Carbs again??? Or still!!!

[GNEPIG]

.. ok Noeleo, i have found the solution to my cold start problem!
yee fukin hoo!!
i have been reading this thread from the start and it sounds just like thee same problem that i've been having with my bike right after i changed my float bowl gaskets ..
.. i put new gaskets on and this is how they looked when i took them out of the package

.. so i punched out the holes that i thought would work like this
.. i had starting problems ever since.. so tonight i was looking at what could be the problem again and noticed i had not removed the plug at the other end of the transfer port on the float bowl. low and behold this was my problem, it starts just like its supposed to cold now full choke no throttle

.. this all sounds pretty weenie but this might be your problem also.. if by chance you have removed this last plug already then make sure that the little hole in the carb above this hole is clear.. apparently this is some kind of a passage that conects to the little hole in the brass choke straw, maybe a vent
.. i hope this helps.. let us know

[Winterhawk]

LOLOLOL, Excellent.

Like Ken said, choke holes. 9 out of 10 times the hole is plugged in the float bowl. You can soak them all you want. Use ultrasonics and seafoam but they will not clear up. Use a single strand of SS wire from a cable and work at it until contact cleaner sprays through it. The punchout holes in the gskets need removed from the choke holes also. If it still won't start cold it has tight valves and low compression.

K&L carb cleaner wires work if your carefully not to break them.

[skids]

Take a look at this diagram. Mechanically, I don't know what the heck it actually does, but see "vent to bowl at mating surface":
http://home.earthlink.net/~sidskids/carbs/carbs.gif

make sure that the little hole in the carb above this hole is clear.. apparently this is some kind of a passage that conects to the little hole in the brass choke straw, maybe a vent
.. i hope this helps.. let us know

[pggg]

From what I can figure, the 10 o'clock inlet breather hole flows air to the tiny pinhole in the thin choke tube that acts as a breather to allow the starter circuit to flow the fuel. Same principle as the fuel tank breather.

[petejw]

That is one of the best pics ive
seen 4 the workings of these
carbies, ive had mine off so many times in the past cpl
of weeks ive lost count.

[skids]

That makes sense!

Originally posted by pggg
From what I can figure, the 10 o'clock inlet breather hole flows air to the tiny pinhole in the thin choke tube that acts as a breather to allow the starter circuit to flow the fuel. Same principle as the fuel tank breather.

[skids]

Thanks! I originally made the schematic for myself because I didn't want to have to blow air into all of the orifaces the NEXT time I went through the carbs again.

Originally posted by petejw
That is one of the best pics ive
seen 4 the workings of these
carbies, ive had mine off so many times in the past cpl
of weeks ive lost count.

[prometheus578]

Use a single strand of SS wire from a cable

K&L carb cleaner wires work if your carefully not to break them

Whilst you're out doin' your Cricksness Chopping next week, stop by a music store and pick up a pressinck for thyself. Get the three smallest sized diameter guitar strings; great for cleanin' carb passages. (Saw that tip on here somewhere) They're about 75 cents apiece.

[xs650mike]

Originally posted by prometheus578
Whilst you're out doin' your Cricksness Chopping next week, stop by a music store and pick up a pressinck for thyself. Get the three smallest sized diameter guitar strings; great for cleanin' carb passages. (Saw that tip on here somewhere) They're about 75 cents apiece.

When you cut off those guitar strings into handy lengths don't forget to dress the ends with a jeweler's file so you don't have sharp edges to slice up those passages in your carb bodies and jets. Guitar strings are tempered steel!

[GNEPIG]

.. ok, not that i like busting anyones stones or anything (except on 650 mike, i think he likes that) but in the first pics you see by the wire pulled through it that the 10 oclock hole just like the hole opposit of it is just a carb vent, i'm not real sure but i think these holes pull a vacuum on the float bowls to help bring the fuel down from the gas tank just like the vent hoses on the earlier
model carbs


.. from what we can tell from the next two pics the wire goes from that transfer passage on top of the float bowl to the top of the float chamber above the fuel level pointing towards the vent at 10 oclock. what this tells me is this passage helps draw fuel up the straw (puts a vacuum no the little hole at the top of the straw thats in line with the transfer passage) for the choke to use when there is not quite enough vacuum in the ventury to do the job, like on a cold start up.

[skids]

Yeah, that is different than the earlier carbs. I believe the gasket must be punched to allow air into the enrichener tube with either carb type.

Originally posted by GNEPIG
.. ok, not that i like busting anyones stones or anything (except on 650 mike, i think he likes that) but in the first pics you see by the wire pulled through it that the 10 oclock hole just like the hole opposit of it is just a carb vent, i'm not real sure but i think these holes pull a vacuum on the float bowls to help bring the fuel down from the gas tank just like the vent hoses on the earlier
model carbs

[xs650mike]

Originally posted by GNEPIG
.. ok, not that i like busting anyones stones or anything (except on 650 mike, i think he likes that) but in the first pics you see by the wire pulled through it that the 10 oclock hole just like the hole opposit of it is just a carb vent, i'm not real sure but i think these holes pull a vacuum on the float bowls to help bring the fuel down from the gas tank just like the vent hoses on the earlier model carbs...

I notice you're using a string wrapped with nickel wire there, that'll clean things well and safely.

[GNEPIG]

.. its the spring from the inside lip of an old wheel seal, fork seal, shift shaft seal something like that, i work at a cycle shop, these are free to me all day long

[xs650mike]

Oh.

[pggg]

Here's that breather circuit on the early type carbs.