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Throttle body balancing |
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Stevex 
Moto GP Alien 
Joined: 05 Jul 2016 Location: UK Status: Offline Points: 1481 |
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 Topic: Throttle body balancingPosted: 14 Nov 2025 at 12:33 |
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Obviously on a Gen 1 Tuono.
Firstly, are the ports used, front cylinder throttle body on the right side at the front with the blank on it? On the rear cylinder throttle body, on the left side rear port with the hose attached? Is the adjustment done at the linkage or via the air bleed screws? Any other considerations? Mine have not been done in my ownership, 12 years, so considering investing in a digital synchroniser test set.
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Spoonz
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Joined: 11 Feb 2008 Location: North Devon Status: Offline Points: 10957 |
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Posted: 14 Nov 2025 at 12:40 |
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Generally the bleed screws are left alone if not radically out of adjustment and the balance is set via the ecu trimmers. Requires take off pipes and a way of measuring CO.
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Stevex
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Posted: 14 Nov 2025 at 14:34 |
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Thx Spoonz.
All I'm looking at doing is ensuring the butterflies open in sync, why the need to check CO measurements? Can it not be done by comparing the individual throttle body vacuums?
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People say I don't know Jack Sh1t; but I do, he lives next door.
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Spoonz
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Posted: 14 Nov 2025 at 15:30 |
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The butterflies are on a common spindle so it’s not possible for them to be out of sync mechanically unless there is something wrong. The only adjustments are vac or CO. You can set the vac via the bleed screws but any alterations you make will lposdibly alter the CO setting as well. CO takes precedent over vac because as a setting it has a greater effect on the general fuelling. Often when the CO is set correctly per cylinder the vac is not 100% balanced. (The rear cylinder generally runs richer ) Aprilia state, that checking vac should be used to confirm general setting after replacement or repair etc but should be directly followed by a CO check to achieve correct fuelling. Hence checking vac is not usually part of the regular service schedule, just CO. That assumes you have a bike with active ecu trimmers , eg, not some early rsv’s or gen 2 bikes that have lambda etc.
In conclusion by all means check it but by balancing it, you may not necessarily be improving the fueling.
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Stevex
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Posted: 14 Nov 2025 at 15:38 |
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Great explanation thanks, learn something new every day.
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redratbike
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The Collector Messiah Joined: 07 May 2008 Status: Offline Points: 16331 |
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Posted: 14 Nov 2025 at 18:06 |
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Stevex wrote: