Hi, Recently got back into the xs650 scene after picking up a clean 1983 heritage special that was stored for a good periods of time... after getting it running I noticed the left cylinder is cold (exhaust). I've check spark and it's all good,compression is also good and new plugs. Cylinder stays cold at every rpm range...even when held at 4k. The right carbs is wet from gas when I check the inside with my finger but left is bone dry...so I'm thinking it's a fuel issues but figured I'd see if anyone has any advice. I should point out that if I spark gas in the left cylinder while bike is running it backfires thru the exhaust. Thank you in advance!