I just bought a kanke waco upf 7 w/ a JBA .75 .I'm having a serious problem w/ this thing. 1) it is soooo tight it will baerely make one revolution. 2) when i turn the hsn out , it does not effect the way the engine runs. I went 4 turns out and it didn't richen at all. Though air leak , but I sealed the entire engine and , no change. thought was fuel line , no change , different tank , no change , any ideas , please let me know.