Throttle plate balancing

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The Mechanic

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Just a little helpful tip if you are worried about or doubting the accuracy of the throttle plate balance.
You need to be in a nice quiet environment, shoot the neighbours and send the wife down the pub, all quiet now....good but youv'e got to be quick cos the fuzz will be wondering what the shooting was all about. Blues and two's 'Tony Blairing' down the road will upset your quiet atmosphere.
Now caress you darling's throttle (push the girlfriend out of the way this is serious stuff) gently open the throttle slightly (like you were accelerating on ice). Do this a few times to get the feel.
Now listen as you do this and you should be able to hear the throttle plates clicking on and off of their stops. With your finger pressed gently onto her soft and moist mound .....oh stop..oops sorry.... as you were.... finger pressed gently onto the throttle cable guides at the throttle body you will also be able to feel her body tense up with passion... oh bugger .... be able to feel the guides moving. Do this a few more times to get the 'feel'.
Now if everythings accurately set the clicks should be in unison (thats a good trade union to be in by the way) everything clicking away nicely, good; now relax. No you say the clicks don't sound balanced, well make a very tiny adjustment to the extremely complicated cable adjuster on the throttle body that seems/feels late. Try again now with the gentle throttle action and 'feel', until you are happy the balance/clicks are in unison.
This is not rocket science as some would have you believe, nor does it warrant the use of vacuum gauges although they are good, but this method puts you 'in touch with your loved one, and it realy works well if you are careful.
Just to put your minds at rest this is something we (collectively) in the trade used to carry out on Mercedes Benz (Bosch Injected) vehicles. Works just as well on most carb set ups as well.
 
When you hear a knock upon your door... it will be the rozzers in the club paying you a visit. There's a register for people like you, you know!!!!:yikes
 
Wot !

Next your be telling people to buy a length of tubing and stick one end in your ear and use the other end to listen to the bloody hiss.

LOL

Gezzas don't do it (unless you've got a set of gauges to put it right after. Mechanical syncronisasion and realtime vaccum are very different on BMW twins

:hapybnce:

G..... (Not a mechanic but a bit of a twidler)
 
Vacuum Real time

Yep, I did say this was for those GSer's that were worried. This is one way to balance / synchronise the throttle plates, presumably you would also synchronise the 'air bleed' idle screws before fitting on the vac guages. Myself I synchronise everything 'mechanically' then use the vac guages to arrive at a smooth tick-over/idle speed. I do not know anyone that rides around at idle speeds so I like to know that each cylinder is receiving the same volumetric air flow, this can only happen if both throttle plates are synchronised. The best piece of equipment for (technical) establishing the balanced air flow is an 'air flow meter'. This is placed over the individual throttle bodies (air filter hose off) and then fine trimming can be carried out. In practice the scenario I described to start with is never far out, by this I mean that for such a slow revving large pistoned engine like the boxer miniscule differences would hardly be noticeable to the un-trained 'eye'. So if you don't have the tools and want to check the balance, whats wrong with a little reassurance.
 
To the no name mechanic. I have been balancing BMW twins by eye and hand since my first BMW twin in 1968. From a 1954 R68 and lots of 500 and 600 twins with and without sidecars through to the /5 /6 /7 and then topping it off with a 1982 R100CS.

Then I bought my current mount, a 1998 R1100GS and the world was never the same. I came to the conclusion that one could service the bike and balance the throttle bodies by eye and feel, the operative word in this sentence is SERVICE.

However to make the bike far better and more rideable, I needed to tune the bike. This does require instruments and I eventually bought a TwinMax which made the beast go exactly as BMW originally intended.

I firmly believe that any of the 259 twins do require assistance of instruments to get them properly balanced for a genuine tune as opposed to a service.

I have followed your postings since you came on the site and I think that I would agree with everything you have said. You are succinct and with the hindsight of having read the question and then read your replies, I've come to the conclusion that you have a better understanding of mechanics than I will ever have. But in this case I don't think your method would really work.

I know as I used the tried and true method first, it was a disaster.

Mick.
 
Have to say that I agree.

Borrowed a multimeter, bought a Twinmax, the surging was really irritating me!

Checked the TPS voltage with the throttle stop screw fully backed off for zero voltage. Increased it to the recommended value with the throttle stop screw, then balanced the throttle bodies at idle and 2500 rpm with the Twinmax.

Different bike!

:beer:
 
Washing up

Oh well I'll go sit in the corner and clean me adjustable then!
Honest guv'nor I did say it was just a quick check not the definative way of doing it....honest. sniff ...
 
My Name

Mick Fagan said:
To the no name mechanic. I have been balancing BMW twins by eye and hand since my first BMW twin in 1968. From a 1954 R68 and lots of 500 and 600 twins with and without sidecars through to the /5 /6 /7 and then topping it off with a 1982 R100CS.

Then I bought my current mount, a 1998 R1100GS and the world was never the same. I came to the conclusion that one could service the bike and balance the throttle bodies by eye and feel, the operative word in this sentence is SERVICE.

However to make the bike far better and more rideable, I needed to tune the bike. This does require instruments and I eventually bought a TwinMax which made the beast go exactly as BMW originally intended.

I firmly believe that any of the 259 twins do require assistance of instruments to get them properly balanced for a genuine tune as opposed to a service.

I have followed your postings since you came on the site and I think that I would agree with everything you have said. You are succinct and with the hindsight of having read the question and then read your replies, I've come to the conclusion that you have a better understanding of mechanics than I will ever have. But in this case I don't think your method would really work.

I know as I used the tried and true method first, it was a disaster.

Mick.
Aw go on then Mick you can call me Tony.
 
To the mechanic. Don't give up!

The only reason I looked at this thread was because your name was on it.

I'm rather selective at what I view on this board and there are a couple of types of threads. One is mechanical/technical and some others are more of the chatty type.

I prefer the more mechanical technical type and I've found yours to be a breathe of fresh air, so keep it up.

Mick.
 


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