Just make sure that all 3 carbs are closed at idle.---Make sure that carburetors open at the correct time.----In my opinion this -----" link and sync "----Is really misunderstood and not as critical as some say.---Just my opinion and many will argue.----Now if someone really molested the linkages with wild guesses it is a different story.----What is your motor doing / not doing ?----What trouble shooting have you done ?