I went to pick up a CRF 150F for my son. It was purchased new and hasn't been ridden for a while. It looks like it was well maintained. The problem is that it will only idle with the choke on. When you take it off (down) it stalls right out even after warming. The idle screw is turned the whole way in. I declined to buy it based on the fact it won't idle. The bike was cold when I looked at it and not previously started prior to my arrival.
It's a 2006 and I offered $1550 for it. I suspect the pilot circuit/jet is clogged from sitting. A new Carb is $250ish and a rebuild kit is around $50.
Do you think this is the most likely cause for it not idling?