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Carb synchronizing question on a 1979 GS750

  • Thread starter Thread starter oregonDave
  • Start date Start date
For the sake of discusion. A U type monometer reads 12" water column. Is marked from behind, at "0" half way up the U,and 1" thru 6" above and below. When reading, the sum of both sides are added. So basicaly it's only about 14" high. It would read either way, pressure or vaccum, if my old brain isn't failing me. These also could be mounted as a foursome as a gauge set. Calibration can be done by moving the measurement display or adding or subtracting the fluid in the gauge to zero it out at rest. You would eliminate the mercury. We use a 50 50 antifreeze mix, but anything that's a bit more consistant than water. Just a thought.

Stik
8)
 
Or you could "calibrate" by having excess tube length and allowing more or less length of tube to lay flat at the zero point. The principle also works well for finding two points 50 feet apart (or any distance) that are at exactly the same height. Its a lifesaver for building a deck all the way around your house and having the two ends join precisely in height. :-)

Earl

stiksave said:
Calibration can be done by moving the measurement display or adding or subtracting the fluid in the gauge to zero it out at rest. You would eliminate the mercury. We use a 50 50 antifreeze mix, but anything that's a bit more consistant than water. Just a thought.

Stik
8)
Click to expand...
 
Can one of the math geniuses convert cm to inches water column. I'm looking at magnihelic gauges that read inches water column. They can be set to read either pressure or vaccum. I told you I was stuborn. Cm stands for ? :roll:

Thanks,
Stiksave
 
cm is centimeter. 100 cm equals 1 meter. 1 meter equals 39.37 inches

1 cm equals .3937 inches

2.54cm equals 1 inch.

Earl


stiksave said:
Can one of the math geniuses convert cm to inches water column. I'm looking at magnihelic gauges that read inches water column. They can be set to read either pressure or vaccum. I told you I was stuborn. Cm stands for ? :roll:

Thanks,
Stiksave
Click to expand...
 
Home Made Manometer

Home Made Manometer

Here is a linke to one of many threads about home made twin carb/throttle body sync tools on a BMW site I frequent.

http://bmwsporttouring.com/ubbthrea...umber=464573&page=&view=&sb=5&o=&fpart=1&vc=1

Here is a link to a pricture of it:

http://www.rightspin.com/motorcycles/lowcostmano/mano.html

This thread also talks about a home made dial type guage.

I've not ever synch'd carbs this way but it would seem that you could sync carbs 1 & 2, then carbs 1 & 3, then carbs 1 & 4.

I think the cost of the home made guage is $7 for plastic tubing.


Frank
 
Thank you. Just did'nt know if cm was a secret vaccum term. So a 25 cm reading will equall approximately 10 inches. That was my concern with this type gauge as it ranges from a 20" model or 40" model. Needed to understand the perameters in order to see if this gauge would work in the carbs range.

Thanks,
Stiksave
:lol:
 
You got it. No secrets around here anyway. :-) :-)

arl

stiksave said:
Thank you. Just did'nt know if cm was a secret vaccum term. So a 25 cm reading will equall approximately 10 inches. That was my concern with this type gauge as it ranges from a 20" model or 40" model. Needed to understand the perameters in order to see if this gauge would work in the carbs range.

Thanks,
Stiksave
:lol:
Click to expand...
 
Once I have it together I'll share. It's a commercial grade gauge. I should have 4 of the darlins tommorrow. Just a matter of setting them to read vaccum and mounting them onto a stand.

"Cheap is Good, Free is Better"

Stiksave
 
Good going! Where there's a will, there's always a way. :-)

Earl


stiksave said:
Once I have it together I'll share. It's a commercial grade gauge. I should have 4 of the darlins tommorrow. Just a matter of setting them to read vaccum and mounting them onto a stand.

"Cheap is Good, Free is Better"

Stiksave
Click to expand...
 
If you look closely, there's a bottle of Capt. Morgans next to the copier that I add a shot to the toner cartridge to raise the octane. :lol:

Stik
 
:-) :-)

Earl

stiksave said:
If you look closely, there's a bottle of Capt. Morgans next to the copier that I add a shot to the toner cartridge to raise the octane. :lol:

Stik
Click to expand...
 
OK,

Since I'm almost to this part of my restoration project, and I have my vaccum set up ready. Where would I obtain, or what do I use for adapters at the intake manifold test holes? Is there a cheapo adapter out there? Just looking for a quick answer from a carb syncopro before I go on a quest for something that will work.

Thanks,
Chris
 
Go to cyclerecycle at http://www.crc2onlinecatalog.com/Index_Main_Frame.htm
Look under tools. Scroll down and you will see a set of four 5mm adapters for $15.95 These fit the manifolds on your bike.

Earl

stiksave said:
OK,

Since I'm almost to this part of my restoration project, and I have my vaccum set up ready. Where would I obtain, or what do I use for adapters at the intake manifold test holes? Is there a cheapo adapter out there? Just looking for a quick answer from a carb syncopro before I go on a quest for something that will work.

Thanks,
Chris
Click to expand...
 
It's actually on the cylinder head. Look on the head where the intake 'boots' from the carbs attach. There is a small allen head cap screw that you remove so you can screw in the adapter. #16 on the cylinder head schematic, but you can't see where it goes from that picture.

There's an article at http://bwringer.com/gs/index.html that has a good description and some pics. It's from a different model and slightly different carb, but the location of the screw is similar. The adjustment screw and lock nut is different - yours are under the top cap.
 
Thanks!

Does anyone know the dimensions of the O-ring that fits between the boot, and the well, I don't know the names of these things. Maybe I could pick it up at the local hardware store?

What is the dimension of the O-ring that fits on the back of the motor in the carburetor area?

It's over one inch in outer diameter, and under five furlongs inner diameter.

Oh, how I wish there was a manual for idiots like me. :roll:

-istp
 
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