I bought a 03 suzuki lt50 from a guy down the street all apart,I put it back together and it runs, but on the petcock,the gas line to the carb goes on the left and I am pretty sure the petcock on the right goes to a hose that goes to the cylinder(?)when I connect that it dies right away.Also the choke needs to be on to run. Cleaned carb but it looks like somebody has messed with it,also tried different ways,running it ,then turnig the choke off and vent hose hooked up still dies.I have worked on a lot of bikes but new to dual petcock/vacuum hose deally.Any info would help(cylinder vent?)