Hello. I have installed PWK 24 on my Derbi Senda and it is running lean after opening throttle. Whenever I stand at a red light, it runs really rich. Then I quickly open throttle and runs rich like crazy and doesn't rev high. Smokes everywhere. Then I continue driving, and if I open the throttle while driving, it runs lean and goes to about 10-11k rpm's. I have installed a 5mm tap fuel inlet for the 5mm fuel inlet on the carburetor, but still, nothing has worked so far. I am running 140 main jet, and when checking the spark plug after a highway, half is pure light yellow, half is dark gray. Also I have installed a repair kit on the carburetor - new float bowl, float valve pin, screws etc. The symptoms show, that it is running lean due to the lack of fuel in the fuel bowl, but at the same time I have a brand new fuel tap and parts for the carb. I have asked for many 2 stroke forums what the problem might be, but they have no idea at all. I ask local mechanics and they also have no idea. Could anyone please help? Thank you!