So I've been trying to start my bike after storing it for a couple months. It doesn't start unless I push start it or hold open throttle while kick starting. Cant seem to figure out what it is. Cleaned jets, new plug, new fuel, new air filter. Any tips are appreciated. Not sure if this is relevant information but bike also doesn't idle once i turn it on, must always rev a little bit and significant black gunk comes out of exhaust. Bike is a 03 CR125 (2 stroke).