Bike starts OK w/ choke, but never seems to completely even out at idle even after warming up. Has intermitent backfire at low rpm that is pretty rough upon starting but lessens with warmup, but does not go away completely.
What is the probable most common cause?
SOURCE: Rough idle and backfire at low end RPM
Many can cause this kind of problem, such as your jets are starting to clog-up, you have changed your jet-settings, you fuel bowl is not delivering proper fuel amount even dirty and clogged air filter can cause havoc,your ignition timing (magneto) has jumped (out of sequence because it is weaker sparks power), etc.
To start, does it idle properly after a good 3-5 minute warms-up in the past? Check you carb adjustments.
If this happened recently and you have not done or change any settings, try using carb-fuel jet cleaner from STP or Valvoline, etc in your fuel tank mixture when filling-up. Good enough?
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