I had the same problem on my 1406, secondarys did not give me the power I needed. Here's what I did. When you look at the front of the carb, on the right hand side in front of the linkage, there is a rod that goes into the secondary lever. Out the box, this rod is in the middle hole, move it up to make the secondarys open up sooner. No jetting or anything like that unless you have done major engine work.
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