If it starts but won't run it probably is not the choke, if however it does not want to run when warm it could be the choke. It really is not a choke as most call it . It is an enrichment valve. What it does is: when engine is cold the valve needle is retracted allowing a rich mixture of fuel to flow through the enrichment circuit, as the engine is running about 9 volts are applied to the valve heating the capulary which extends the needle until it cuts the supply of fuel from the enrichment circuit thus leaning out the fuel on the warmed engine. To check unplug the wire to the valve, remove clamp screw then twist and pull valve out. Using paperclips shoved in from the back side of plug then using jumper wires put yellow to + and green to - of a good 12 volt source. watch that the needle expands outward as the unit is heated by the 12 volts. Looking in the body you will notice a spring if the spring compresses all the way the valve is working just fine and your problem is else where. I've been in this business since 2004 and have replaced only 2 or 3 enrichment valves. You also have to make sure you have power to the valve coming from the wire harness.
Tom
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