Removing vacuum advance

[LoftCol]

Hi,

Has anyone removed the vacuum advance and relied upon the mechanical advance. Google tells me that it is possible, but I really want to ask those who have done it. Why? I hear some of you ask. T he carbs do not have the vacuum port on them, so I am currently using the vacuum port on the inlet rubbers, which isn't ideal.
Thoughts/suggestions greatly appreciated.

Thanks

[jetmechmarty]

Hmmm…. I think without the vacuum advance you might enjoy 25 mpg. In a word, bye bye fuel economy.

This should eliminate the problem:

https://www.elektronik-sachse.de/shopsystem-3/en/digital-ignition-zdg-3-23-for-yamaha-xs1100.html

[LAB3]

Some time back I posted a complete XJ ignition setup that gets rid of the problem with the XS ignition wires breaking. It includes the TCI box, commutator, timing plate and vacuum sensor. $150 or reasonable offer, PM me if you want to know more.

[DEEBS11]

.....or you can keep what you have and activate the vac advance with the manifold port. However the vac signal needs to be attenuated. Some guys have mentioned using an aquarium air pump valve.

[DEEBS11]

..........

[DEEBS11]

Oh yea, ten bucks.

[LoftCol]

I tried the airline regulator, it wasn't accurate enough to fine tune the vacuum, I even added an inline fuel filter to act as a reservoir, that didn't work too well either. My next experiment is to add a idle jet into the line, I have seen some improvement with that. The dead spot is much smaller now. Thanks for the tip though

[DEEBS11]

This might help that issue.

[LoftCol]

Sorry if I am asking the obvious, but where would they go?
Thanks

[Schming]

Sorry if I am asking the obvious, but where would they go?
Thanks

Next to the vacuum port, if installed next to advance mechanism the vacuum might collapse the hose.