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

[jajpko]

Best diameter for connecting with Yamaha line and harmonizer? ( 1/8, 7/64, or 5/32)

It sounds like you may be cutting your stock vacuum line. If you want to put that back to stock, it will cost you about 9 bucks..

If you know a tech at your shop, ask them for a 4" piece of 1/8" fuel line. Buy a 1/8 x1/8 x5/32 vacuum tee. Use the two 1/8" to connect to the left throttle body and sensor with the tee between and the 5/32" for the Harmonizer. I also removed the oem vacuum cap on the right throttle body and replaced that with a 1/8" vacuum cap. This setup works well, however you may wish to use something else that would work just as well..

 

[switchback]

Thanks Jim, just what i needed.

 

[pqsqac]

I have a question for the folks that have done the TB sync. What is the technique for keeping the gas tank flowing fuel while you access the adj screws with your meter hooked up? did you just slide the tank from one side to the other when making adjustments to the screws?

 

[tomatocity]

I have a question for the folks that have done the TB sync. What is the technique for keeping the gas tank flowing fuel while you access the adj screws with your meter hooked up? did you just slide the tank from one side to the other when making adjustments to the screws?

Remove the two forward bolts and tilt the fuel tank up. I use a welding rod holder tube between the handlebars and fuel tank as a brace. You could use a bungy to pull it back.

 

[pqsqac]

Remove the two forward bolts and tilt the fuel tank up. I use a welding rod holder tube between the handlebars and fuel tank as a brace. You could use a bungy to pull it back.

Thanks so much Tomato City appreciate the quick response

 

[Kestrel]

What are you all using to sync now that the Harmonizer is off the market? Just whatever carb sync tools you can find?

 

[Dallara]

What are you all using to sync now that the Harmonizer is off the market? Just whatever carb sync tools you can find?

I've got a Twin-Max I'll sell for $75...

Dallara


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[Kestrel]

I've got a Twin-Max I'll sell for $75...

I guess that answers the question I actually have an old TwinMax - hasn't been used in ages, but if it'll do the job for the TB Sync, then I'm good to go as long as it still works. Thanks for the offer though.

 

[Dallara]

I guess that answers the question I actually have an old TwinMax - hasn't been used in ages, but if it'll do the job for the TB Sync, then I'm good to go as long as it still works. Thanks for the offer though.

Hey, I got *TWO* Harmonizers... That's why I wanna' sell the Twin-Max!

I got the Twin-Max years ago, and it works OK... I used it on my BMW a bunch, and on an earlier Versys I had and my ol' Hypermotard, along with some others. But I gotta' say, it's not nearly as easy to use, nor nearly as repeatable, as the "Harmonizer". That's why I snapped up a second "Harmonizer" once it became clear it might be a long, long time - if ever - that Grok ever started making 'em again. The "Harmonizer" is that good. I'm really sorry he quit making 'em, and especially sorry he never got his four-cylinder model finished.

Anyway, my offer still stands... If anybody wants a nice, well kept, in perfect shape Twin-Max I've got one for sale! ::008::

However, the Twin-Max you have will do the job, no problem.

Dallara



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[pqsqac]

TB sync was a piece of cake to do. The biggest pain was the tank vent hoses coming undone and not being able to grab them to hook them back up. ::010:: I ended up with 3/4 turns CCW out on the white screw which was my left side. I started with 3/4 turn out CCW on my right side screw then had to turn another 3/4 CCW to get the sync in. Bike runs great now although I had an unexplained stall when first starting the bike and had to do a WOT to get it started again. It ran great after that. The bike does act differently and throttle response off idle is powerful.

For a sync tool I used my old carb tune tool and it worked great. You could even make your own out of clear tubing a yard stick and some oil. You don't need a true throttle body sync tool do you?

 

[Checkswrecks]

Folks, it's a TWIN cylinder.
Keep everything perfectly matched for the 2 sides and just use 20 ft of vinyl tube with some coolant.
The tubing is marked at the exact center with a magic marker, then run to barbs off each throttle body in this photo.
That amount of vinyl has enough elasticity that the water level hardly bounces.

 

[tomatocity]

Folks, it's a TWIN cylinder.
Keep everything perfectly matched for the 2 sides and just use 20 ft of vinyl tube with some coolant.
The tubing is marked at the exact center with a magic marker, then run to barbs off each throttle body in this photo.
That amount of vinyl has enough elasticity that the water level hardly bounces.

