Throttle bodies

[Ratman]

Was asked by the dealer that works on my ride, why I always inquire about TB syncing, he said that they are pretty much at a fixed position once they are set?

I see a lot of talk about how often some of you work on this part of your bike.

Now I ride every chance I get ,so I do have over 50K on my 04. I have gone through several sets of tires and a lot of fuel, but he has not made a TB adjustment ever.

I do trust the mechanic he is Yamaha factory train five star gentlemen with a lot of oil and grease under his nails. I am some what confused by all the talk of TB sinking.

Then again I am confused easily.

I just ride a smile!!

 

[twowheelnut]

Sync 'em. Your tech don't know ****.

 

[Capt. Bob]

Was asked by the dealer that works on my ride, why I always inquire about TB syncing, he said that they are pretty much at a fixed position once they are set?I see a lot of talk about how often some of you work on this part of your bike.

Now I ride every chance I get ,so I do have over 50K on my 04. I have gone through several sets of tires and a lot of fuel, but he has not made a TB adjustment ever.

I do trust the mechanic he is Yamaha factory train five star gentlemen with a lot of oil and grease under his nails. I am some what confused by all the talk of TB sinking.

Then again I am confused easily.

I just ride a smile!!

I don't really know the tech details but it seems that if the TBs could not get out of sync, there would be no need for adjustment. If it's mechanical, it usually needs some sort of adjustment at some point in its life and with 4 cylinders, it's like having 4 different motors hooked together. As they age, I would think you need some type of adjustment to get them to function (pump air) the same. It is true however that the throttle body mechanisim does not displace a greater amount of fluid in relationship to its weight and therefore will "sink" whether or not a TBS is performed.

 

[adaniel]

The synch can gradually fade away and you may just get used to the way the bike is performing.

While the mechanic might be trying to do you a favor and not stick you with a charge he thinks is unnecessary, I would think that they would do it upon your request which appears to be repeated. Noting you have 50k, I would hope/think that at sometime the synch has been done.

I have oil/grease/dirt/cow-poo under my finger nails (no night at a Holiday-Inn Express) and wouldn’t have a clue as to all of the R&D and tear-downs that went into Yamaha assigning their recommended service schedule.

It is true that sometimes my plugs look fine after 8k, the oil isn’t all that dirty after 3k, and my TBS isn’t all that bad every 8k,…but I’m glad I did it.

 

[El Gordo]

It makes a difference and they do go out of synch with use. Neither my FJR or Barb's FZ6 were that close to each other or that close to spec right from the dealer. Do it yourself and take lots of time the 1st time or two. I have a squirrel cage fan I point at the rad and the engine heat stays at normal operating temp, so I can take my time and tweak til I'm happy.

The FZ6 saw a very noticable change to being less buzzy and the mileage increased. The FJR ran smoother. I like to do it every 5000 km.

 

[Pierre]

Sync 'em. Your tech don't know ****.

I like your answer

 

[charismaticmegafauna]

.....I just ride a smile!!

Prolly just fine....

If, however, you're a Left Coast "Sensative New-Age" FJR owner that drinks half-caff caramel machiatto lattes with your pinky extended -- there may never be too many TB synchs....?? :huh:

From the Mid-west, tho -- prolly just not 'sensative' enuff to matter....? :blink:

BTW, what does MamaYama recco in service intervals/procedures (for TB synch)?

 

[adaniel]

[bTW, what does MamaYama recco in service intervals/procedures (for TB synch)?

4,000 miles: Check and adjust engine idle speed and synchronization.

 

[charismaticmegafauna]

4,000 miles: Check and adjust engine idle speed and synchronization.

Thanx -- is that every 4K miles? Or, just after the first 4K?

'Ratman'..."so I do have over 50K on my 04. I have gone through several sets of tires and a lot of fuel, but he has not made a TB adjustment ever."

According to 'Verner' Heisenberg there may be some uncertainty to the principle....i.e., given enough miles (and 'Ratman' seems to qualify here) there may be an equal probability that TBs will go 'into synch' as often as they'll go 'out of synch'....??

Why woudn't they? If the adjustment moves -- then, given enough miles, it could all come into adjustment (at times), too.... :huh:

 

[adaniel]

Service/owner's manual notes the sync at the 600 mile service and then every 4,000 mile afterward.

 

[v65]

he said that they are pretty much at a fixed position once they are set?

The synch is done by screws. These screws are not torqued down, and are attached to a vibrating engine that heats and cools itself periodically. So you can expect some movement from them. In addition the state of tune of the bike will change over time, cylinders and other parts will wear in differently, plugs will change, etc. So there are lots of variables in the mix, but the short of it is that with time a throttle body synch is in order.

 

[markjenn]

My opinion is that 4K is probably a bit excessive and you could do it just on condition (i.e., adjust if the bike is idling roughly). You're not going to hurt your bike by not doing it - it just may not idle as smoothly as it can. And it's not likely it drift further and further out of sync. I liken it to piano tuning - something that is fine to do very often if you want the piano to sounds absolutely as good as it can, but not necessary if you simply want to have something to bang out a tune now and then.

What most don't realize is that all you're doing in the standard sync is adjusting the trim bleed air at idle to help get a smooth idle. While this trim is superimposed on the rest of the throttle range, it becomes essentially insignificant once you are above 1/4 throttle or so. According to Yamaha, the sync of the TB's butterflys (that affects sync big-time at all throttle settings) is fixed at the factory and never adjusted.

- Mark

 

[browndog]

Was asked by the dealer that works on my ride, why I always inquire about TB syncing, he said that they are pretty much at a fixed position once they are set?I see a lot of talk about how often some of you work on this part of your bike.

Now I ride every chance I get ,so I do have over 50K on my 04. I have gone through several sets of tires and a lot of fuel, but he has not made a TB adjustment ever.

I do trust the mechanic he is Yamaha factory train five star gentlemen with a lot of oil and grease under his nails. I am some what confused by all the talk of TB sinking.

Then again I am confused easily.

I just ride a smile!!

The bottom line here is that you have a 5 star mechanic that thinks he knows more than the gentlemen who designed this bike and wrote the service manual. Sounds like he needs to be promoted then, huh? :dribble:

Maybe he really is trying to save you money though.....do the sync, at least once. You won't become addicted I promise, everyone is doing it. It's the hip thing now, don't you want to be in with the in? B)

 

[Ratman]

Thanks every one ! If I would have had this much help in high school I wouldn’t have so many dumb questions.

I will question my mechanic when I pick my bike up in spring.

Now the explanation of why I don’t work on my bike.

Back when I was younger laying on my back in a snow bank working on my cars so one of them would get us to church on Sunday and to work in the mines on Monday , I swore if I ever get out of this place I wouldn’t lift a finger to repair anything.

I would just do the things I do and let other people do there thing. Works great most of the time and I don’t idle around very much ,it’s some thing I just hadn’t been affected by much, I guess.