78e carbs not fueling 3-4

[MrWheelie]

Air WILL still blow through the holes because they go back into the jets.

The tips break off where the fuel dumps from THAT passage into the venturie.

Were the needle ends blunt or sharp? A healthy idle screw is almost as sharp as a sewing needle.

yes, very sharp

[petejw]

could it possibly be a kink in the fuel line that feeds
3 and 4?

if you have the carbs off already, with the float bowls removed
and the carbys upside down, blow into the fuel inlet hose with ur mouth,
there should be no air leaks at the float, then slowly tilt the carbs
so the floats begin to open while still blowing into the fuel inlet hose,
you should now here and feel air pass thru the float valve, this will
tell you if you have any blockages.

[XSokieSPECIAL]

Make sure you have spark to those two cylinders and if you do, that the plug wires didn't accidentally get switched.

[MrWheelie]

could it possibly be a kink in the fuel line that feeds
3 and 4?

if you have the carbs off already, with the float bowls removed
and the carbys upside down, blow into the fuel inlet hose with ur mouth,
there should be no air leaks at the float, then slowly tilt the carbs
so the floats begin to open while still blowing into the fuel inlet hose,
you should now here and feel air pass thru the float valve, this will
tell you if you have any blockages.

no kinks, bowls are full.

[MrWheelie]

Make sure you have spark to those two cylinders and if you do, that the plug wires didn't accidentally get switched.

good spark, correct wires

[XSokieSPECIAL]

What kind of condition are your carb boots in and are they sealed to the head?

[XSokieSPECIAL]

Have you checked compression in those cyls?

[MrWheelie]

What kind of condition are your carb boots in and are they sealed to the head?

boots look ok, very minor wear showing, I can check them tomorrow

[MrWheelie]

Have you checked compression in those cyls?

not sure, I stuck my finger over the hole and turned over the motor, seemed to have normal compression

[petejw]

if you have spark, fuel in the bowls and
theres no blockages in the air filter, then it should fire,
is the bike running on the other 2 cylinders?
or is it just cranking over?
whats happening with the engine for you
to think that its not getting fuel?

[XSokieSPECIAL]

You got some really great XS techs there in the DFW area, maybe you can talk one of them into coming and take a look.

Just ask!

[MrWheelie]

if you have spark, fuel in the bowls and
theres no blockages in the air filter, then it should fire,
is the bike running on the other 2 cylinders?
or is it just cranking over?
whats happening with the engine for you
to think that its not getting fuel?

runs on two, 3-4 pipes are cold, I can rev it up and the 3-4 pipes warm up like its fueling on the main jet

[MrWheelie]

You got some really great XS techs there in the DFW area, maybe you can talk one of them into coming and take a look.

Just ask!

let me mess with the boots tomorrow, if no results I guess I can start begging for on site help lol

[petejw]

does it run on all 4 with the choke on?

the vent tube isnt blocked or anything(tho that would cause the carbs to flood)

was the bike running properly prior to the carbs being pulled down?

[MrWheelie]

does it run on all 4 with the choke on?

the vent tube isnt blocked or anything(tho that would cause the carbs to flood)

was the bike running properly prior to the carbs being pulled down?

carbs are not flooding, bike was running good 4 years ago, then it started acting up, been sitting since,