My First TBS - lessons learned, tips offered - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 5 Old 04-21-2007, 09:16 PM Thread Starter
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My First TBS - lessons learned, tips offered

Today was major surgery day for my Wee. Among the items on the agenda, was the air filter which has never been checked/cleaned, so the tank had to come off. It made sense to try a TBS (Throttle Body Sync) as well. I thought I'd share some things I didn't know before I started. I hope they help someone out.

I built my manometer using ATF and clear vacuum tube. See http://tinyurl.com/22masc (VSRI FAQ) for more info.

Tip #1. A lot people have said it is difficiult to get the vacuum hoses onto the throttle bodies. I didn't find this to be the case with the tank off. The front vacuum nipple easily accessed from the right side of the bike. The rear is bit trickier but I was able to reach over from the right side and get my hand in to guide the hose on. I used 3/16" ID hose. I think it might be a hair too big. It went on way too easily. Cut two 12" lenghts of hose and put barbed couplers on the end. You can leave these attached so you can do a TBS any time. Use, the factory caps to cap the barbs when you're done. The tip is to not skip the tank removal step to install your hoses the first time.

Tip #2. You must let the engine warm up. Really warm up. I hooked my manometer up to the cold engine and it immediately started such the ATF into the front TB. I shut it down before it got there. That scared me. So, I re-read the instructions and it said to warm the engine. However, even after 3 bars appeared it still hoovered the ATF into the front TB (very fast I might add). "Hmmm it must be really out of whack", I thought. So, I turned the screw half a turn clockwise (lucky guess). It was marked with white paint, so I knew I could get back to where I started. This time it sucked in at front much more slowly. I gave it another half turn, then a full turn until it finally settled down 2 and half turns later.

However, as the engine really warmed up, it began to bias back towards the rear TB. Eventually I ended back to very close to the factory setting. So, let the engine warm up.

Tip #3. Tightening the screw (clockwise) biases towards the rear TB, i.e. it will make the ATF level lower on the front TB and higher on the rear.

Tip #4. For me, raising the RPMS with the throttle ever so slightly would bias towards the rear, while blipping the throttle would bias towards the front. You can use this to play with the current setting to make sure the levels return to even.

Tip #5. Mark your manometer for front and rear and hook up accordingly. Also mark what happens when you tighten the screw. You might not remember next time.

Tip #6. There really isn't much room under the tank to adjust the screw. Make sure you get a really short stubby screwdriver (note to Suzuki - how about a screw that could be adjusted with an Allen key?).

Tip #7. The rear cylinder gets really hot. Don't touch it.

Tip #8. Once you get close, very small movements of the screw can have great effect on the balance.

Tip #9. "The perfect is the enemy of the good". I spent two hours futzing with it. Even when you think it's dead on, a couple of throttle blips will cause one side to end up slightly higher. Blip again and it might reverse or get worse. The idle speed affects the balance as well. Give the levels time to settle before making the next adjustment.

Good luck and I hope this helps.

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post #2 of 5 Old 04-21-2007, 09:50 PM
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Same for me

Ditto on everything you did and said, Dude. My first TBS was a learning experience, too. My next one will go much smoother, I guarantee. Made my own manometer the same way. I also attached vacuum hose extensions to the throttle body nipples - quite handy. Everything worked well, once I figured out the little delay involved with making adjustments to the screw. Also noticed the warm idle adjustment to 1200-1300 rpms BEFORE the TBS is rather important.

I'm now cutting down and grinding some flats on an old #2 Phillips to grip with my 45 degree pliers for my next TBS, too. That oughta help out with my next adjustment in a few thousand miles. The bike does run much better, though. Very glad I invested the time in doing it.

The wheels on the bus go 'round and 'round . . .

2019 Yamaha Tracer 900 GT (Annabelle)
2013 Suzuki V-Strom DL650 (Juliette)
2013 Yamaha FJR 1300 (Rachel)
2008 Suzuki Bandit 1250S (Fiona)
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post #3 of 5 Old 04-21-2007, 09:53 PM
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Thanks for the advice. I have been considering a TBS for a while now. My bike surges a bit around 3000 rpms. I have never had my tank off, so this would be a good reason to do it.

Did you have a problem before the TBS, or did you just do it for fun? If a problem before, how is it now?

Thanks for the report.

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post #4 of 5 Old 04-21-2007, 10:05 PM
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Mine was part of my self-prepared 7,500 mile checkup, along with installing Pat Walsh bars and bash plate, an SW-Motech centerstand, cleaning the air filter, replacing plugs, and re-locating the Stebel horn.

Not hard to do, really. I would recommend attaching some hose extensions to the TB nipples and run them out the right side for easier future TBS hookups. Re-use the existing caps that are on the nipples to cap the extensions and just tie them out of the way with a zip tie after you're all done. Making your own manometer out of 3/16" I.D. hose, a piece of ripped plywood or 1" x 4" and some ATF is easy, too.

2019 Yamaha Tracer 900 GT (Annabelle)
2013 Suzuki V-Strom DL650 (Juliette)
2013 Yamaha FJR 1300 (Rachel)
2008 Suzuki Bandit 1250S (Fiona)
2006 Honda VFR800 (Jenny)
2005 Suzuki V-Strom DL650 (Hannah)
2003 Honda Shadow Sabre VT1100 (Veronica)
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post #5 of 5 Old 04-21-2007, 11:49 PM Thread Starter
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I did the TBS because I was going to pull the tank anyway to check the air filter. I also re-wired my heated grips because I didn't like the way I set them up initially. Having the fairing and tank off made that much easier.

I didn't have any performance issues. I just wanted to learn how to do the TBS.
I'll have to wait until tomorrow to see if there is any change in performance.

My bike is still somewhat disassembled. Tomorrow morning I'm going to see if I can find some smaller hose for the 12" sections I left on the bike. The ones I have on there make me nervous as I think they are bit on the loose side.

P.S. I put this in the wrong forum section. Is there a way to move it to the maintenance section?

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