changed cam timin and jettin engine doesnt pull

hello everybody im from honduras im havin problems i chaned my timin to yz and chaned

jettin to yz specs but when hit the throtle to the half the motor couphs and its hard to start i thin the spar plu fould at the first day when i assembled it bac went to a motocross trac it pulled fine but the next day it didnt want to run .it had that misterios couf and it stops .

i sent my carb to baja designs for rejettin

please help me with any information my e mail

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