Carb PSI Settings (EMGO carb synchro)

[Nessism]

If those gauges have readings based on "hg" then there is mercury in it. If i'm not mistaken (i'll be corrected if I am) the pressure going thru those tubes pushes the mercury which in turn is moving the needles in the gauges. As Steve has mentioned, don't get caught up with actual numbers of measurement just make sure the needles are pointing in the same direction.

There is no mercury in those gauges. Inches of Mercury is a common pressure measurement unit based on old style gauges that used actual mercury, like our sync gauges.

[Steve]

I will be doing this project once I do my valve clearances. Prolly this weekend.

I see you are going to do your valve clearances. Good to do them before the carb sync.

Be sure to see the last line in my sig.

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[SqDancerLynn1]

Thanks guys,

This is the gauge that I bought. I though I ordered the Motion Pro Mercury gauge but this is what came in. Im sure I can do the same thing with this gauge. See attached

I would send them back, tell them it is not what you ordered. Get the Motion Pro. I have the vac gauges and they are very difficult to use, as in it is very hard to get a steady reading without the needles bouncing all over
With the older slid carbs you can get pretty close doing a MECHANICAL Sync
All of the adjustments are based on the #3 carb
Back the idle screw out until you can see the #3 slide close, if it doesn't ? adjust it. Then adjust the idle screw in until you can insert a 1/8 dril bit under the slide from the intake side and adjust 1,2,4 to match. Don't for get to back the idle screw out before you start the bike

[Steve]

I have seen that suggestion before, but have had problems getting the idle speed screw to open the carbs far enough to put a 1/8" drill bit in. I have even had problems getting a 1/16" bit in at times. I have since resorted to just using my eyeball and adjusting the size of the sliver of light under the slide on VM carbs or the butterfly on the BS carbs.



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