How to adjust throttle body air screws - MVAgusta.net
 
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post #1 of 10 (permalink) Old 06-19-2017, 05:52 PM Thread Starter
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How to adjust throttle body air screws

I assume one cylinder is used as a base line then the other two are adjusted to that cyclinder.
Which cyclinder are the other two adjusted to match? I assume cylinder #1.
Is the air screw set a certain amount out on the base line cylinder such as 1/2 turn?
Thanks
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post #2 of 10 (permalink) Old 06-19-2017, 07:30 PM
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Left most is monitored by ECU. I would get that in spec and match middle and right around it. The range is 0-1 turns out according to MV USA for stock bike.
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post #3 of 10 (permalink) Old 06-19-2017, 08:05 PM Thread Starter
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Excellent.

Thank you.
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post #4 of 10 (permalink) Old 06-21-2017, 09:42 PM Thread Starter
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I got it done, what a pita! My Aprilias are much easier.
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post #5 of 10 (permalink) Old 06-22-2017, 07:36 PM
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What were the positions like from factory and what did you end with?
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post #6 of 10 (permalink) Old 06-23-2017, 05:55 PM Thread Starter
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#1 was closed, 2 was at about 1/2 and 3 at about 1/4.
I set #1 at 1/2. I'm not sure where 2 and 3 ended up but 3/4 or less. I was too focused on getting it done. I probably should have written it down.
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post #7 of 10 (permalink) Old 06-24-2017, 07:49 AM
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@Banned: that seems like the common factory set up. How does the bike run now?

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post #8 of 10 (permalink) Old 06-24-2017, 04:26 PM Thread Starter
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It runs much smoother now at lower rpm. Not perfect, but much better. I knew going in when I bought the bike that fueling would be an issue so any improvement is welcome.
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post #9 of 10 (permalink) Old 06-26-2017, 01:31 PM
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No one in Italy cares about what the bike does at idle! I wonder if the screws are adjusted based on bench flow? I guess no matter what as the bike breaks in those screws need adjusting anyway. Thanks for the info @Banned
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post #10 of 10 (permalink) Old 06-26-2017, 01:47 PM
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My Rivale stalled. A lot. New map didn't help. The #1 air screw was closed. Fixed the stalling issue when my technician balanced them. Per another member's suggestion and a little research, it was apparently the practice of a couple of manufacturers to close the #1 for emissions testing purposes. Not sure if that is what MV was trying to accomplish, but the technician said he had never seen one closed like that, from the factory.

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