synchronize Carbs 83 GL 1100

[JoBoy68]

In the tutorial on synchronizing Carbs, there is a link to the air nipple that threads into your manifold that link is dead I found ones at MotoPro ,
4 of Motion Pro Brass Vacuum Adapter With Cap (5mm x P0.80mm)
Sold by: Chrome World. it is a little deceptive the picture shows four for $7.85 if you read the whole description that price is for one item not a set of 4 so you have to order times 4

[dingdong]

Amazon has them. $8.49 for 4.
https://www.amazon.com/Motion-Pro-08-00 ... 6787443416

[JoBoy68]

I almost got the brass tubes you are showing from Amazon then I opted for the nipples I posted because the brass rods have a pinhole for the vacuum and I wanted the larger opening for the vacuum of a larger CC engine and they more closely resemble the ones in the tutorial

[OldguyGlen]

Just a side comment...
The size of the pin hole has no relationship to the CC size of the engine. The engine generates vacuum "pulses" with each opening of the intake valves. The vacuum needle dials, or fluid heights would flutter with these pulses and be impossible to read accurately by the naked eye. The pin hole, working in conjunction with the internal volume of the tubing creates a dampening effect. The resulting vacuum is averaged and presents a more stable reading. The larger magnitude of the pulse coming from a larger displacement engine might suggest the use of a smaller pin hole to better damp the fluctuations.
Actually I just looked at the specs. It does not state a pin hole size. One reviewer said the tube had 1mm wall, so that makes the ID about 3 mm or just under 1/8 ". Probably need to add a restrictor to dampen the readings. Some owners use aquarium tubing, and also get needle valves used to balance aquarium air supply. then just tweak the needle valves till the readings stabilize. The 0.8 mm spec is part of the thread definition (pitch)