I realized this morning that my carb seems to be losing a little fuel when parked, I think into the engine. When I turn on the petcock I see fuel flow, which shouldn't happen. I'm guessing it's the needle, but I could be wrong. Any suggestions on where to pick one up, or what else to replace while I'm in there?? The OEM needle is fairly expensive ($16... a lot for what it is) and in my experience OEM parts take forever to ship.