Hi finfan. Lots of folks know how to better then I how to do it. As a last resort, a muffler shop would be glad to help ya. I find they love motorized bicycles and the whole shop stops working to check out your bike.
Mine was just a wee bit off and the peddle was just barely touching it. I kicked it, snork. Not that I am suggesting that. I have used a rubber mallet successfully as well for small "adjustments" Be sure to use joint compound.
"One more thing: 6 HOUR INSTALL MY FUZZY BUTT!!!!!!!!!" LOL 80ccs, gets 250 MPG and the check is in the mail.
Looking forward to your pics.