I checked out that web site and man there is alot of information there! I am running the 650AVS carb. I beleive this carb. setup is a little lean due to the fact that I used to have a carter 625 with main jets that were .005 bigger. Man with all this information on tuning dist., and carb. it feels like I am in a maze and can't find the exit! I just don't have the experience for this. I used to be just a stock running engine guy before and never really worried about all this tuning! If anyone out there that can help me and lives in the Cincinnati area and can come help me with this tuning stuff please let me know!