I looked at a YZ 450 tonight that appears to be in really good shape but for some reason it really didn't want to run unless the choke was on. The owner said the bike has sat since last July without being run but that it had Stabil in the gas when it was parked. Has fresh gas in it now but it still only runs with the choke on. Now it was about 35 degrees out so I'm wondering if that had something to do with it? I really can't beat it for the price but I don't want to have a major issue trying to get it running correctly. Could it just be the temperature now or maybe the carb just needs a cleaning? Thanks for any help.