. It's rated for 8 h.p.

Thanks for the feedback racie35. My original belt started to unravel some threads then one section wore thinner which gave the engagement a learching as the thinner spot passed the engage pulley. Plus the chattering. I looked on e bay and could not find any numbers that matched or any way to match numbers and size. I googled it and only was more confused. Finally ordered one from e bay and it didn't fit. I found it a hopeless case.
I had gotten a clutch previously so I hooked that to a new chain to my jackshaft.
After resprocketing it for a ratio change, The clutch chatters worse but no learching.
After a few runs on it I noticed the clutch bell was very loose where it's connected to the sprocket and out of round. This can't help the chatter.
I want to ratio it fairly high to keep up with traffic. I'm sure this aggravates the chatter as well.
I ordered and received the comet clutch today so I'll find out this weekend.

The Comet clutch runs smooth. With a 6.2:1 ratio, I need to GPS it to see how fast it is.?
Still have the gov. hooked up.