I like your idea. I made a manometer for my DL1000 and used ATF for the media. IMO the ATF is heavier, moves slower, and is easier to see. The DL1000 was a PITA to sync since it would jump to an extreme. One of the reasons I do not have a DL1000.

The Harmonizer is much easier to use and stores well. Plus if you want to take it camping it can be used as a flashlight and beacon.

 

[BWC]

Just did a check of the TBS yesterday. This was before adjustment.
Bike has now just over 30,000 km. Using a set of 4 vacum gauges I use on my 4 cylinder bike. I don't know how accurate they are, I would hope by useing the same two gauges each time on the Tenere they would at least be consistent.

This after adjustment. Not much change. Right airscrew painted white (#2 cyl.) has been set to 3/4 turn out and left airscrew set to bring into balance. I checked the TBS at 15,000 Km and adjusted the CO at +5, and engine seems to idle well with no stumbling. Plan on doing a valve check this winter just to see how things are holding up.
Also missed out on getting a Harmonizer : but so far the vacum gauges have worked well.

Found this 3/32 ID tubing at the auto parts store along with the T fitting. Its a tight fit, but dosen't seem to leak at all. I remove it when done, and now it takes about 15 minutes including removing the R&L fairings and raising the tank a bit for a TBS.

 

[Dallara]

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Just for the record...

I've used tube-type manometers and vacuum gauges both in the over 40 years I've been wrenching on motorsicles. In fact, I still have two separate "racks" of vacuum gauges leftover from my Honda dealer days. Used those (and still do with fours and sixes) on all of my twins along the way, too. Got a deal on a Twin-Max when I had my BMW R1150R, and used it exclusively with the Beemer just because I got used to it, and so it continued with my Tuono, Hypermotard, etc. Again, the vacuum gauges *AND* the Twin-Max work fine, as do tube-type manometers...

However, when I got the "Harmonizer" from Grok I entered a whole new world.

Can the other methods do as good a job? Probably, though I'm not sure any of them are as accurate. The most wonderful thing about the "Harmonizer" is the convenience and speed. Synching is sooooooooooooo bloody fast and effortless with it that the first couple of times you use it you can't really believe it. No mess. No muss. No fuss. No futzing. Nothing. Just plug in the hoses, turn it on, turn the screws, and your done. Damn near takes longer to talk about it than to do it. No oil, coolant, or other fluids to deal with. No need to measure hose length. No periodic calibration we used to do with the guages from time to time. No fiddling back and forth with knobs to set "sensitivity" like with the Twin-Max. No need to guess on the average "bounce". Nothing. Truly "Plug-N-Play" convenience.

Like I said, all the other methods work fine, but if you can ever get your hands on a "Harmonizer" and use it just once, your *HOOKED*!!! One of the best tools I have ever bought, period. ::008::

And yes, I have checked it, back-to-back, with a set of those calibrated gauges and I am thoroughly convinced the "Harmonizer" is more accurate, too.

Just my two centavos... YMMV.

Dallara



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[tpak]

So sell me one of them - you can only use one at a time time Dallara!

 

[Dallara]

So sell me one of them - you can only use one at a time time Dallara!

If Grok ever starts building 'em again, or he allows someone else to do so under license, etc., then I'll gladly sell the second one... But until then I'll be keeping my eye out for even a 3rd one to buy used!!!

Dallara



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[JTWY]

Thanks Speedstar ,
Great write-up !!!

JT

 

[Kestrel]

Getting ready to do my first TBS - Do you need all the fittings (hose/T/clamps/barbs/caps) even if you don't plan on leaving anything attached to the TBs?

Thanks.

 

[fender5803]

::022::
I believe he is selling them again - maybe it was a limited run. I saw them two weeks ago on the market
best,
-DTz

 

[erenet]

You may need a 1/8 vacuum cap to replace the loose one on the right, go to your auto pars store, if you don't find it on the shelf ask for it at the counter, they may have them at the back. I looked everywhere for the 1/8 size and I couldn't find them until I went back to one of the stores (Canadian Tire) and asked the guy, he brought the case with all sizes.

If anyone in the aria needs a TBS done, just make an appointment at my garage, stock or modified and I'll let you watch or you can do it yourself.