Never seen this before?

[Gloomshadow]

boiling point for fuel is real low.. nowhere near the flashpoint. venting issues sound real possible.

 

[djs2k2]

I know the vent tube works for sure it leaks and sprays vapors when it's hot the cap I'm not sure but it looks super clean. I'm sure the breathers are cheap themselves, but I can almost guarantee they're going to charge an arm and a leg to rotate my motor to get to both of them! If the breathers are bad, is there a test I can do to check them without a tear down?

 

[djs2k2]

And now the bike doesn't even want to idle it just wants to bog down and cut off if I give it a little gas to try to keep it running it hesitates for a minute like its flooded and then it'll rev right up. But weight idle on its own.

 

[AZmidget91]

Blow in your breather tubes, shouldn't be able to blow into them.

 

[djs2k2]

So I blew into them the one on the right as you are sitting on the bike let no air in, on the left as your sitting on it when I blew in to it seemed like it let a little air in? I tried starting the bike like 30 min ago and it wouldn't idle still, so after I blew into the breathers tubes I reconnected the dobeck and fired it up. Surprising enough it idled so I tested my luck and drove around the parking lot a few times and around the block drove normal. What do you think?

 

[djs2k2]

I do appreciate all the input, and hope we can figure this out!

 

[Gloomshadow]

how old is that battery?

 

[djs2k2]

Battery is less than a year old 7months to be exact.

 

[Gloomshadow]

mine did some real weird stuff when it got weak.. it could be as simple as that.. this motor is hard on batteries.. hummm

that's weird it wouldn't run without the dobeck

 

[djs2k2]

I will take dobeck back off tomorrow that could be just a coincidence but the only other thing i did was blew in the breather tubes, " and one seemed to let a little air in" does anyone know if that breather could be causing all my symptoms"?

 

[djs2k2]

So does it sound like the breather that i can blow a small amount of air in, could be my problem? Could it really cause this issues?

 

[AZmidget91]

I highly doubt it. If it was me, I'd throw away the dobeck, and get the stock map reflashed on the ecm. It's never good to diagnose when there are obvious potential problems.

From there, check intake seals and fuel pressure.

 

[rchuff]

Sound like you should sell your bike.

 

[djs2k2]

I love my bike I've never had issues before this? I wish I could get a trouble code to have a starting point!

 

[Cooter]

I'd like to help but now I'm totally confused after reading this thread. Sorry but, please lay out for me what exactly it does?

So far I got:
1) It ran OK but felt hot one day, the fan acted normally.
I'd guess normal there, but clues are in the details, Thanks

2) A different day, you needed fuel and opened the tank and saw fuel bubbling.
Did you see it before filling up, or after? Still normal-ish though, it will bubble well before it's dangerous (I ride an 1125...). But it was running OK that day as well?

3) A completely different day you re-started a warm bike and it wouldn't idle, and also wouldn't run, even at full throttle. Then, immediately you re-started it and it ran fine the rest of the day. Did you have to re-start it during that period while it was running ok?
How did it start that day when it initially ran bad? Did it start easily?, or did it take a few tries to start it before it ran crappy?

4) Now the fuel bubbles AND it spits out of the fuel overflow tube when hot (like an 1125).
That's unusual for an XB, especially with a low ambient temp.

5) When it's running ****ty, and it dies, then you hear the fuel pump prime. That's normal.

If all of that ^^^^^ is true, I can eliminate some of the guesses and I have some work for you to do

To paraphrase, It sounds like some days it runs ok all day, other days it runs bad but only just after starting it (warm or cold bike)? It won't be running down the highway OK... then just start to run ****ty? Right?

Bad crankcase breathers can cause weird running issues, but can not pressurize the fuel tank. So don't rotate the engine yet!

The Dobeck is a gel filled very tough unit meant to take the vibes of Buells and Harleys. Highly unlikely it's an issue, but it is also totally unnecessary since you already have a race tune. It's improper diagnosis procedure, but go ahead and leave it off. I doubt it matters either way, but it will eliminate some possible wiring issues, as you have an intermittent problem.

