Hello all, this may have been discussed before but I'm new to the site and can't find the information I need. So I'll make a long story short. I bought this bike and it doesn't run. Ive checked all the important stuff like spark and fuel. I'm getting spark to both cylinders. And I've got the fuel system cleaned out, including the carbs. When I go to start it the bike will turn over just fine but it spits and sputters and will not start. Sometimes I get a backfire or a pop here and there but no start. Any help or thoughts would be very much appreciated.