Ducati 60 sec how to throttle bodies synchronization adjustment guide how to.wmv





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Published on Aug 28, 2012

Ducati 60 sec how to sync throttle bodies adjustment guide. STUFF.
Now why would you balance the throttle bodies at 4000rpm and not tick over, well for a start, do you drive your bike at tickover !!!! is you engine being used as a static generator, No i didn't think so, why not just disconnect the throttle cables if your going to set them at tickover.

The reason I adjust the throttle bodies at or above 4000rpm is to make sure the cylinders are running the same at driving engine speeds, the engine is sucking a lot of air and you can also get a finer adjustment. There will also be less variation in balance from say a throttle opening of 1/8 to 1/4 to 1/2 to 99% open, than from fully closed at tickover to any other position or place.

Your bike will run a lot smoother at higher rpm if the throttles are balanced where they will be when your driving it. Setting the throttle at tick over and balancing them is just a waste of time., well it is if your going to use the engine past tickover.

The facts are we are dealing (more so in the case of a bank of 4 carbs) with wear, of all or any of the internal and external parts (like there are lots of things that will wear, not just linkage pins, pivots, rockers cams, the adjuster screw ends and the face that it rests on, the throttle slides as well, as well as the engine parts and valve gear) , all these parts move and will wear in different ways, from carb to carb and also cylinder to cylinder, so the only way to say that they are synced at a specific RPM is to run it at that RPM, this will also take into account any variations in compression and valve area for each cylinder at real world throttle positions and not tickover.

You could sync at 2000 rpm as well, but not at tickover.

Also in the case of CV carbs, at tickover the slides are fully closes. Noting that there no direct mechanical link between the butterflies (throttle plates) and the slides. So adjusting the butterflies at tickover is not going to be representative of the position of the slides when driving the bike.

If you had a brand new bike that came out of the factory with everything set perfectly, i'd still balance the carbs/throttle bodies at an elevated engine speed above tickover.

Also if anyone needs it, at tickover your bike is producing nothing, so any variation at tickover must add up to nothing as well, but at 9000 rpm (i'm not saying to sync at 9000rpm) your bike might put out 100 bhp at 80% throttle opening, excluding other factors, that is 25 bhp per cylinder on a 4 cylinder bike, if one throttle body is out of sync then that cylinder is not going to make it's full 25 bhp, it's also not going to run as smoothly as it could, blah blah blah....................................................................................................................................................................... is it coming through yet, it's a waste of time syncing at tickover.

please note: i'm using the carbtune 2 gauges, so there is no liquid that could be pulled into the engine.


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