Balancing throttle bodies

Hi Andre. Just watched the one of the webinars about ITB. The question is how the vacuum set to balance the itbs would affect wot operation? Currently working on an Yamaha r6 engine uses a bypass between the throttle bodies. Should I balance it to a minimum vacuum or maximum ? The manual says 150mmhg as standard, but this is for a road bike with cat and a restricted exhaust. Since this engine is now on a race bike with less restrictive exhaust should I still set to the factory specs?

the photo shows the screw ( white mark) to adjust the vacuum and the vacuum ducts to measure it.

What tool are you going to be using to complete the balance Lino? I can highly recommend a Raytech SynchroKing https://raytechautomotive.com/products/synchroking-carb-throttle-body-balancer

Which model R6 are you working on?

Generally speaking, the balance of the throttles is going to have no effect at WOT. It will improve running at idle and throttle response when cracking the throttle from a closed state and running at small throttle openings. Once you open the throttle more than a small amount, slight imbalances quickly become diminished.

A small disparity in vacuum at idle has a big impact, but at WOT, you can have plates more significantly apart without impacting cylinder filling.

As Daniel mentioned, you sync them up at idle, and WOT operation will be fine.

Have a great day,

Hi Daniel, I am using a Toledo vacuum tester. Thanks for the tip I will keep that in mind always keen to get a new tool.

The bike is a R6 2010. The bike is struggling to rev past the 13-14k and I thought that this could be the cause of the issue.

Mike, thanks for the clarification too. I have attached the video at the dyno where it shows the issue happening. My second best guess it that the cam timing is wrong, since it was changed using adjustable cam wheels.

What's the afr looking like at this point?

AFR between 12.8-12.9 on this gear and RPM between 13300 and 13700