Balancing throttle bodies

[HansO]

If you adjust the throttle cables all move if you adjust the screw between 1 and 2 then 2 moves, if you adjust the screw between 2 and 3 then 3 moves. Have a closer look.

Sorry but you are wrong the number 2 is fixed to shaft, 1 and 3 move

 

[Al Carter]

Well, my Roadster runs perfectly, you carry on how you want, I'm only trying to help.

And I'm not wrong, check page 11.187 of the Triumph workshop manual

QUOTE

11. Start the engine.
Note:
• The rear adjuster will adjust cylinder 3 to
cylinder 2.
The front adjuster will adjust cylinders 2 and 3
to cylinder 1.
12. Set the adjusters such that all three cylinders have
equal vacuum readings.

UNQUOTE


I'm surprised, we all must be doing it correctly in the end or there would be a lot of badly running Rockets, I've never had any problem setting up multi engined bikes even all the triples I've had in the last 44 years.

Look at it as a pair rather than 3.

Number One throttle has the cables on and more importantly, is the one with the throttle stop, it moves when the twist grip is moved. If number 2 had a throttle stop on it then I would agree but it doesn't, it just hangs off the end of No !.

You adjust number 2 throttle to match number 1 as number 1 is the first one to move under the influence of the cables opening it. it doesn't matter which shaft the screw is attached to what matters is which throttle opens first.

If it was a single throttle body with no others then the one with the cable opens by itself.

Attach another throttle then the second one is worked by the shaft coming out of the first one with the cable moving it. It doesn't matter which shaft the screw is mounted on, because it's between one and 2 it changes the relationship between the pair. The one with the cable on has to be the master to which the other is adjusted because that is the one with the control on.

 

[Al Carter]

Fed up.

Just try it the way I mentioned and you will se waht I mean.

Bye

 

[hogweed]

So to get this right
number 1 cylinder is master
i adjust the front screw so cylinder 2 matches the master
then the rear screw to match 3 to master and 2

Correct?

 

[Triple Trouble]

Well, my Roadster runs perfectly, you carry on how you want, I'm only trying to help.

And I'm not wrong, check page 11.187 of the Triumph workshop manual

QUOTE

11. Start the engine.
Note:
• The rear adjuster will adjust cylinder 3 to
cylinder 2.
The front adjuster will adjust cylinders 2 and 3
to cylinder 1.
12. Set the adjusters such that all three cylinders have
equal vacuum readings.

UNQUOTE

You are not right either. As above the manual states to adjust cylinder 3 to cylinder 2. Then adjust cylinder 1 to cylinder 2. It all depends how you read it and the result is the same.

 

[mully95]

My manual that I have downloaded to my computer is the old version for Rockets and doesn't have a page 11.187
It shows balancing on page 11.121
Is there a newer one? I found the proper procedure in the manual I have and it doesn't show


11. Start the engine.
Note:
• The rear adjuster will adjust cylinder 3 to
cylinder 2.
The front adjuster will adjust cylinders 2 and 3
to cylinder 1.
12. Set the adjusters such that all three cylinders have
equal vacuum readings.

It states however the Rocket III can't be adjusted by using vacuum that it needs a diagnostic tool.

 

[Scuba Craig]

It states however the Rocket III can't be adjusted by using vacuum that it needs a diagnostic tool.

I have noticed that too.

Looking a bit further in to the Triumph manual it says the diagnostic tool "displays data taken from the manifold absolute pressure sensor reading for each throttle".

Now looking at the TuneECU manual, it states "the 3 small dials of the dashboard are active, providing the value of the vacuum intake (Manifold Absolute Pressure) of the corresponding cylinder (Keihin only)".

To me, that means TuneECU is using the same sensor info as the diagnostic tool and is ok to use for balancing. The warning in the Triumph book appears to be aimed at tools that use other measuring methods.

 

[HansO]

My manual that I have downloaded to my computer is the old version for Rockets and doesn't have a page 11.187
It shows balancing on page 11.121
Is there a newer one? I found the proper procedure in the manual I have and it doesn't show


11. Start the engine.
Note:
• The rear adjuster will adjust cylinder 3 to
cylinder 2.
The front adjuster will adjust cylinders 2 and 3
to cylinder 1.
12. Set the adjusters such that all three cylinders have
equal vacuum readings.

It states however the Rocket III can't be adjusted by using vacuum that it needs a diagnostic tool.

Mine is the same maybe they have changed the way the throttle shaft is connected in the newer bikes(Roadster) as I know if I adjust the front screw between #1 and #2 the butterfly in #1 moves not #2 and if i adjust the rear screw between #2 and #3 it moves the #3 butterfly and the reference to not being able to adjusted by using vacuum is because the old school multiple carby / cylinder bikes used to need a set of Vucuum Gauges to balance the carbies

 

[Neville Lush]

FFS just adjust the screws until they all read the same value............ it will then idle better and have better low end throttle response.

 

[Triple Trouble]

Mine is the same maybe they have changed the way the throttle shaft is connected in the newer bikes(Roadster) as I know if I adjust the front screw between #1 and #2 the butterfly in #1 moves not #2 and if i adjust the rear screw between #2 and #3 it moves the #3 butterfly and the reference to not being able to adjusted by using vacuum is because the old school multiple carby / cylinder bikes used to need a set of Vucuum Gauges to balance the carbies

I used my Mercury manometer to balance mine years ago and it really smoothed the bike out. Easier than watching numbers flicker about too