Help with TPS and balancing

[Detox]

With the help of various bits of advice posted on this forum I have completed a number of servicing tasks on my 1100.

Starting with oil/filter changes continuing through master cylinder and clutch replacement to this weekends fitting of Ohlins. The one task that I am hoping to master is TSP and throttle balancing. Not sure why but the procedure looks rather daunting, I’m OK with nuts bolts and spanners, but leccy stuff scares me.

Any GS gurus within easy reach of Bristol that are willing to “hand hold” me through the procedure in return for a generous donation of beer vouchers?

 

[ferguscawley]

Andy

Unfortunately, I am no where near Bristol, but balancing the throttle bodies really is very very easy. Don't be daunted by it in the least. If you can get someone to show you how to do it just once, you'll be away on a hack. Piece of cake.
Regarding the TPS, just measure the voltage from wire #1 (the red/white one) (+ve lead on there and negative lead of multimeter on the battery negative or a good chassis earth). It should be between 0.37 and .400 volts with the throttle closed.

I'm sure someone here will be able to help you out.

Ferg

PS - Just one thing to remember - make sure your valve clearances are correct before you attempt to balance the throttles or you will drive yourself mad wondering why the 'balance' keeps changing with rpm.

 

[The Mechanic]

Not a problem.

Don't be afraid to get stuck in, these thing are less complicated than a tractor.

The TPS is only a throttle potentometer, a bit like a variable light control in the living room; all thats needed is a good digital voltmeter and what the last reply said.

Try the Lentini w/shop manual, it is very clearly writtenand you will find all the relevant info and tips there. Sorry don't have the reference but try a search.

 

[The Mechanic]

Oh and this.

Forgot, you will need either a Twinmax or Carbtune, one of those or a very good set of vac. guages.

The Twinmax and the Carbtune cost about the same £50ish.

 

[Detox]

Re: Oh and this.

The Twinmax and the Carbtune cost about the same £50ish.

Ok, which one is the better bit of kit?

Still prefer to be shown how the first time.

 

[Guzzler]

I personally recommend a good old fashion carb stick, but the carbtune is the closest.

I hate the twinmax, I like things simple.

 

[Mick Fagan]

Andy, I would recommend that you print out Rob Lentini's article and read it through about 10 times. Then you hopefully will understand exactly what he is telling you.

Set aside a day for this and really take your time. The first thing to do is to set the valve clearances accurately. That done, put in some new spark plugs.

Step by step, start doing Rob Lentini's thing, it really is simple, but be accurate.

You will need a digital voltmeter. I had the use of a $250.00 one and checked it out against my radio parts one that cost $25.00 and they concurred, so from then on I have used the cheap one.

You will also need a machine to very accurately measure the throttle cables on the throttle bodies. I have used various units including good aftermarket vacuum gauges, a BMW vacuum gauge set-up designed for the motorcycles and a TwinMax.

I purchased a TwinMax as I figured that it was the simplest unit to use and also was the unit most unlikely to give an inaccurate measurement if used carefully. I have been extremely happy with that purchase.

The most important thing to remember is that the right throttle body knows nothing and is only a drone. The computer is set on the Left Throttle body and if your twistgrip has pulled the butterfly around to position 69 and the engine is doing 3,000 rpm and the temperature is 20ºC then it will give that cylinder x amount of petrol, each cycle of the engine.

The right throttle body could have the butterfly at position 73 but the onboard computer doesn't know this and gives that cylinder the same amount of fuel each cycle, which is x amount of fuel instead of y amount, this, more than anything else, is where most problems occur.

http://www.ibmwr.org/r-tech/oilheads/zero528.shtml

This link takes you to Rob's article.

Mick.

 

[MiGSel]

Hi Andy,

Here's a little manual for throttle body balancing that I made a while ago.

It's pretty simple really, just follow the steps

Cheers,
Michel

 

[Detox]

Can anyone recommend a supplier for a Twinmax or Carbtune.

How about a good value digital volt meter?

 

[MiGSel]

You can buy a Twinmax online here: www.selectronic.fr

Cheers,
Michel

 

[Frank Warner]

How about a good value digital volt meter?

I'm a long way from you but ..
You will want one with a 10 Amp range.. you don't need that for doing the TPS ... but if you get one without that 'feature' you'll regret it.

Cheap ones can be had.. around umm 12ukp should do. Nothing wrong with them .. the more expensive ones (over 150ukp) are better .. more rugged, accurate and more features .. but you 'd not know what to do with it so skip the expensive ones.

Shops .. umm do you have Tandy there? Most Electronics stores should have 'em.