i called hmf today about my junk dobeck, by the way had to send to dobeck not back to hmf, and talked to john and asked about tuning the dobek. i asked why does hmf and dobeck tell us to set the 4th pot to 9 . i would think this wouldnt allow the 3rd pot to come on till 9000 rpm. he said for some reason the dobeck is off by 3000 rpm. this would mean at 9 you are telling it to open at 6000. so all of you setting it way lower you are only dumping fuel and choking it. i was running at 6 this would mean i was shutting off the accel portion or pot 2 and dumping alot of fuel that is not needed. john @ hmf said that dobeck needs to change this about it... thought you all would like to know..