Other things that are sometimes helpful to try are: Switch to a colder spark plug Jet for a richer mixture. And of course, back off the advance. Detonation usually means you're running to hot, you need to figure out some way of cooling things off a bit.... Dave _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list