This also happen to me with a china diaphragm its not idling well and and droping . So i out back the original one I saw we havw the same under the diaphragm the are 2 holes and the original one only have 1 🤷🏽♂️
The actual 280 chip has a small hole to detect absolute pressure. How did you seal the BME280 sensor to allow a tube to be run each carb? I realize this video is pretty old but I’m working on a similar project for my 6carb Honda Valkyrie. Also did you experience electrician noise generated by the engine or alternator. If so how did you filter it? Thanks, hope your still available to answer before I start ordering stuff.
I had the opposite problem on a Honda Integra 750, the radiator cap (From Gmarket (W1,800) inner part cap was larger than the Honda OEM cap and it would not close. I think I might try the Hyundai radiator cap you were using and see if may work on my motorcycle. Thank you for sharing.
You have to keep both handlebar clamps on remove the 2 screws from the right one then place the short spacers in to the holes where the screws go then fit the bracket on top of the original clamp and tighten with the longer screws from the kit.