Have you looked at the pilot jet? I had to change up on the pilot in order to get a acceptable plug reading. I lost my database awhile back so everything I state comes from memory and that is not totally reliable but I think I ended with a 145 main and a 38 pilot. The 30mm carbs I purchased did not have any main or pilot jet sizes stamped on them At first try I could immediately tell they were way too lean. Using a wire gauge, the supplied main was about a 135 and the pilot was some thing like a 28 so I purchased a wide range of main and pilots sizes and started with a sophisticated wild ass guess.
keihin jets part # main- 99101-393, 140 to 160 ranges
pilot- N424-21 35 to 50
This is on a motor 155cc, 30mm port matched head, and a 7/8ID x 28" long exhaust. Your motor configuration will make a difference in jetting.
Your moving along faster than I can respond to the posts but hopefully this info may help.
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