Airbox elimination, vacuum line question

[Jaxx79]

I am going to run without the airbox and just go with pod filters.

What do I do with the vacuum lines?

Thanks,
Jack
79 XS1100

[TopCatGr58]

Hey Jack,

The lines on the top of the carbs are not vacuum lines, they are merely vent lines, but need to be vented, NOT CAPPED OFF. You can put them into a "T", and then put an air filter on the end of the one hose to keep trash from getting in, just suspend it up above the carbs somewhere!

Aside from your Indy Filters, are you running STOCK Exhausts, or aftermarket? You will probably need to change your jets with one or both mods...check out the tech tips on carbs, and jetting!
T.C.

[Jaxx79]

more stuff

TC

Any idea what to do with the vaccum advance line? Plug it off and leave it advanced all the time?

I am running more of an open drag exhaust so I know a jet kit will be in order, but it looks like I have a problem. Someone with heavy hands has been in the carbs before, and the slot in the pilot jet in carb #3 is destroyed. I can't get it out.

Any ideas?

Thanks
Jack

[TopCatGr58]

Hey Jack,

The vacuum advance line is supposed to be plugged into the small port on the #2 carb body....NOT THE INTAKE MANIFOLD, so if it wasn't there, that could contribute to reduced performance. The vacuummodule is both an advance and retard unit dependent upon engine vacuum and load values, so you definitely don't want to plug it off!

With that pilot jet, can you still see the opening in the head of it, in other words, can fuel still get thru it?! I had similar problem with my carbs on my 81SH, so...I left it alone, and it was plenty large enough with the ability to turn out the pilot SCREWS on the front top of the carbs...was still able to enrichen the pilot circuit plenty. SO much so that it was too rich while running in the mountains during rallies, had to actually turn them back in/lean a bit to keep my low end response.

But if you are set on removing it, you will need to try soaking it with some type of penetrating fluid(P.B. Blaster), and then get a reverse small drill bit, and gently drill it out, quite often the drilling process with the bit spinning in reverse will often loosen it and it will spin out with the bit!? IF not, then after drilling a small hole, you may be able to put an easy out/screw extractor in it and get it out.....ALL WITHOUT messing up the delicate aluminum threads!?

But with those pipes and Indy filters, you will then most likely want to go up about 3 sizes in the mains! Monitor your plugs afterwards for further size adjustments, per the tech tips!

HTH.
T.C.

[skids]

Re: more stuff

Hook up the ignition advance vacuum line to the nipple on No.2 carb. The lack of an airbox has nothing to do with it. I have not tried it, but I hear a left-handed drill bit with drill in reverse can unstick the pilot jet. I wouldn't drill it clear through the seat though. If that doesn't get it, an easy-out in the new hole might work.

Originally posted by Jaxx79
TC

Any idea what to do with the vaccum advance line? Plug it off and leave it advanced all the time?

I am running more of an open drag exhaust so I know a jet kit will be in order, but it looks like I have a problem. Someone with heavy hands has been in the carbs before, and the slot in the pilot jet in carb #3 is destroyed. I can't get it out.

Any ideas?

Thanks
Jack

[GNEPIG]

.. be very careful grasshopper if you brake off the drill bit or the easy out in that tinny hole your carb is finished
.. its best to just make sure the exsisting jet is open/flowing, and adjust with the air fuel screws... there will be more than enough adjustment with screws

..use the force luke [but not on the easy out]

[Chaluska]

One vacuum line goes into the carbs itself (a small T-coming off of the 1-2 carb intersection)

then one is a vent hose, sort of like a PCV on a automobile.. but.. there are no emissions on bikes.. so i say just cap it off with a small 1/2" filter... thats what im doing.

[Jaxx79]

Thanks

I just picked up some carbs with 140 mains and a set of 142 to go with it. Looks like the stock set will ride the bench for a while.

Thanks for the great tips and help.

Jack