Hi everyone,
New problem...when I'm sitting in neutral, and rev the engine, when I let go of the throttle, the engine slows to a near death, sometimes to a compete stall. I've uploaded a video:
https://www.youtube.com/watch?v=DagCJxxGyr8My most recent change is a new battery (my old one was still ok, but was getting old, and I'd suspected a weak spark). I have been playing around with the idle mix screw, because over winter I'd put new cam followers in, so I thought I'd try to tune the carb. (the previous owner had already removed the removed idle screw cover.)
I'm about 2.5 turns out, though the engine runs okay anywhere from 1.5 to more than 3 turns out. I've never opened the carb, so AFAIK I have the original jets (though the missing idle screw cover maybe points toward a prior rejet?)
I haven't noticed this since putting the new battery in, though something similar may have happened while I was riding (which let me to believe a weak spark, etc.etc.). So the battery may be a red herring.
Thoughts? Maybe slow fuel line? (I have a Raptop.) Water somewhere? (I washed the bike recently.)