Got an '81 sr250 that was found in the trash. Sweet little bike. 65 mpg in the city. Been running fine since I fixed it up, but now it will be running fine and then all of a sudden it will act like id's not getting gas. If I let it set for a while it will be fine for awhile and then boom it happens again. I think maybe it has something that clogs the jet and if I let it set it will unclog. Am I right? I'm going to have to fix it on the side of the road so I want to have a good idea of what I need to do.