Throttle body sync - MVAgusta.net
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post #1 of 40 (permalink) Old 07-11-2015, 10:27 PM Thread Starter
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Throttle body sync

Hi guys, just repeating what a bunch of my fellow F3 owners have said about the throttle bodies. GET THEM SYNCHRONIZED! I had them remap and sync when changing my rear tire and the bike feels like a whole new machine. Throttle feels precise, the power delivery is carried better through the rpm range and there is no surging Jekyll and Hyde personality. I loved the bike before but this must be how the engineers at Mv intended the bike to run, amazing!
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post #2 of 40 (permalink) Old 07-13-2015, 07:27 AM
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Yep.
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post #3 of 40 (permalink) Old 07-16-2015, 05:11 PM
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Wink Sync?

MrTrogg;

there is 1 throttle shaft...... how would they get out of sync?

it was the remap!!





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post #4 of 40 (permalink) Old 07-16-2015, 05:26 PM
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The magic "throttle sync" on these bikes is actually pilot air screw adjustment across the throttle bodies.

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post #5 of 40 (permalink) Old 07-16-2015, 06:36 PM
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Wink ????

Quote:
Originally Posted by GREGOSTINI View Post
The magic "throttle sync" on these bikes is actually pilot air screw adjustment across the throttle bodies.
they are bypass air screws.........did they move??????

they have nothing to do with "pilot air screws" a mixture screw on carburetors

try syncing 6, 2 barrel Webers on a Ferrari........

1st you do the linkage witha feeler guage.......then the bypasses, then you play with

the mixture screws to see if you can raise the idle

twiddling on carbs since '59



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post #6 of 40 (permalink) Old 07-16-2015, 07:07 PM
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Quote:
Originally Posted by theknurl View Post
they are bypass air screws.........did they move??????

they have nothing to do with "pilot air screws" a mixture screw on carburetors

try syncing 6, 2 barrel Webers on a Ferrari........

1st you do the linkage witha feeler guage.......then the bypasses, then you play with

the mixture screws to see if you can raise the idle

twiddling on carbs since '59


Sorry for my incorrect wording, but EVERYONE on here who has had this done is talking about airscrew adjustment Noel.
Your ferrari carb story is just wonderful, but it has fuck all to do with this subject.
mwmke and mwmke like this.

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post #7 of 40 (permalink) Old 07-16-2015, 07:33 PM
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Wink

Quote:
Originally Posted by GREGOSTINI View Post
Sorry for my incorrect wording, but EVERYONE on here who has had this done is talking about airscrew adjustment Noel.
that ignorance is rampant on this and other forums isn't my fault is it?

if the blades are all on the same shaft......what changed?

if no one messed with the bypass screws whats to sync?

I showed Donsy my method at Bubba IV......he turned the screws for me

and it didn't require a TPS reset either

it was on Carl's SPR



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Last edited by theknurl; 07-16-2015 at 07:45 PM.
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post #8 of 40 (permalink) Old 07-16-2015, 08:59 PM
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Quote:
Originally Posted by theknurl View Post
that ignorance is rampant on this and other forums isn't my fault is it?

if the blades are all on the same shaft......what changed?

if no one messed with the bypass screws whats to sync?

I showed Donsy my method at Bubba IV......he turned the screws for me

and it didn't require a TPS reset either

it was on Carl's SPR









You are only responsible for your own ignorance Noel.
Is Carl's SPR an F3????
No, didn't think so. Once again you choose to cite the irrelevant.
The butterflies cannot be adjusted, correct. The air bleed screws don't move on their own either, but some F3s are coming out of the factory with closed airscrews.
http://www.mvagusta.net/forum/showth...ynchronization
See posts 17 thru 20.
Get it now???????

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post #9 of 40 (permalink) Old 07-17-2015, 11:09 AM
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Noel, I've always referred to them as throttle body airbleed screws. But who cares what term we use?

Bottom line is that my Rivale consistently stalled when rolling off (closing) the throttle with the clutch pulled in. Didn't matter what speed or what gear. Lots of threads in this section about this same issue.

Took it to the MV dealer who put on the (at the time) latest map, and it still stalled afterwards.

Then took the bike to my local independent Ducati/Aprilia/Moto Guzzi/MV Agusta technician who sync'd the throttle bodies via adjusting the airbleed screws. He said the screw on the #1 cylinder was completely closed, which he had never seen in all his years.

Once his sync'd it via the airbleed screws, it has never stalled since. Never.

I have since read that the #1 cylinder is the one that is "read" by the ECU, and further read that other manufacturers (Kawasaki, etc.) have been known to close that screw to pass emissions testing / certification. Don't really know if either of these things are true or not.

And I don't really care why my bike was delivered new with that airbleed screw closed, but my guess is that some bikes just won't function well with one throttle body airbleed screw closed and the other two open to different levels. As you know I'm not a technician, but just applying some lay logic here.

Anyway, there are several owners of three cylinder MV's on this forum with stalling issues who found the exact same thing - #1 cylinder airbleed screw completely closed, and the sync eliminated their stalling problems as well.

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post #10 of 40 (permalink) Old 07-17-2015, 01:46 PM
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Yep again. If you have the stalling this is the magic cure. Despite the dealer telling me that no 1 screw completely closed 'wasn't necessarily wrong'.

Me - Why hasn't it stalled once since I adjusted it then?

Dealer - errrrr.....
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