I have a new 49 cc engine kit and am having a hard time with the clutch and chain. I assume that when I pull the clutch in (on handle bars) the bike should roll freely, thus letting me pedal. I pull the clutch in (disengage) and the bike does not roll. I have adjusted the clutch cable tighter and not so tight and still the same thing happens. Is the chain to tight maybe? I have a chain tension pully on it and the gap between the top and bottom chain is about an inch. The pedal chain is a little loose and the back tire cannot go any further back. Any suggestions?