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Poll Poll
Question: Have you had any issues with the stock petcock?

No        no issues so far on my bike
Yes          petcock issues took place
Fixed   I fixed hoses/rebuilt petcock
Replaced          I went with a Raptor
My bike was less 10 years old
My bike was 10 to 20 years old
My bike was over 20 years old
Overheating damage done to bike


« Last Modified by: Oldfeller--FSO on: 10/11/10 at 08:32:46 »

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Issues with stock vacuum actuated petcock (Read 1272 times)
Oldfeller--FSO
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Issues with stock vacuum actuated petcock
10/11/10 at 02:28:58
 

Everyone votes -- You must vote three (3) times if you had petcock issues 3 times, once per section
and vote only once if you have not had any petcock issues at all.

Question Sections are     NO_YES               FIX_REPLACED        AGE IN YEARS        OVERHEAT(optional)




This is to see the overall width and breadth of the petcock problem.  

I think there is a significant percentage of folks who will realize they have had petcock flow issues and perhaps it will lead them to solving this issue (and all the myrad little performance issues that come from it).
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« Last Edit: 10/11/10 at 05:59:45 by Oldfeller--FSO »  

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Re: Issues with stock vacuum actuated petcock
Reply #1 - 10/11/10 at 02:42:42
 

<cut from another thread>


What everybody is saying is that your stock vacuum actuated petcock isn't flowing enough gas for wide open throttle uses for you on your bike under those particular circumstances.

===================

Let's run this thought out a bit -- you are running WFO for a bit and the petcock can't keep up because vac pressure is low and the diaphragm is stiff & old so your your bowl level is getting critical low due to only a dribble of gas getting thru the petcock ....

Bike is turning max rpm and should be making max HP, but instead it's leaning out to the point it sputters and pops.   It leans out to the max and gets really really hot instead.


THEORY

Have we just explained the (not so rare) sudden onset of oil consumption issues, the more occasional piston/rings suddenly getting mangled up and the very rare holed piston and popped off valve tulip head?


If I were a heavy wrist-ed wicker I'd get rid of the stock petcock and go to a Raptor simply to forestall any massive "overheating the engine" issues down the road.  

Stock petcocks will fail eventually on you (given enough time, anyway).
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Re: Issues with stock vacuum actuated petcock
Reply #2 - 10/11/10 at 03:01:14
 
I replaced my petcock with the raptor one.  Even though the mileage was low, my bike is an 87, so I am thinking that age is what got me on this one.  It is a simple fix, which has been said many times before, I am glad I did it.
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Re: Issues with stock vacuum actuated petcock
Reply #3 - 10/11/10 at 03:20:19
 

Good point about years of age being the determinant on the "stiff diaphragm" part of the issue, not simple miles per se.


I'll fix the poll accordingly.
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Re: Issues with stock vacuum actuated petcock
Reply #4 - 10/11/10 at 05:13:53
 
<- poll challenged.
Only voted "Yes".
Fixed: Replaced with Raptor.
Why: Cutting out at high RPM. (Very intermittent, very aggravating)
When: about a year ago?
What: 2002 with lots o miles.
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2002 - Silver (Thumper)
2000 - Green (Mad Hamish)
Most motorcycle problems are caused by the nut between the seat and the handlebars. Make sure yours isn't too tight or too loose.
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Re: Issues with stock vacuum actuated petcock
Reply #5 - 10/11/10 at 06:08:07
 
The only machine on which I have had vacuum petcock issues was a Honda 125 Aero scooter. It was a two-stroker, and the intake manifold vacuum came from the crankcase. It would not run steadily at wide-open throttle, but ran just fine when the throttle was slightly closed. I don't remember the model year, but I bought the machine new so age should not have been a factor.
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Eschew obfuscation.

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Re: Issues with stock vacuum actuated petcock
Reply #6 - 10/11/10 at 06:10:23
 

So your bike was less than 10 years old.

Neat thing about this poll is I rigged it so you can go back in and delete your entire poll entry and then redo it correctly if you screw it up.

I suspect most bikes need to get over 10 years old to have petcock issues, but time will tell us that answer as the poll results add up.

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Re: Issues with stock vacuum actuated petcock
Reply #7 - 10/11/10 at 06:22:20
 
Well, NOW I get it. Even IF my fuel is flowing fine at cruisin around, hard accelerating & giggling levels, it May Not flow well enough at sustained wide open throttle settings. Ill not be running wide open for more than a few seconds while this petcock is delivering the gas. It wont be on the slab again till it has a raptor on it.
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Re: Issues with stock vacuum actuated petcock
Reply #8 - 10/11/10 at 06:24:22
 
Oldfeller--FSO wrote on 10/11/10 at 06:10:23:
Neat thing about this poll is I rigged it so you can go back in and delete your entire poll entry and then redo it correctly if you screw it up.


Poll entry fixed.  Tongue
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2002 - Silver (Thumper)
2000 - Green (Mad Hamish)
Most motorcycle problems are caused by the nut between the seat and the handlebars. Make sure yours isn't too tight or too loose.
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Re: Issues with stock vacuum actuated petcock
Reply #9 - 10/11/10 at 08:39:47
 

Heck, that's a surprise to me -- so many bikes having petcock issues that are less than 10 years old.

Do you suppose that 10% alcohol showing up in regular gas played any role in this larger amount of "newer" bikes having the issue?

Or have the vac actuated petcocks been a crock all along?
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Re: Issues with stock vacuum actuated petcock
Reply #10 - 10/11/10 at 11:49:40
 
I guess I'm unique in that I had 4 checkmarks.

I acquired an '88 with a burnt piston.
Of course I'm not sure what caused it, but doubt that it was the 155 main jet.
The PO said he was running down the superslab at speed and it lost power.  He commuted to torrance? to santa clarita.
The bike was about 20 years old, stock.

I'll have to say that if the petcock is causing an overheating problem, it is very locallized.
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Re: Issues with stock vacuum actuated petcock
Reply #11 - 10/11/10 at 17:19:21
 
One bike over 20 years old!  That's me! Cheesy
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Re: Issues with stock vacuum actuated petcock
Reply #12 - 10/11/10 at 20:00:08
 
you left out "had petcock issues and now run it in prime 100%" - that's me.
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c2001, 3800miles, 3rd owner, adjusted idle, raised seat, Tkat brace, Raptor petcock, cleaned carb, replaced some jets, Dyna muffler, Fiamm horns, Shinkos, future Ed L. forward controls, fork boots.
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Re: Issues with stock vacuum actuated petcock
Reply #13 - 10/11/10 at 20:33:09
 

Most of us prefer to have a gas reserve (kinda nice thing to have).

Prime works, but gives you ZERO reserve and some sudden surprises !!!

But you can get some primo extra exercise running in Prime all the time

  -- very good cardiac exercise pushing that bike ....
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Re: Issues with stock vacuum actuated petcock
Reply #14 - 10/12/10 at 04:13:20
 
I guess what Ill do is try to remember to put it on prime if Im gonna be askin for max fuel delivery.
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