TBS with Harmonizer

[bnschroder]

Operator error - one of the in-line dampers was missing, or rather, had not been put in the line. Always double check borrowed tools.


Sent from my iPad using Tapatalk

 

[Bug Dr.]

Thanks Fred for the video.

I'm glad I got a harmonizer a couple of years ago. Didn't know about Grok's passing. I think I need to sync my TBs on my new Tenere soon.
Mike

 

[Thrasherg]

Guys, I was reading this and watched the video (very nicely made and easy to follow), so all this is doing is ensuring the inlet manifolds are balanced at idle. How do we ensure that both throttle bodies are synced and opening the same amount at part and full throttle? This adjustment I believe is just changing the throttle stop for each butterfly flap, but once you start opening the throttle, one valve could be opening up immediately and the other one opening much later, surely it is important that both valves open at the same time and by the same amount? How is that checked and calibrated? Or is it just assumed that Yamaha put everything together perfectly and they must therefore match?
On my Rg500 there are dots on the throttle slides, you have to open the throttle until the dot on carb number 1 aligns with the top of the inlet tract, and you then adjust the throttle cable on the top of each other carb until the dots on all the other carbs match number 1, then the carbs are synced at part and full throttle opening. Each carb also has it's own idle stop screw and you use a similar technique to sync the carbs at idle. so based on my RG experience I wanted to ask how we sync the butterfliy valves at part and full throttle openings?

Regards Gary

 

[jbrown]

... This adjustment I believe is just changing the throttle stop for each butterfly flap, but once you start opening the throttle, one valve could be opening up immediately and the other one opening much later, surely it is important that both valves open at the same time and by the same amount? How is that checked and calibrated? Or is it just assumed that Yamaha put everything together perfectly and they must therefore match?
...
Regards Gary

On the S10, you are just changing an air bleed adjustment. The throttle bodies share a single shaft and there is no mechanical synchronization of the butterfly valves possible. When I adjust mine at idle they are not nearly as well synched while cruising at 50 MPH. If I adjust them to match very close at 50 (takes a very large adjustment!), they are way off at idle. So I consider this a low speed adjustment. But some have seen a significant decrease in vibes after an adjustment, so I assume they can sometimes be way off.

 

[RonH]

I snagged a Harmonizer on ebay for $77 that looks and functions like brand new and got the joy to try it out today. I had synced 1500 miles back using a Morgan Carbtune and it indicated the right throttle body screw needed to be turned out about 1/2 turn, so I went to check with the harmonizer and it showed about 17mb more vacuum on the left cylinder, so it took turning the screw on the right body back in 1/2 turn or so to set, so in other words it seems the sync was pretty darn close and probably the carbtune actually caused a slight error in settings. 17mb is not much though, so not a huge thing, but as Fred has said all along, you are not going to get 100% perfect using those old tools, but good enough to be close. I thought I would just convey my personal recommendation to get a Harmonizer if the opportunity presents itself. Talk of producing another similar tool, possibly even a 4 cylinder version has been seen over at ADVrider, but I think it is going to be a lengthy process, if it ever comes at all.

 

[fredz43]

Ron, you got the deal of the year, finding one for $77. Since they went out of production, they have been bringing incredible prices. Good on ya!

 

[Thrasherg]

Ron, I have to say, I really doubt the carb tune was out, the carb tune is just a steel rod in a tube (or the older ones where mercury in tubes) that is counter balanced by atmospheric pressure, they cant go out of adjustment as there is no adjustment they just depend on atmospheric pressure. The Harmonizer is an electronic gadget which can go out no matter how good the design. I would have to say that basic physics would indicate that the carbtune would be more accurate than the harmonizer, however as you mention you are looking at very small differences so it probably doesn't matter either way.

Regards Gary

 

[RonH]

I like the carbtune, as I had the newer mercury free carb stix from Motion Pro, and the carbtune beats those hands down. However, even though all 4 columns are metal rods and mechanical, they show slight differences in how they read. I made a 4 to 1 adapter so I can hook all 4 columns up to a single vacuum source,and when I do that all 4 columns are not "exactly" even in readings. They are very close, but not exact. I used them on my older super tenere and one cylinder was slightly low in reading vs the other, then I switched the 2 hoses and the lower reading swapped to the other cylinder, so at that point I knew it was in fact the tool, not the actual adjustments. The harmonizer, since it self caibrates every powerup, it seems very likely to work perfectly. Of course it's not a huge difference in adjustmet either way and I doubt I would ever notice the difference. I'm sure happy with the harmonizer in any case. Even if it doesn't in fact do a whole lot better than other methods, the ease of use is just wonderful. No more trying to hang stix from the bars ect.
Thanks again Fred for doing the video.

 

[TenereGUY]

The best thing I learned out of watching this is to replace my 5 mm Allen bolts with good quality hex heads as I had to remove my AltRider lower bars to get enough room to remove it. I had plenty of room to get a ratcheting box wrench in there! Good video.
Thanks.

Sent from my SM-N960U using Tapatalk