Carb vacuum lines

Hello all I have a 1984 vf500f and bought another set of carbs that have no holes for the vacuum lines like my other set does. Where the vacuum lines would be there are only undrilled nubs. Would this cause a problem? This set has been run without the vacuum lines before by the previous owner so was just wondering. Thanks

 

PHOTOS needed.

 

Sounds like one set may be California and one set 49 state. But... as stated above... photos needed.

 

Hey ill get photos on here tonight after work, im alittle behind on time today. Thanks for all the help and input. Chris

 

Photos

first one with vacuum lines(old one) second without (new ones)

 

Should be OK......

 

Those are all ones that I've been able to cap off when testing. Probably related to cali emissions... I've found in testing I can cap everything but the bowl-vents, which are the plastic air-pipes between the 4 carb bodies (next to the plastic fuel lines).

 

Damn those things a clean.....could serve food on them.

 

Thanks for all the info wanted to be sure, this second set was ordered from the factory at some point as a replacement set and it went to scrap not long after so I was lucky enough to buy the carb set for 125 from a shop in amazing like new condition. Had some gumminess inside but clean in and out now. Chris

 

Those are not vacuum lines. They are float bowl vent lines.
You can just put them back through the air filter housing and that will solve all the problems.
You cannot have open vacuum lines o the carbs, they must be capped off or got to a device.

The most important question to ask yourself when hooking up emissions hoses is this....
What does the hose do? Then you can figure it out. Use your shop manual. Look at other systems etc.,.

For instance :

If it is a float bowl vent line (has to have one), you cannot cap it off or it would be like putting a thumb over a straw. The gas would not be able to get where it is supposed to go. See what I mean?

A float bowl vent should go above the carb or else it could siphon out the gas out of the float bowl or leak on acceleration.

 

I was looking at that on my bike, but ran into the question of how much vacuum in the airbox, and will that cause any issues with the filling of the float bowls? or will it just help the fuel pump move stuff along?

 

On the 49 state version of the VF1000R and F model the vent lines from the float bowls go into the air box and there is a sheet metal cover over the out let to keep fuel from getting sucked out of the float bowls. But on a hot day the fumes can vent into the air filter box. On start up the fumes will be eaten by the engine.

On the California model they send those fumes all the way back to the charcoal filter via a air control valve which closes on start up so you do not have a vacuum leak.
They also use that air control device to re circulate the oily fumes from the crank case.

Someday the manufactures will get their shift together and have one small unit that takes care of it and is very small. Not so many hoses going all over the place.
For instance they could hire me to advise them.

 

thanks, I'll look at the airbox port used for the air pump, and if it's protected, I'll route my vents there.