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.