Major differences when syncing carbs at various RPMs

[UncleMike]

I like beer ok, but there is only one beer I like.
Earl

And it's made about 30mins from me!

[49er]

Earl
I told you that my Morgan Carbtune wasn't for sale. And when you borrowed it I said, be careful not to loose the mercury.:-D
Cheers.

[earlfor]

The Morgan is the Cat's meow for carb work. Use one once and you'll never go back. :-) I didnt lose the mercury, I took it out and put it in the fish tank. BTW, anyone know how much fish food to feed per day for a couple of 9 foot goldfish?

Earl

Earl
I told you that my Morgan Carbtune wasn't for sale. And when you borrowed it I said, be careful not to loose the mercury.:-D
Cheers.

[UncleMike]

The Morgan is the Cat's meow for carb work. Use one once and you'll never go back. :-) I didnt lose the mercury, I took it out and put it in the fish tank. BTW, anyone know how much fish food to feed per day for a couple of 9 foot goldfish?

Earl

As much as they want!

[Road_Clam]

I drink beer, but I have noticed my hard liquor intake has increased since I started working on my bike......

I know the feeling...... I restored a GS1100E, and in the process became an alcaholic. Oh well, I do have a nice bike.......

[t3rmin]

The Morgan is the Cat's meow for carb work. Use one once and you'll never go back. :-)
Earl

To the completely Morgan uninitiated, it seems like it'd take lots of time to put it in, adjust, put it in the other cyls, check for balance, lather, rinse, repeat. Do you use it for balancing or just jetting or what? Or do you do a vacuum balance and throw in the carbtune to check it afterward? In other words, gimme a little overview of how you personally use the thing. I'm curious now. ;-)

[49er]

Morgan is an Irish company who as Earl rightly points out, make an extremely good carb syncing tool. They make Carbtunes for engines up to six cylinders.
Their design is similar to the suzuki model that was available when our GS's first appeared. The difference is that they use stainless steel rods instead of a balls in their indicator tubes and they don't need to be re-calibrated each time you use them.
Morgan's instructions advise doing the sync at the manufacturer's suggested rpm, in the 850's case 1500-2000rpm (Clymer 1979-1984 GS850-1100). They also advise against doing syncs at higher rpms.
However, they have overlooked one valuable piece of advise. There is no recommended number of beers to be consumed during the syncing process.
Cheers

[UncleMike]

However, they have overlooked one valuable piece of advise. There is no recommended number of beers to be consumed during the syncing process.

The answer to this question is the same as to the universal question we all get asked:

Q - How many beers did you drink last night?
A - All of 'em.

[t3rmin]

Morgan is an Irish company who as Earl rightly points out, make an extremely good carb syncing tool. They make Carbtunes for engines up to six cylinders.
Their design is similar to the suzuki model that was available when our GS's first appeared. The difference is that they use stainless steel rods instead of a balls in their indicator tubes and they don't need to be re-calibrated each time you use them.
Morgan's instructions advise doing the sync at the manufacturer's suggested rpm, in the 850's case 1500-2000rpm (Clymer 1979-1984 GS850-1100). They also advise against doing syncs at higher rpms.
However, they have overlooked one valuable piece of advise. There is no recommended number of beers to be consumed during the syncing process.
Cheers

I think Earl is talking about the clear sparkplug thingy, no?

[49er]

No. He is talking about the vacuum indicating carburettor synchronising tool which you attach to the individual inlet tracks to synchronise your engines carburettors while the engine is running.:-D In the case of VM carbs, the slides are adjusted until all vacuum readings are equal, or within 2cm/Mg.

[t3rmin]

No. He is talking about the vacuum indicating carburettor synchronising tool which you attach to the individual inlet tracks to synchronise your engines carburettors while the engine is running.:-D In the case of VM carbs, the slides are adjusted until all vacuum readings are equal, or within 2cm/Mg.

Oh, duh. I was confusing that with the COLORtune. ;-) Never mind!

[Nessism]

No. He is talking about the vacuum indicating carburettor synchronising tool which you attach to the individual inlet tracks to synchronise your engines carburettors while the engine is running.:-D In the case of VM carbs, the slides are adjusted until all vacuum readings are equal, or within 2cm/Mg.

I thought the center two cylinders are supose to be sync'ed with a slightly lower vacuum level?

[txironhead]

I know the feeling...... I restored a GS1100E, and in the process became an alcaholic. Oh well, I do have a nice bike.......

I am NOT an alchoholic, I'm a drunk. Alchoholics go to meetings......<hic>

Whar's tha damn wrhench? It was here a minnit ago.......\\/

[UncleMike]

I am NOT an alchoholic, I'm a drunk. Alchoholics go to meetings......<hic>

Whar's tha damn wrhench? It was here a minnit ago.......\\/

AA is for quitters.

[49er]

Hey you drunks, the man's asked a sober question.
The CV carbs on engines of 1980 vintage onwards have the vacuum on 2 & 3 carbs slightly lower than for 1 & 4.
Because there is no throttle valve adjustment screw on #3 carb, all the others need to be synced to this one. I don't know why the middle carbs are different to the outer ones but suspect that the slightly richer fuel mixture would help to keep those cylinders running at similar temperatures as 1 & 4 where more direct airflow is available for cooling.
My 850 definately runs hotter on the inboad cylinders, as was confirmed by the browner oil discolouration marks adjacent to the exhaust valve bucket galleys.
The VM carbs on 79 engines are synced equally.