carb issue still unsolved????

Alright, it has been a couple weeks now where I have been having the same problem. First of all I should probably mention that I removed the emmissions deal and capped the vacuum lines about a year ago. I first noticed the problem when my bike began to rev very slowly and had no get-up-and-go. Gas literally pours out of carb four (far-right). When I say pour out, I mean leaks out from the inlet and out the pod. I also noticed that the gas floods into the cylinder and unburnt fuel comes out of the exhaust. I have taken the carbs off SEVERAL times to troubleshoot but have acomplished nothing. Carbs seem to be very clean inside. Seems to be nothing holding the float needle up and its passage is clean also. I cannot think of anything else that would cause this. Could there be any way a float needle could go bad? Is there any other reason that could be causing this?

Also, I am kinda afraid that fuel is getting down into the crankcase, but have not checked or given it the sniff-test. Also, the bike doesnt even have to be running. I can just turn on the fuel and within a couple minutes the steady stream of fuel comes out carb 4.

Please help!!!

Just a thought Jordan,but is it possible that the float is catching on something when you reinstall the bowl?

How about the vent-hose,where do you have that routed?

Sandy wrote:

Just a thought Jordan,but is it possible that the float is catching on something when you reinstall the bowl?

How about the vent-hose,where do you have that routed?

Huh, never thought about that. There cant be much for the float to catch on, and it is only that carb everytime i reinstall them. I should also include that the bike rides like normal right away before the bowls have enough time to fill up. Also, I can shut off the gas and after some of the fuel gets used up it starts running good until it runs out of fuel.

vent tube? Is that the vacuum port deal on carb 4? I think it is capped off.

Check for a HOLE in that float. If it has a crack, it will sink and flood continuously.

Check the tip of the needle and mating seat for fit. Polish if needed to get a good seal.

If the float isn't sticking or leaking and the needle/seat interface looks okay, would also do the dry upsidedown float level measurement to help assure that the float level setting (tang adjustment) is at least in the ballpark. This could help rule out possibility of the float adjustment tang having somehow gotten so far out of whack as to be allowing such a high fuel level the needle never closes against the seat. In other words, the float in its highest uppermost position (when installed in the fully reassembled carb) might be failing to press the needle against the seat orifice.

And assure that the float adjustment tang actually still exists and hasn't broken off.

Would also assure the seat is not loose and is snugly tightened down.

Once overflow condition no longer occurs during bench testing, the tang may yet remain imperfectly adjusted. So would re-test (while carbs are still on the bench) using the clear plastic tube method (which method was impossible under the earlier overflowing conditions).

Good Luck!

jordan wrote:

vent tube? Is that the vacuum port deal on carb 4? I think it is capped off.

Well I don't know for sure,as I'm not too familiar with the vacuum style carbs,but I would look into that line that is "Capped off"...not sure that is should be capped.
If it IS in fact a "vent" line,then it should NOT be capped off.

On my 29's,I had the same issues because originally,I had the vent lines capped off,and I too was getting fuel seeping out of the pod end of the carbs.

Look into it.

from other posts I believe all of the vacuum ports should be capped. Yesterday I noticed that the vacuum plug on #3 (the one capped from factory) was cracked considerably. WOuld that cause this problem?

Also, the jets couldnt cause any of this problem could they?

jordan wrote:

...Gas literally pours out of carb four (far-right). When I say pour out, I mean leaks out from the inlet and out the pod...Carbs seem to be very clean inside...just turn on the fuel and within a couple minutes the steady stream of fuel comes out carb 4....

leaks out from the inlet -- please elaborate, being more specific. What inlet? Does this mean the inlet at the fuel pipe tee where the fuel line connects to carb?

steady stream of fuel comes out carb 4 -- from exactly where? Is any fuel coming from floatbowl overflow?
Fuel leaking past floatbowl gasket?
Cracked fuel line?
Loose fuel line fitting?
Cracked inline filter?

Pic?

Good Luck!

In my original post I stated that the fuel literally comes out of the inlet where the pod is. By pod I mean pod filter. No, the fuel does not leak out of the overflow that I could see, there was so much fuel i guess i only noticed it coming from the inlet. Also, all of the floats look brand new.

i took off the bowls and held the carbs so the floats could hang and didnt see any real differences. Just to try it I adjusted carb 4 quite a bit, so it closes earlier. Reassembled and went for a ride. Seems to ride just like it should. I am kinda worried about how much it was adjsuted. Is it possible that the spring inside the float needle was getting worn out. If so, im betting that is the culprit.

jordan wrote:

In my original post I stated that the fuel literally comes out of the inlet where the pod is. By pod I mean pod filter. No, the fuel does not leak out of the overflow that I could see, there was so much fuel i guess i only noticed it coming from the inlet. Also, all of the floats look brand new.

i took off the bowls and held the carbs so the floats could hang and didnt see any real differences. Just to try it I adjusted carb 4 quite a bit, so it closes earlier. Reassembled and went for a ride. Seems to ride just like it should. I am kinda worried about how much it was adjsuted. Is it possible that the spring inside the float needle was getting worn out. If so, im betting that is the culprit.

Thanks for clarifying.

Where overflow circuit operating correctly, fuel should not rise up into carb throat. But maybe overflow circuit was simply being overrun by volume of excess fuel admitted past needle into bowl (for whatever reason).

Would sniff-test crankcase oil for possible contamination by fuel intrusion.

kinda worried about how much it was adjusted -- clear plastic tube test will resolve doubt.

Am thinking spring in float needle isn't the issue.

Good Luck!

clear plastic tube test? sound interesting. Elaborate

And already changed the oil in fear of it containing fuel