From cold start, at around 65 degrees, if I dial the idle screw all the way counterclockwise and fire it up, it idles just fine and runs well for 10-20 seconds. Problem with this is once it's "warmed up" it stalls because it has no idle. Makes it difficult to ride, coming to stops, have to really watch rpms or it will stall.
If I try and adjust idle to "normal", at cold startup, it revs up out of control for a few minutes then finally calms back down and idles close to normal. Coming to stops, it still has a problem of wanting to keep on going.
Is there an automatic choke of somesort that kicks in somewhere from the carb or a computer chip?
I'm going to go ahead and replace all internal parts of the carb for good measure, all jets, diaphram, and scews.
thanks for any help you can provide, I took a video, but in this case, words were better to describe.
If there were a vacuum issue, would it occur within the carb? Is that what the diaphram is for?