Rode bike on Wed. night-it ran great but I noticed a trace of white smoke coming out of exhaust. Got home today and wouldn't turn over. Acted flooded with gas coming out of carb. hose. Followed usual routine with compression release to clean out carb but no go. Checked and replaced fouled plug but with same results. It fires (and sometimes backfires) but will not continue to run. Any quick suggestions? Riding early tomorrow morning!