It just aint running right!!!!!!

[groundpounder01]

Bike was acting up on a trip to Ohio , some on the board said clogged slow jet. Done a cleanout with a Pingle/Dan-marc Fuel valve conversion. I also added a inline filter for assurance. All was well for 200 miles and it is acting up again. It idles fine with the choke on but it spits with it off. Also wide open on the road its fine but when you let off the gas it back fires alot. Any ideas? This broke bike is killing my rideing and that aint cool!

[Bone]

Did you try opening the gas cap while it was running bad ?  Vaccum lines ok ?

[sheets]

Assuming the vacuum lines are okay... are the vacuum caps on the backside of the intakes (with no vacuum lines attached) in good shape... not rotted away...? 

[paul]

Check the vent line,,make sure its not kinked,,reach up in there over your center cover,,where the seat lock is and feel for it..ive kincked mine a couple times puttin the tank back on...ran,,,after a mile or two had so much pressure in the tank,gas was seeping up through the cap//but still ran,,

[eric in md]

my guess is vacuum cap or line from behind intake runner.. check them good ..

[groundpounder01]

Are you talking about the vent line that is hooked on the tank? Good ideas I will check.

[R J]

I'll put my $$$$ on the old Brown Nag in post #6.

There are some vacuum lines in between the carbs.  Have ya ever replaced them?

If not, that is the 1st place I'd look.

If ya have, then look to see that the ones that should have a little rubber cap, like #6, are there.  If the lines are brittle or mushy, change em out again. or just DeSmog the critter.

Sounds like a big ole vacuum leak.

[eric in md]

some have hoses some have just a cap on them

[fuzzy2bucks]

Dr. Fuzzy2bucks recommends you try a dose of Sea Foam, about 3/4 can to a half a tanks worth.

[John U.]

A vacume leak is likely, check the clamps on the rubber connectors from the carbs to the intake tubes. Did you replace them? Are the intake O-rings good, sometimes they get dislodged when replacing the tubes.
I hate to say it but idleing well with the chock on but not so well with it off still sounds like it could be slow jets. Did you replace them? 
It's possible that some gunk got broken loose while working on the carbs and has reclogged one or two. I'd give some Techron a try, can't hurt.

[paul]

Yes the small vent line ,,connects to the tank,,,,has to be clear......along with the other mentioned vac. lines also...

[Ricky-D]

Bike was acting up on a trip to Ohio , some on the board said clogged slow jet. Done a cleanout with a Pingle/Dan-marc Fuel valve conversion. I also added a inline filter for assurance. All was well for 200 miles and it is acting up again. It idles fine with the choke on but it spits with it off. Also wide open on the road its fine but when you let off the gas it back fires alot. Any ideas? This broke bike is killing my rideing and that aint cool!

I don't think it's the jets if the effects are with all the carbs.

There have been other threads concerning the problems associated with fuel filters and they all report poor flowing characteristics for fuel.

That's what it sounds like in your case.

Remove the filter and see if that cures the problem. Try the shutoff also. It could be the culprit.

***

[groundpounder01]

Have tried the sea foam in a tank and no change. Took the filter and the valve out as well and no change. A can of starter fluid can tell of a vac. leak right? What does the desmog require removeing? Are there any indepth instructions on the web?

[fuzzy2bucks]

The only fuel filter I trust is a Pingel.   It takes awhile for Sea Foam to work.  In my case of  seriously
not using Stabil correctly for 10 years, it took about 30-40 minutes of riding at 60-70mph to clean the carbs and dissolve the deposits.   ( just my 2 cents worth)   

[groundpounder01]

A vacume leak is likely, check the clamps on the rubber connectors from the carbs to the intake tubes. Did you replace them? Are the intake O-rings good, sometimes they get dislodged when replacing the tubes.
I hate to say it but idleing well with the chock on but not so well with it off still sounds like it could be slow jets. Did you replace them? 
It's possible that some gunk got broken loose while working on the carbs and has reclogged one or two. I'd give some Techron a try, can't hurt.

Bought new o-rings from redeye they look to in right. Is there any better clamps to use on the vac lines?

[Patrick]

It certainly sounds like a vacuum line/leak issue or some varnished/plugged low jets.. If the bike runs well at high speed and will accelerate properly above 3000 rpms then I doubt there is a fuel flow/supply issue.. I'd recommend replacing all the vacuum lines and caps, run a few tanks of good heavy doses of Sea-Foam[full cans] thru the monster.. When running it, find where it runs smoothly and just reduce the rpms until it just starts running poorly.. Keep it at that speed until it clears up and then reduce the speed some more and repeat.. If that doesn't fix it then its time to get your hands dirty and clean some carburetors..

[groundpounder01]

How much sea foam per full tank of fuel?

[fudgie]

All of it. I usually will dump a can full in at less then half a tank. Others have used Lucas & Techron with good resualts to. 

[Mr. Nuts]

If you didn't replace your slow jets I would start there. While some have had luck with magic concoctions, all I did was waste money and time. The jets are cheap and not all that difficult if you follow instructions from this site. Also don't forget to check for a kinked fuel line. I have the same setup and mine ran fine for 200 miles before acting up. It is very common to have a hose too long after adding the dan marc valve and inline filter. I only figured out my problem when several others here reported the same thing after about 200 miles.

[Ricky-D]

If you didn't replace your slow jets I would start there. While some have had luck with magic concoctions, all I did was waste money and time. The jets are cheap and not all that difficult if you follow instructions from this site. Also don't forget to check for a kinked fuel line. I have the same setup and mine ran fine for 200 miles before acting up. It is very common to have a hose too long after adding the dan marc valve and inline filter. I only figured out my problem when several others here reported the same thing after about 200 miles.

Was that before, or after you changed the jets?

***

[Mr. Nuts]

Was that before, or after you changed the jets?

***
[/quote]

Good question. My clogged jets were dealt with last year. This years adventure was with the kinky fuel line after the Dan Marc and filter. So separate problems for me. But what a bummer had they happened together. My fuel kinks caused high speed problems. Jets low speed aggravation.