Bike ran fine (stock-including carb settings) throttle sticked so cleaned carb and put back together. Afterwards, wouldn't idle, misses/backfires from 0-1/4 throttle. Is very lean in this range. Cleaned pilot jet,(even went richer one jet) tried richer on air screw, nothing. Cleaned carb many times still nothing. Bike runs fine 0-1/4 with choke out. Any ideas on why the difference after cleaning carb. Thanks for any input.