Bad gas is a slight possibility, but not normally in the US and hardly for an intermittent problem. If it's trying to run on bad gas, it's usually just gonna run ****ty... But see below about additives.

It's strange you don't have a code. Your "race program" may be set up to mask that. Check your settings with ECMspy etc...

We need to see if it's a Fuel, Spark, or Air, issue so lets eliminate the easy stuff first.
Air: Take off the air filter and blow it out from the inside ONLY. Is it greasy?
Look down the throttle body, open the blade and use a clean rag with carb cleaner on it to clean the bore and the back side of the blade. Don't just shoot that crap in there!
Is the IAT sensor still in there? Is it plugged in? Don't spray it with carb cleaner, but you can wipe it off gently.
While your in there, take off the air filter base plate and try to pull apart all the connectors you can get too, t's out of diagnosis order, but hopefully you find a bad connection.

Fuel: You'll need a pressure gauge that screws onto the schraeder valve on the injector line. And you'll need to be able to read it while the bike is running ****ty to eliminate a pump, regulator, or cavitation problem. Should have a consistent 45-55psi that doesn't dip when you crack the throttle. Don't worry about checking flow just yet...
Most fuel additives separate water from the gas. There are 2 types (coalescing and emulsifying) and it's important to know which.
Coalescing just separates fuel and water, but where does the water go? It goes to the bottom of the tank where the gas pick up is It is meant to use when you have a coalescing filter inline that you can drain the water from. Typically for diesel fuel systems. If you use it in your gas vehicle, you'll be sucking straight water
Emulsifying additive basically absorbs the water so it will mix with the gas and be burned in the engine. Gas engines can digest quite a bit of water and run ok. It can even keep them cleaner
The reason for that diatribe^^^^ is which one did you use?? A diesel fuel additive could cause you issues.

Spark: Most intermittent problems are electrical, and I think yours is too You'll need to see if you are getting spark and if it's at the right time while it's running ****ty. I find it easier to start at the spark plugs and work back through the system. A systematic approach is critical to make diagnosis work. Lets do a visual first.
Pull the plugs, do they look OK? post pics, because too clean can be a problem too. Are the tips screwed on tight, gapped well? worn?
Check the high tension wires, cracked, arcing, not screwed in the coil all the way?
Check the coils, mounting bolts corroded? tight? Unbolt them and see. plugs and terminals clean? take them apart and look. You can even spray with carb cleaner (but electrical cleaner is better) I don't suggest dielectric grease there. It's an insulator and will make a bad connection worse.
Wiring, are the coil primary wires discolored? brittle? pull back the harness cover as far as you can.

Well get into testing the coils later, right now stick with visual. This post is way too long and my wife wants to go to happy hour:eagerness:

 

[Cooter]

If I'm right about reading the clues you wrote, I'll guess:

1) You may have a huge cavitation issue in the fuel system. The pressure gauge test will show that. Then we can look at tuning issues, or pump assembly issues.

2) Or you have an intermittent spark problem. A grounded test light near (NOT poking!) a spark plug wire while it's running ****ty will show that.

3) Or you have an intermittent timing problem. Which is unusual for these bikes, but far from impossible. Same low-buck test ^^^^ can show that too.

It's Friday! Go get in that garage!:angel:

 

[AZmidget91]

Have you checked intake seals? literally takes 5 seconds to test, spray carb cleaner towards the side of the throttle body, if the RPM changes, they are bad. Intake seal leak will run the front cylinder lean and make the header red hot, boiling the fuel, causing a hiccup in the intake....

 

[Chicknstripn]

Very good observations cooter and excellent advice! but you missed one thing... ...dude doesn't have a garage! That's half his trouble shooting problem

 

[Cooter]

All I asked him to do was disassemble is the air cleaner base.

If he doesn't have space for that, just take it to a shop.

I'm good, but I'm not clairvoyant.

 

[djs2k2]

Very good info like chicknstripn said I just need to find a place to put it to use! Apartment complex.......