I have a real difficult time getting engine to turn over. im nearly exhausted from pedaling before it wants to go on its own. spark plug is clean and new. carb has been disassembled recently and seems in good working order. once its running, there is no problems whatsoever. occassionally it dies at idle (at a red light for example). turns over with in couple pedals from stop.....any insight would be greatly appreciated. i need for my gasbike to be reliable and im picking up a little at a time.