EC 300 problem!!!!!!!!

[clerky clerk]

Hi all, I am back with my problem ec 300, I still have the flat spot on full throttle, both low end and mid range are great, but wont rev any more from there. I have now changed the main jet for 175 then 172, I have checked inside the timing cover, its all ok and dry and clean in there, the pug is fine, the pv is working smoothly and opens when it should, I have new carbon reeds, a repacked silencer, cleaned and re-oiled air filter, and a full engine rebuild, but still, still, still!!!!!!!!!!!!!!!!!! the bike wont rev. I have tried the N1ef needle in 1st 2nd and 3rd slots to.