More Vacuum Issues

[jblvalk]

Greetings all,

At or about 100 miles into a tank, the engine starts to sputter, and when I put the tank in reserve, the problem goes away.  Only problem is that I never have to go on reserve at that point.

I have noticed a little chirping sound from under the fuel tank (it definitely sounds from air).  That sound is not always there, intermittent to make things a little more difficult to pinpoint perhaps.

Have heard a lot about these pair valve's and how they can sometimes be the issue, or maybe there is just a vacuum hose that is partially dislodged.

Hoping there is someone out there who may have had the same issue and if so, what the solution is to be.

Thanks in advance.
JBL

[98valk]

the diaphragm in petcock needs to be replaced if still OEM. that will cause the poor running and needing to go to reserve so soon.

[9Ball]

Have you checked to make sure your vent line at the rear of the tank isn’t kinked?  If you open the fuel cap when the engine begins to sputter and hear a “whoosh” this can indicate a plugged vent.

Also, if you put too long of a fuel line from the petcock to the carbs this tubing can also kink, thereby reducing fuel flow.

These are pretty unlikely based on your post...Just some things to rule out the simple fixes before tearing into the bike.  The bad petcock suggestion is more likely your issue.

[jblvalk]

Thanks guys.  Would the petcock diaphragm cause the intermittent chirping sound from under the gas tank?  I don't likely think so but your thoughts?

Replacing the petcock makes sense as it is the original.  I may just order one and swap it out.

[The emperor has no clothes]

Thanks guys.  Would the petcock diaphragm cause the intermittent chirping sound from under the gas tank?  I don't likely think so but your thoughts?

Replacing the petcock makes sense as it is the original.  I may just order one and swap it out.

No need for that. Just get the cover set rebuild kit.

[Patrick]

Many folks over the decades have replaced the original petcock with a manual Pingel. They are bullet proof. There is no chance of a vacuum leak and reduces the chance of a fuel lock.

[scooperhsd]

Many folks over the decades have replaced the original petcock with a manual Pingel. They are bullet proof. There is no chance of a vacuum leak and reduces the chance of a fuel lock.

My Valkyrie CAME with a Pingel - I thank the previous owner who put it on....
One other thing with the Pingel - your fuel petcock will no longer be the weak part of the fuel supply stream.

[gordonv]

Don't buy anything until you figure out what is wrong.

Another rider had intermittent problems with his, seemed heat related. I never inspected his bike, but it turned out he had a fuel filter installed. Removed and I've heard no further issue.

Noise, I wouldn't worry about yet.

Does this happen on every tank?
What has been done to your bike since this started happening?


As a side, this should be in the Tech section.

[GiG]

Greetings all,...

I have noticed a little chirping sound from under the fuel tank (it definitely sounds from air).  That sound is not always there, intermittent to make things a little more difficult to pinpoint perhaps...

"Buzz Bolt"   

[Valkpilot]

the diaphragm in petcock needs to be replaced if still OEM. that will cause the poor running and needing to go to reserve so soon.

+1

[Patrick]

I agree the problem should be pinned down before doing/replacing anything.

[Calboy]

Many folks over the decades have replaced the original petcock with a manual Pingel. They are bullet proof. There is no chance of a vacuum leak and reduces the chance of a fuel lock.

Which Pingel are people actually getting? There are about 7 Petcock models that fit 1997-2003 Valkyries.

[scooperhsd]

The 1311 series.

[Cyclejohn]

I have noticed a little chirping sound from under the fuel tank (it definitely sounds from air).  That sound is not always there, intermittent to make things a little more difficult to pinpoint perhaps.

The short vacuum hoses that attached to the air cut-off diaphragms chirp/whistle when they reach the point of starting to split.

[jblvalk]

Does not happen with every tank.  The chirping sound is intermittent.  No hoses are crimped.  From what I can see shining a light into the underbelly of the gas tank, there are no breaches in any hoses but not a thorough inspection by far.  I am going to replace the petcock with a Pingel one only because the on I have is original and 21 years old.  When I put the new petcock on, I will do a further inspection along with replacing the air filter.  I fear I may have to take it to a pro to troubleshoot if there isn't something terribly obvious.

Question, what do you do with the vacuum hose after you install the new Pingel petcock?  Do they give you a plug with it?

[Challenger]

---Or this if you decide it is the petcock---

To those that are interested, I found an alternate fuel shut off for my 99 interstate, the valve I used was designed for the Honda CBR600, 1999 and 2000.    PART # 16950-MBW-023

It uses the same thread to attach to the tank,
It uses the same chrome shutoff valve and extension that the Valk uses,
I had to use the screen from the Valk as the one from the CBR600 is too long,

Best part is NO VACUUM operation, PLUS, the price is only $44, Cheaper than the original, and much cheaper than the pingle (that you have to reach all the way under the tank to use)

[9Ball]

Does not happen with every tank.  The chirping sound is intermittent.  No hoses are crimped.  From what I can see shining a light into the underbelly of the gas tank, there are no breaches in any hoses but not a thorough inspection by far.

Question, what do you do with the vacuum hose after you install the new Pingel petcock?  Do they give you a plug with it?

