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Happy new year to all!finally i put back this part that i removed from the carb because i found out that this part is there to reduce the  heat from cylinder going to exhaust system,i didnt notice any better performace of the atv whith out it,just overheat the exhaust pipe thats why i put it back ..

this part in the picture,i will put it back ok

thanks for your reply,yes i know from distance is not possible to find a problem,im just trying to find a solution before i will decide to send it to kymco official service because is far from my place and it will cost me a lot of money,my mechanic here is not specialist to atv's anyway but hes trying also to find the problem,the mxu 300r dont have fuel pump,it have only a fuel switch valve that i replace already,i dont know if the rectifier produce 14-14.5 V i just use another one from same atv and didnt fix my problem,also i use another ignition coil and cdi unit from the other atv with no result,in the clutch service i replace all the springs inside main and 3 smaller,the clutch shoes are well,before few days start another problem when i try to put reverse from high its very difficult,i need to go to low first and then it will move all the way back to reverse,the atv was abandon for a year before i bought it if that helps you also..thanks again for your help!

thank you!this model dont have fuel pump,i replace already releys and ignition coil with no result,wheel bearings also,breake disk are fine,the atv run normal till reach 45-50 kmh with no problems,after the 45 kmh start this problem,thanks for your advices!