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 First time balancing throttle bodies - well that was easy!

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Clancy
Tiradritto
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Clancy

Posts : 324
Join date : 2016-02-09

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PostSubject: First time balancing throttle bodies - well that was easy!   First time balancing throttle bodies - well that was easy! Icon_minitime1Thu Oct 08, 2020 5:32 pm

During the last month I'd noticed that the bike was smelling a bit 'fuelly' while waiting at lights and pulling up to a stop so the other weekend I pulled the plugs.
The right hand one didn't look great.
(I replaced them both).


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Checked the valve gaps -
Right hand side inlets had closed up a little. Exhausts were still correct.
Left hand side inlets and exhaust were still correct.

TPS was reading 4.6.

I had ordered a Carbtune a little while ago but whilst I understand the process, sometimes I like to see something done once before diving in myself.
So I'd dithered and never done them.

Now I just got on with it.


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Followed Pete's instructions below and it really couldn't have been easier.
Bell crank adjuster needed a quarter turn clockwise.
Right throttle air bleed needed to be opened slightly.
TPS back to 4.8.

Went for a ride and all seems good.
Didn't notice any smells.
Need to do more miles but the heavens have opened this week.

Thanks for the easy to follow instructions Pete.

Pete Roper wrote:
you need a manometer of some sort. You'll also need some form of diagnostic device, (ie Guzzidiag.) to recalibrate the TPS after doing it.

Apart from this the procedure for all the W5AM equipped CARC bikes is identical and incredibly simple.

Firstly close both of the air bleeds on the throttle bodies. These are, in the 1100's in the outside of the throttle body underneath in one of the 'Tubes' cast into the body itself, I think its the rearward one but I don't have a bike handy right now. It needs a small, flat bladed screwdriver. On the 1200's it is a 5mm Allen key 'Tube' right on the inside of the TB facing down as well. Its a bit of bugger to get to but its not really a big deal.

Once these are closed  and you've removed the screws from the inlet manifolds or disconnected the suck hoses for the charcoal can on US bikes start the bike and warm it up. You can connect your scan tool/Guzzidiag while its warming up.

Once its above 60*C you can hold the throttle open so that the engine is spinning about 3,500-4,000 RPM and check the balance with your manometer. If the depression is unequal on both sides use the screw on the bell-crank adjuster on the LH TB, NOT the linkage rod to adjust the balance at that engine speed. Once it is balanced at 3.5-4.0K let it off the throttle and kill the engine.

Fire up Guzzidiag and connect. Go to the 'Measurements' page and check the TPS setting. If you have had to use the bell crank screw to balance at high speed the chances are the TPS will be out.

Choose 'Actors', follow the prompts and do a TPS re-set, then go back to 'Measurements' and the TPS reading should flick to 4.6 for an 1100/1200 2VPC bike and 4.8 for a 4VPC machine.

Re-start your engine and look at the manometer. Whichever side has the highest manifold depression use the air bleed on that side to lower it until both sides are running identically.

Disconnect everything and re-install the manifold plugs or reconnect the charcoal canister suck tubes.

Job done. It really is a delightfully simple procedure. Much, much easier than most carburettors!

Pete

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JohnA
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JohnA

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Join date : 2015-01-13
Age : 63

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PostSubject: Re: First time balancing throttle bodies - well that was easy!   First time balancing throttle bodies - well that was easy! Icon_minitime1Fri Oct 09, 2020 3:48 am

Did the same as you Clancy a few months back. First time too. Had to get Guzzi diag going and then bought the Carbtune a well. With help from Pete and Beetle it all came together. It’s good because there is no shop near me. This site and ghetto members are invaluable.
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Clancy
Tiradritto
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Clancy

Posts : 324
Join date : 2016-02-09

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PostSubject: Re: First time balancing throttle bodies - well that was easy!   First time balancing throttle bodies - well that was easy! Icon_minitime1Fri Oct 09, 2020 5:02 am

JohnA wrote:
Did the same as you Clancy a few months back. First time too. Had to get Guzzi diag going and then bought the Carbtune a well. With help from Pete and Beetle it all came together. It’s good because there is no shop near me. This site and ghetto members are invaluable.

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