Good to rule out the easy things first.  Seems like fuel system is intact visually.

If you replace the petcock with a manual one then you just put a plug on the intake nipple the same as found on intakes 1, 2, and 5.  Redeyetech sells the vacuum plugs that are better than OEM.

[hubcapsc]

Redeyetech sells the vacuum plugs that are better than OEM.

I like Redeye stuff and recommend it as a good option. But... why are Redeye
vacuum plugs better than OEM? I put new OEM plugs on my intake runners
five or seven years ago, they seemed of great quality when I put them on
and seem to still be doing their job... I only have direct experience to compare
the OEM ones to the flimsy thin ones you can get in an assortment pack
at the otter-parts store...

-Mike

[jblvalk]

Thank you for all of the useful replies everyone.  I've decided to replace the petcock with the pingel unit 1311-CH just because the original is 21yrs old.  I need to replace the air filter anyway so it's timely.  The only thing I kind of dread is removing the air filter box to get a better look at the vacuum hoses below.  What kind of experience do I look forward to squeezing that thing out of there?

Also, I talked to Pingel and the guy said they send a plug along with the new petcock to shore up the liberated hose once installed.

[9Ball]

Redeyetech sells the vacuum plugs that are better than OEM.

I like Redeye stuff and recommend it as a good option. But... why are Redeye
vacuum plugs better than OEM? I put new OEM plugs on my intake runners
five or seven years ago, they seemed of great quality when I put them on
and seem to still be doing their job... I only have direct experience to compare
the OEM ones to the flimsy thin ones you can get in an assortment pack
at the otter-parts store...

-Mike

The oem rubber hardens and cracks.  I’ve had better luck with the Viton-B plugs from redeyetech as they stay flexible and aren’t prone to hardening and then cracking when removed.  If you remove your current plugs to do a carb sync then you may notice deterioration....or maybe not.   You’ve had a good run with your plugs.  Stick with whatever works best for you.

BTW, I love my 6 channel Digi-Sync...sold my Morgan CarbTune II.  Makes carb sync quick, easy, and accurate.

[hubcapsc]

If you remove your current plugs to do a carb sync then you may notice deterioration

I got a digisync... in Morgantown I think... haven't synced yet... perhaps I'll try to have
some redeye vacuum caps ready when I do 

-Mike

[The emperor has no clothes]

If you remove your current plugs to do a carb sync then you may notice deterioration

I got a digisync... in Morgantown I think... haven't synced yet... perhaps I'll try to have
some redeye vacuum caps ready when I do 

-Mike

If you got the digisynch from BonS, the kit likely has a set of vacuum plugs in there. They are of exceptional quality. 

[Calboy]

The 1311 series.

How does one decide, that's the question!
These are all the 1311 series petcocks for the Valkyrie


1311-AH
1311-CH
1311-CD
1311-CHBLK
1311-CF
1311-CL
1311-CR
1311-CG

[98valk]

my oem petcock diaphragm failed at 15k miles. rebuilt it and put a snubber in the vacuum line which reduces the heavy spike movements of the diaphragm during on/off throttle conditions. 62k miles now, zero problems.

[jblvalk]

The 1311 series.

How does one decide, that's the question!
These are all the 1311 series petcocks for the Valkyrie


1311-AH
1311-CH
1311-CD
1311-CHBLK
1311-CF
1311-CL
1311-CR
1311-CG

I actually decided to go OEM after deciding to get one of the Pingel petcocks after I learned that you have to turn off the fuel everytime you stop the bike.  I can see myself forgetting to turn it off very easily.  Don't need something else to remember to do.

[98valk]

The 1311 series.

How does one decide, that's the question!
These are all the 1311 series petcocks for the Valkyrie


1311-AH
1311-CH
1311-CD
1311-CHBLK
1311-CF
1311-CL
1311-CR
1311-CG

I actually decided to go OEM after deciding to get one of the Pingel petcocks after I learned that you have to turn off the fuel everytime you stop the bike.  I can see myself forgetting to turn it off very easily.  Don't need something else to remember to do.

u need to always turn off the OEM also. The vacuum feature is a safety item in the event of a tip over or crash, when the engine stops running, so the fuel flow will stop, preventing the worst from happening.
easier to get to then the pingel which would be under the tank.

[jblvalk]

I've had the bike for 21 years and have never turned the fuel off after parking the bike save for when I was back east and I would store it for the winter.  Never had a problem with hydro lock or anything else for that matter, until now.   Decided to go OEM for that reason. 

[Willow]

u need to always turn off the OEM also. ...

No.  No, you don't. 

If you have  a non-vacuum without additional flow protection it will flow until the floats stop it (if they do).  The OEM will only flow in the non-running state if something fails in the petcock.  Not at all a close comparison.

[98valk]

u need to always turn off the OEM also. ...

No.  No, you don't. 

If you have  a non-vacuum without additional flow protection it will flow until the floats stop it (if they do).  The OEM will only flow in the non-running state if something fails in the petcock.  Not at all a close comparison.

turning the OEM petcock to "off" is a positive shutoff. with the vacuum shutoff a spring and diaphragm are causing the shutoff.  I do not want to rely on a spring only, which can and will loose tension over the yrs, I want positive shut off.