If the valve is extended it is working. If extended and hot when removed it will take a good half hour to retract to cold position. Yes the carb could be dirty, the low speed jet if plugged will cause your problem and to a greater degree when hot cause the enrichment circuit is off. Pull the jets and clean them with compressed air if possible also blowing out all orifices the fuel flows thru. If you will be setting up for a while you should alway run the carb out of fuel this will keep the sediment from forming and plugging things up. TOM
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