Members who have donated towards server costs
Join Date: Jun 2006
Location: Corpus Christi, Texas
The vacuum port on the front carb should be connected to your petcock so fuel will flow to the carbs once the engine starts. For the carb sync you will need to find an alternate vacuum source so your bike will stay running while you have the monometer hooked up.
The rear vacuum port is hooked to the EGR system and that can be removed and plugged temporarily while the manometer is hooked up.
Both vacuum ports are already connected to something so it is just a matter of disconnecting the hoses and then reconnecting once you are finished.
For the oil not to be sucked up into the carbs, both vacuum ports have to be connected to the manometer at the same time. You adjust the sync screw until both sides of the manometer are of equal height. You will probably have to shut down the engine in order to reach the screw to make the adjustment and then restart. Hence the need for an alternate vacuum source so you don't run the carbs dry. I use a hypodermic syringe hooked to the line with the plunger pulled out to create enough vacuum for the petcock to stay open.
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08