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Have you tried cleaning the mixer?  A dirty mixer will cause all kinds of starting issues.


I am betting you have a vac leak/issue.   The button on the vaporizer purges fuel past the diaphragm into the feed line to the mixer.  This means you ate getting fuel there and it's not freezing up.   The little port on the top/front is a vacuum reference designed to read atmospheric.  


To clean the mixer,  take the 4 small bolts or of the top and pull the cap off.  There will be a spring under it with a diaphragm.   Pull that out and you will likely see carbon and dirt around the outside and throughout the mixer.   You will also see how the ports route inside it.   There are 2 mixture screws on them.   One is the screw with the spring on it coming out the side.   The other is a half turn type under the fuel inlet port.   The stainless one should control idle with the other controlling top end.


If the diaphragm in the mixer is dirty it will stick and will need more vacuum to move it causing less fuel to flow.


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