After starting it a few times through the winter with stabil added, I went to ride and the bike will not start. I replaced the inline fuel filter (an aftermarket add-on), cleaned the petcock filter ( was already clean) and verified fuel would run out when on "prime". When trying to start it I did have a solitary back fire through the exhaust with a couple attempts to start (run less than 1 second). I noticed I can not add fuel to the line distal to the filter (trying to prime the carbs). The gas seems to only fill the gas line itself. Also, with everything connected, pet cock on prime, it will not pull fuel to fill the in line filter. Everything is stock. I figure I have a clog somewhere where the gas line goes into the carbs. Any ideas of where else to start or any other problems that may be the reason it won't start will be greatly appreciated. I feel like it is a lack of fuel since no overflow. As I said I ran it around the block a few weeks ago and it seemed ok once it warmed up. Thanks you all. It's been a long time since I have been on here. I'm really itching to ride.