Airscrew Adjustment to fix off-idle stumble and Throttle Body Sync - w/ pigtails

[Stoney]

Yes I did a 3/4 turn on the right (white) screw. Then backed it off a 1/8 turn. No change. I will check for leaks. Still better then it was. You should do it.

 

[rotortech71]

Yes I did a 3/4 turn on the right (white) screw. Then backed it off a 1/8 turn. No change. I will check for leaks. Still better then it was. You should do it.

I gave it a try last spring, but couldn't really feel a difference with 3/4 turn out on the painted screw. So I went back to factory setting, and did the sync per the manual. Had the ecu flashed a couple months later, and never looked back. Bike runs fantastic!

 

[carrot]

did a valve check new plugs and air filter last weekend but couldn't get the throttle bodies synchronized correctly without turning the white screw checked them again today with no luck decided to remove the steel rods in the carbtune and wipe them off after that they worked perfect just thought i would add this incase someone else runs into this.

 

[tomatocity]

did a valve check new plugs and air filter last weekend but couldn't get the throttle bodies synchronized correctly without turning the white screw checked them again today with no luck decided to remove the still rods in the carbtune and wipe them off after that they worked perfect just thought i would add this incase someone else runs into this.

Still Rods?

 

[Rasher]

Should this still be done with Flashed ECU's :question:

I am coming up for 12k so need to lift tank for service anyway, wondering if it is worth altering the Airscrew with the ECU-U Flash or is this going to upset their mappings :question:

My (probably wrong) assumption is this really only affects very slight throttle openings and may still have a positive effect on a Flashed machine, I assume this is the equivalent of the old air screws on Carbs where it just allows a tiny bit more fuel through and will make a noticeable increase to mixture at very small openings, but once the throttle is lifted more than a few % makes virtually no difference.

Wondered if it may further reduce the slight surging with my Arrow headers.

 

[carrot]

sorry about my post being confusing but im talking about the steel rods in my carbtune its the tool i use to adjust the throttle bodies if the steel rods get a little dirty they try to stick a little and give you a false reading

 

[p51super10bombay]

Without reading all 26 pages - I assume that the original instructions meant 3/4 out from fully seated as a starting point right?

 

[escapefjrtist]

Without reading all 26 pages - I assume that the original instructions meant 3/4 out from fully seated as a starting point right?

Yes, that's correct. Did this plus CO adjust on my '12 and it *seems* to have improved off-idle and low RPM behavior.

YMMV

--G

 

[Christoforos T.Pilitsis]

I see where one part of the tubes are attached on each side....
I'd like to see where the two other parts off the "T" and the other side of the single tube attach to on each side....could someone also show how it looks attached to a synchronizer so I know what to buy..and what to actually do.

 

[kmac]

Yes I did a 3/4 turn on the right (white) screw. Then backed it off a 1/8 turn. No change. I will check for leaks. Still better then it was. You should do it.

Unless I am misunderstanding the OP or you, I do not think what you state in this post is the correct process.
In the OP it says he turned BOTH left and right TB screws 3/4 of a turn or 270* out {to the left} and then to get them to sync on the manometer he needed to turn the left side TB screw back in to the right about 1/8th of a turn or 45* in.

The right stays set at the 3/4 turn out and the left is the one used to sync them to balanced.

As stated I may be misunderstanding something though.

 

[RIVA]

Having done the TBS and the CO adjust, I need to increase the idle speed slightly. I hate to admit it but I cannot find the adjust screw. The service manual gives a diagram but again I cannot make sense of it. Must be an age thing. If possible be gentle and make it simple ::005:: ::005::

 

[snakebitten]

Can you adjust idle mechanically? Thought it was all ECU.

 

[RIVA]

It shows a turn screw in the service manuasl but the diagram , to me at least, is not very clear

 

[jaeger22]

I am pretty sure Snake is right, there is no adjustment because it is controlled by the ECU. For the sync procedure the manual tells us to start it up and wait until the RPM gets to the correct range. I looked but as I expected I could not find anything about adjusting the idle speed in the manual. Either in the periodic maintenance section or the detailed dis-assembly of the TB section. Can you point to where what you are looking at is in the manual? It would be interesting to know about if we could adjust it.

 

[autoteach]

just to reiterate what others have said regarding the pigtails being left on the bike, if you are not using quality hose(rubber, multilayer), it will leak and you will get a check engine light on decel. It will come on at 3500 rpm and go off at 2500 rpm. Other than that, my TB sync was nearly dead on from the factory, so there is anecdotal evidence that everyone is wasting their time

 

[Reveille]

I finally ran a ground wire and bumped the co's to +3. Put on over 500 miles yesterday and it is running really smooth now. I pulled the CJM and the stumble is barely noticeable now. If I do a 2nd gear roll on and twist it pretty good I get a delayed surge which is actually quite fun if you are ready for it. The air fuel/screw and sync is next. Who has a meter near Illinois I can borrow? ::024::

 

[tomatocity]

Three of us sync'd TB's on Sunday. Always a nice feel to have a smooth throttle.

 

[fredz43]

I finally ran a ground wire and bumped the co's to +3. Put on over 500 miles yesterday and it is running really smooth now. I pulled the CJM and the stumble is barely noticeable now. If I do a 2nd gear roll on and twist it pretty good I get a delayed surge which is actually quite fun if you are ready for it. The air fuel/screw and sync is next. Who has a meter near Illinois I can borrow? ::024::

Well, I am in IL, but quite a bit south of northern IL. If you ever decide to take a ride about an hour south of Springfield, I'll do the TBS for you. Takes 15-30 minutes, depending on how much BS's ing we do.

 

[jaeger22]

I made a quick post on how to do your own cheap and easy TB sync tool. Should be right below this one for now but here is the link:
http://www.yamahasupertenere.com/index.php?topic=11622.msg190629;topicseen#new

 

[Reveille]

Well, I am in IL, but quite a bit south of northern IL. If you ever decide to take a ride about an hour south of Springfield, I'll do the TBS for you. Takes 15-30 minutes, depending on how much BS's ing we do.

I may just take you up on that. It takes me at least that long to pull the side covers and pull the tank. You must be fast. ::024:: Springfield is 2 hours so you would be a 3 hour ride I recon. I am in the Yorkville area.