1st post and I'm glad I found this place. I rebuilt my stock carburetor on my 1978 Harley XLCR Cafe racer last weekend. The bike had been running well enough but had a strange flat spot right at 4,000 RPM - right where it wanted to run at 65 on the highway. Anyway, after rebuilding the carb, everything has gone to he)). The bike starts but won't idle. It isn't happy running anywhere below 3,000-4,000 RPMS. Its either full on or nothing, won't idle and won't run down in the lower revs. I have to use the choke like a throttle to keep it running (at (3,000 RPMS) - closing the choke about half way, then openging again acts just like the throttle. I've had the carb off and apart and back together agin about a dozen times since this started, and nothing I do affects this at all. At first I thought it was a leak between the carb and the intake, but I've changed the O-ring, used gaskets, used gaskets and O-rings - no change. I've thoroughly cleaned and blown out all the passages. If anyone can help diagnose and fix this, I will be deeply indebted. Help - I want to ride again! Thanks.