If it,s a piece of crud in the needle & seat you usually can clear it out with this methed. Put a vice grip on the flex hose by the fuel pump to block off fuel flow. Start the engine & run it til it dies or almost dies. Remove the vice grip & restart the engine. If once doesn,t do it try it again. When the carb gets out of fuel the foat drops way down opening up the needle valve all the way. When the fuel comes rushing in it flushes the particle past the needle & seat. If 2 times doesn,t work it,s time to dissasemble the carb. This has worked many times for me, saving tearing down the carb. Sometimes this happens right after changing fuel filters.
