Carb sync, whats your numbers?

[fudgie]

Adjusted my pilots again last night, 2 1/4 turns, and then synced the carbs. Only had to adjust 4 & 6. #4 plug seemed a little 'browner or red' then all the others. I adjusted mine to 8 in/Hg and was wonder what yours are adjusted to.

[Dag]

8 in/Hg is normal, but make sure the carburetor synchronization is within specification before pilot screw adjustment.

Be aware of that the -97 have other carbs than the other models and require other settings.

'97
Except California type : 1 3/4 turns out
California type: 2 turns out

After '97
Except California type: 2 1/4 turns out
California type: 2 3/8 turns out

The pilot screws are factory pre-set and no adjustment is necessary unless the pilot screws are replaced.

1. Turn the pilot screw clockwise until it seats lightly, then back it out to the specification given.
This is an initial setting prior to the final pilot screw adjustment.
2. Warm up the engine to operating temperature. Stop and go driving for 10 minutes is sufficient.
3. Start the engine and adjust the idle speed with the throttle stop screw. IDLE SPEED: 900+'100 rpm
4.Turn each pilot screw 1 /2 turn out from the initial setting.
5. If the engine speed increases bv 50 rpm or more, turn each pilot screw out by successive 1/2 turn increments
until englne speed does not increase.
6. Adjust the idle speed with the throttle stop screw.
7.Turn the No.1 carburetor pilot screw In until the engine speed drops by 50 rpm
8.Turn the No.1 carburetor pilot screw out to the final opening from the position obtained in step 8. FINAL OPENING: 1 turn out -
9. Adjust the idle speed with the throttle stop screw.
10.Perforrn steps 8, 9 and 10 for the No.2, 3, 4, 5 and 6 carburetor pilot screws

[FLATSIX]

Hello,

This is what I want to do for years in my Lady : adjusting pilot screws - but I don't dare because I am affraid that I will mess it up and finally cannot get it right anymore ...

The way Dag describes do I need a separate rpm-counter, or the drop of 50rpm can I read it on the original rpm-counter on the bike (or do you do it by hearing a drop in rpm)

I once tried to find a separate and sensitive rpm-counter here in Belgium - I searched everywhere but could not find one or extremely expensive and complicated machines that professional garages use).

My Fat Lady runs not bad, but I am sure that when pilots should be set at 100% + carb synchro that she will idel and pull better.

[Dag]

You will need a separate rpm-counter to get it 100%

[FLATSIX]

When I need a separate rpm-meter then I have a problem - cannot find it here?

Do you have a source in Europe where you can buy it at reasonable price?

[fudgie]

The pilot screws are factory pre-set and no adjustment is necessary unless the pilot screws are replaced.


Yea but for some reason, mine ran better when I did it last year.  ???

[fudgie]

You will need a separate rpm-counter to get it 100%

sounds like a lot of work!  How acurate is it doing it by a carb gauge?

[Dag]

I dont have a rpm counter. Its hard to see it drop with 50 rpm, so I would say you will need a separate rpm-counter to get it 100%.
The question is do it need to be 100% ?

I used my senses when I did this. My ears and intuition 

[Kingbee]

If you don't have a tach, do it by ear, if you can.  Turn one in until the RPMs drop a bit, then turn it out to max rpm.  Re-set idle speed if necessary and continue on the the remaining carbs.  For best performance, don't do the idle-drop step, that's just for emissions.
Synch the carbs first!

[Madmike]

Shouldn't the carb sync number be zero - indicating zero differential between the carbs and that they are in fact synchronized???

[FLATSIX]

What to do then for obtaining the best performance if the idle-drop procedure will not give this?

When you turn each screw 2.1/4 turn out without the motor running, then there must be a difference from carb to carb I guess - or not?

So the best is to perform the turning with running motor at 900 rpm and then adjust each screw to max. rpm - how much turns will this give approx.?

With this procedure will it be close to 100% you think - now the Lady runs good, but I think it will be better if pilots are set optimal for each carb - or not?

I hesitate before starting to turn at the machine.....