i am running kehin carbs i was just wondering i am an industrial mechanic and when i got the bike the guy told me to just screw out on the choke to adjust the idle just on the left side and i got to thinking about it and am pretty sure they are not synched because of the years of just screwing in and out on the choke knob on one side and not ever touching the other ive been noticing lately it doesnt seem to be running as well but i really dont ride it enough to know for sure how can you do it without the tool i am mechanically inclined