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Fuel out the exhaust #3 cylinder

  • Thread starter Thread starter Mark Crystal
  • Start date Start date
M

Mark Crystal

Guest
Ok. Ive cleaned the carbs, and used sea foam. Synchronized the carbs with the petcock vacuum to #3 before I did this there wasn't gas coming out the exhaust. I have the aftermarket pods. And I have not gotten. The stage 3 jet kit yet. Runs good besides that. Good compression. I'm stumped has anyone else had this issue
 
How about a bad petcock leaking fuel down vac line and fouling #3? block vac line off at petcock, run on "PR" and see what happens. Don't forget to put petcock back in "ON" or "RES"
 
Mark Crystal said:
Synchronized the carbs with the petcock vacuum to #3 before I did this ...
Click to expand...
Whoever taught you that little trick is probably responsible for the fuel out the #3 exhaust pipe.

But I do have to ask, ...
if you have stock exhaust, #3 and #4 exhaust pipes come together before going through the muffler.
If you have a header, all four pipes come together before going through the muffler.
How can you tell it's #3 that has the fuel in it? :-k

.
 
Hey, you know he's got 4 open pipes to match the pods. Good thing you didn't ask about his carb cleaning method!
 
Well I can tell its #3 because that pipe for that cylinder is cold the other three are hot. And I didn't have the gas issue till I connected the petcock vacuum line up. So maybe bad petcock? I'm headed home, going to change the plugs. And pinch the line off or completely remove it and re synch the carbs. I know I need a jet kit with the pods. What difference does the jet kit make?
 
Petcocks often fail like this (mine did), so be suspicious! You're waiting on a dynojet kit? What brand of pods? what kind of exhaust system?
 
tom203 said:
Hey, you know he's got 4 open pipes to match the pods.
Click to expand...
How could I possibly know that?

His only mention of 'exhaust' was in the title: "Fuel out the exhaust #3 cylinder."
For all I know, there is nothing connected and he's talking about the exhaust PORTS on the cylinder head. :p

.
 
Mark
As well as the things mentioned it could also be that when you reassembled the carbs, the Needle and seat (fuel valve) in the carb is "hanging up" which is flooding No.3. Also is there any chance you could have switched the fuel and vacuum lines to the petcock or at the carbs when you reconnected everything? What ever the problem is, the new jet kit will not fix it but you may see what the problem is when you install the jets. I've never heard of syncing carbs using the petcock vacuum so maybe you want to clarify this or give us a link or something to show us. Let us know how you go because I had a similar problem before I pulled the carbs off but haven't got a far as stripping down number 3.
 
I have fuel coming out 3/4, I still have that collection point on pipes. And, it uses tons of fuel.
 
just looked closer, there is fuel dripping from air pod on carb 3 (2nd in from throttle side). Any ideas why it would be doing this?

Vacuum petcock is stupid too, what a lame invention. Put an in line fuel shut off so I can take off tank without a bath.
 
"...air pod on carb 3 (2nd in from throttle side). Any ideas why it would be doing this?"

Do you have a stupid vacuum petcock line connected to #3 carb? VM carbs? maybe fuel is running down the vac line and overfilling that carb. In your case , sounds like your petcock has died.

P.S. I love my vacuum petcock but it does require changing after 30 years.
 
harshjay said:
Vacuum petcock is stupid too, what a lame invention. Put an in line fuel shut off so I can take off tank without a bath.
Click to expand...
Actually the vacuum petcock is a WONDERFUL invention.

It allows you to take off the tank without taking a bath, because it shuts the fuel off for you. :p

If yours does not turn off when you turn off the engine, it needs to be fixed or replaced.

.
 
Is it just me or did anyone else , catch that this thread was started by a Mark Crystal and ended with a Harshjay jumping in so we have mixed info to work with:confused:
 
hjfisk said:
Is it just me or did anyone else , catch that this thread was started by a Mark Crystal and ended with a Harshjay jumping in so we have mixed info to work with:confused:
Click to expand...

Lol, Multiple personalities? :eek:
 
Yea, very bad petcock. And the float tab was bent more then the other ones. And I'm needing new jets. Anyone have an idea of what size I should use? It has the stock jets. Also has individual air filters.
 
Mark Crystal said:
Yea, very bad petcock. And the float tab was bent more then the other ones. And I'm needing new jets. Anyone have an idea of what size I should use? It has the stock jets. Also has individual air filters.
Click to expand...
Can you see any brand name on these pods (some are apparently pitiful)? And what type of exhaust are you running? You'll have to increase main jets over stock; here's a chart showing stock sizes

http://members.dslextreme.com/users/bikecliff/images/carbspec_float_height.html#A01

Basscliff's site has lots of info- someone will show up and point you in direction regarding jet size increase
 
I just had the same thing happen. I assumed it was a stuck float, I had just cleaned them and reinstalled them.

Fired up first kick but once it warmed up #3 exhaust started to drip gas. The petcock doesnt leak when I disconnect the hoses so I figured it was working properly.
 
BigGreen said:
Fired up first kick but once it warmed up #3 exhaust started to drip gas. The petcock doesnt leak when I disconnect the hoses so I figured it was working properly.
Click to expand...

But when vacuum is applied to petcock, the diaphragm might leak down to #3. For a simple test, put a clear vinyl hose on petcock vac fitting and suck on it- beware!
 
tom203 said:
But when vacuum is applied to petcock, the diaphragm might leak down to #3. For a simple test, put a clear vinyl hose on petcock vac fitting and suck on it- beware!
Click to expand...
If you run this test, get a nice long piece of tubing and loop it. That way you can see the fuel prior to ingesting it, and stop the test if any fuel appears in the line.
 
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