Lister D running speed

My Lister D runs too fast. It has good spark and starts OK then revs up and needs to be stopped before it kills itself! I have checked the float chamber and
am pretty sure that is OK. I think it is the mixture control but I can't find out how to set it up after removing the needle completely from the carb. Can anyone help?
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My Lister D runs too fast. It has good spark and starts OK then revs up and needs to be stopped before it kills itself! I have checked the float chamber and am pretty sure that is OK. I think it is the mixture control but I can't find out how to set it up after removing the needle completely from the carb. Can anyone help?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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