i need help. just got a 03 660. traded for a 660 with a broken cam jacked head, and cover. put it back together last night. it starts great,idles great but will not rev up loaded or unloaded. it pops like a Evalve hanging open. it gets warm fast, my conclusion is running lean like big jet carb is not feeding. didnt see anything major clogged or gummed up. previous owner had a 144 and 146 jet in, changed to 145&150. didnt try to start it again yet, any other ideas? could it be the parking break stuff?