#1 carburator

[shesseltine86]

I am not getting fuel to my # 1 cylinder, i am getting spark and i tried the drain on the bottom of the carb and the gas is there. Anything i can try other than taking the carbs off? The other 3 carbs are working great. I tried an additive and rode 250 miles, but it still isnt getting fuel.

[triton28]

If it were me, before I went to the trouble to remove the carbs I would hookup a set of carb vacuum gauges and run the engine to ensure that there is indeed a vacuum in #1 cylinder to draw the fuel into the engine. If there is NO vacuum, or very low vacuum, then I would do a compression check on #1 cylinder to determine the condition of the rings, valve seating, or both, as compression equals vacuum.
If there IS vacuum, I would suspect the diaphragm under the top chrome carb cover, or a blocked passage leading to the air chamber above the diaphragm. The jet needle controlled by the diaphragm will not raise if there is deterioration of the diaphragm, a hole in the diaphragm, or a blocked passage. If the jet needle doesn't raise to deliver more fuel above idle, the engine may idle fine but nothing above that rpm will be fueled.
While I haven't attempted this in the frame, there is access for a long phillips screwdriver to remove the diaphragm cover screws. Read the Fuel Section of the Service Manual before attempting, and be very gentle with the diaphragm.
If the cylinder doesn't even idle, then I would suspect there is a blockage of some form. It may be a blocked jet in the float bowl area.
Just some thoughts,
good luck,
Dave

[shesseltine86]

Thanks for the in depth response! I will pick up a vacuum gauge and check it out.

[Lucasind]

? By your description, when the bike is running and /or at idle...with the plastic OFF the bike, is the #1 exhaust header pipe cold to the touch ? just find this curious .

[shesseltine86]

? By your description, when the bike is running and /or at idle...with the plastic OFF the bike, is the #1 exhaust header pipe cold to the touch ? just find this curious .

Yes it is cold at idle and I checked it after a ride and it was colder than the others by at least half the temp. I also can feel the bike " lug" a little bit at low RPM under load( climbing a hil)

[shesseltine86]

I checked the diaphragm and it was good, around 8" of vacuum at idle, (#4 carb was the same)

[triton28]

So you have good vacuum from the combustion chamber, but a cold cylinder.
And the diaphragm appears soft and without rips/tears, so one would assume that it wants to work/is working.
And there was gas exiting the drain screw so one would assume there is fuel at the jets.
You mention you had spark at #1 so was this spark between the electrodes of the removed spark plug or from the plug wire/screwdriver in plug cap, to ground. If the spark was between the plug electrodes, one can assume the plug is working, albeit without a load.
Swap the #1 and #4 spark plugs and see if the problem moves to the #4 cylinder. If so, the #1 plug is defective. If no change, swap the #1 and #4 screw on spark plug caps to see if the problem moves to #4 cylinder. If it still is a #1 cylinder problem after swapping the caps, then the caps are good.
Unless I am missing something here, if you still have the problem after swapping around the plugs and caps, it sounds as though there is something amiss in the float bowl area of the #1 carburetor.
I remember Jim from north/south florida recommended in a reply to someone, leaving the drain screw open of the malfunctioning carburetor while running and revving the engine. According to Jim this will create turbulence in the float bowl area and may clear away small blockages. Not having tried it I can only suggest searching the posts for a similar topic as yours and find Jim's posting.
While it is not high on my list of favourite tasks, removing the carbs is not all that hard. Check the Tech Section at the AVA home page, there is a section on carb removal and replacement.
I hope there is a simpler solution than I have offered, and perhaps another member will chime in with an easier suggestion that may solve your problem.
Dave
edit: I incorrectly used the name Jim from north/south Florida when in fact it was Doug from north/south Florida.

[shesseltine86]

Thanks guys, got it straightened out last night, it was gummed up in the top of the bowl. Now its time to ride!!