Having that picture you might also have some advice like ...
What do you set your timing at ,as mine is alittle hard starting after running her for awhile when set at 10 degree.
When set lower she likes to desiel on,when I turn the key off.
I also have a solex carb ,there is a upper air screw what is it set at on yours ..about 2 turns out. lower one set at 1 1/2