How to synchronize carbs?

[Capt dave 258]

I have a 2001, 80hp carbureted 4 stroke Yamaha. Can someone direct me to the procedure for synchronizing the carbs? Put fresh plugs in it and after one season they are all carboned up. Thanks

 

[99yam40]

find the Yamaha service manual for your motor, it will have the procedures.

but I would think the carbon build up comes from burning oil

 

[99yam40]

also just to let you know ,you have to close all of the throttle plates completely, not just with them sitting on the idle screw.
and then hook up the linkages between the carbs.
then adjust the idle speed screw to have all throttle plats opened exactly the same amount.
then mess with the idle mixture screws

you cannot have some throttle plates open more than others

 

[lelyyy]

Yeah, I had a similar issue with my engine a while back. First thing I checked was the oil level, just to make sure it wasn’t burning oil too quickly. Then I borrowed a vacuum gauge to compare the vacuum from each carb and started adjusting them slowly. It was really a hassle. I didn't do it properly before, and the car was shaking a bit when driving.