Author Topic: Question about Steve's overflow tube mod  (Read 3315 times)

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Offline Derick

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Question about Steve's overflow tube mod
« on: September 19, 2014, 11:50:16 am »
I've been watching/considering steves overflow tubes mod for a long time now. I have a manual shutoff valve for the fuel as it is right now, so I just kill it at the front of my drive, I just ride it in on the last few drops of fuel - the key is remembering....

What I dont know, is how it works. I mean, looking at the directions, it is just rubber tubing connecting the carb drains....but arent those only open when you unscrew and open them?
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Offline mattchewn

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Re: Question about Steve's overflow tube mod
« Reply #1 on: September 19, 2014, 11:54:26 am »
dboogie2288,
Uh, no. The tubes are fitted to the bowls in such a manner as to allow the fuel level in the bowl only up to a maximum level before it will flow down through the overflow tubes and onto the ground.  Think salad bowl somewhat full of water with a pipe that comes up through the bottom to some level inside the bowl. No matter how much water you add the bowl will not fill past the level of the pipe. The pipe will drain away the excess.
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Offline Derick

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Re: Question about Steve's overflow tube mod
« Reply #2 on: September 19, 2014, 12:43:17 pm »
That's exactly what I figured the premise of the product was....but the instructions really just talk about installing the tubes themselves;

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzaG9vZGFiZW5lbmdpbmVlcmluZ3xneDo0ODEzNzBiMmQ5Y2NhYzg3

So what other steps are in the installation process?
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Offline RWulf

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Re: Question about Steve's overflow tube mod
« Reply #3 on: September 19, 2014, 01:19:07 pm »
It's just like the overflow tube in your toilet. When the gas gets to the top
of the tube it flows into the tube down to the rubber tubing and onto the floor.
Not into #2 cylinder.

Offline jettawreck

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Re: Question about Steve's overflow tube mod
« Reply #4 on: September 19, 2014, 01:23:13 pm »
That's exactly what I figured the premise of the product was....but the instructions really just talk about installing the tubes themselves;

https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxzaG9vZGFiZW5lbmdpbmVlcmluZ3xneDo0ODEzNzBiMmQ5Y2NhYzg3

So what other steps are in the installation process?

Taking the carbs off and sending them to SISL... ;)
Or just the bowls if overflow tubes are all you want done. In the bowl where the drain is Steve press fits a critical length of tubing. This is below the point fuel could flow out of the bowl into the carb throut and into the cylinder(s) if the petcock and needle valve and/or seat failed to control the fuel level/delivery. The rubber tubing on the exterior of the carbs are just to carry the overflowed fuel (if ever happened) away from the engine area.

Highly recommend getting it done. 
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Offline Derick

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Re: Question about Steve's overflow tube mod
« Reply #5 on: September 19, 2014, 02:37:32 pm »
Ahhhh OK... I wondered because 80 bucks seemed to be a little steep for just some tubing that you slip on.
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Offline Nosmo

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Re: Question about Steve's overflow tube mod
« Reply #6 on: September 19, 2014, 04:37:09 pm »
It's easier when you think of it as money spent to prevent engine ruin due to hydrolock.  :great:
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Offline Derick

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Re: Question about Steve's overflow tube mod
« Reply #7 on: September 19, 2014, 07:19:31 pm »
It's easier when you think of it as money spent to prevent engine ruin due to hydrolock.  :great:

nono, i'm fine with the fee.....but based on the directions alone, it was missing that "send to steve so he can do his thing" step. I was under the impression it was just a parts product, not parts + service.
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Offline Bergmen

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Re: Question about Steve's overflow tube mod
« Reply #8 on: September 20, 2014, 11:07:19 pm »
They'll look like this when they're done:



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Offline ConnMan

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Re: Question about Steve's overflow tube mod
« Reply #9 on: September 21, 2014, 12:13:33 am »
Its all about precision machining. A hole has to be drilled and reamed to the precise size of the brass tube O.D. so it can be press fit in the bottom of all 4 bowls.  So it's not just adding parts. It's modifying and adding parts, and unless you are a machinist. Steve is your guy.  Many trust him.
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Offline The Wizard

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Re: Question about Steve's overflow tube mod
« Reply #10 on: September 21, 2014, 07:48:38 am »
But do you need it with a manual petcock?  The Wizard
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Re: Question about Steve's overflow tube mod
« Reply #11 on: September 21, 2014, 09:02:18 am »
But do you need it with a manual petcock?  The Wizard

Depends on whether you ever occasionally forget to turn off your petcock.  I am pretty good about turning off my manual petcock, but there have been time where I have forgotten.  It is nice to have the assurance of overflow tubes.  I have manual petcocks on both of my C-10s along with Steve's overflow tubes.



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Offline WillyP

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Re: Question about Steve's overflow tube mod
« Reply #12 on: September 21, 2014, 01:08:01 pm »
It really depends on what your definition of 'need' is. I don't have them on my bike, don't need them. If mine hydro-locks, and is destroyed, I don't care, because I have a friend who collects scrap metal, and I'll give him both bikes, all the spare parts kicking around, and throw in a few helmets to boot. Then I'll go buy a Harley and a do-rag.


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Offline Mcfly

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Re: Question about Steve's overflow tube mod
« Reply #13 on: September 21, 2014, 01:43:21 pm »
Yer killin' me WillyP..  :D

Liken it to  'tip over bars' on motorcycles...  You never plan on dropping your bike...
... you just know it can (or will) happen.

The overflow tubes will 99.9999% guarantee that fuel will not spill over into your
engine cylinders.  There is that .0001% chance the overflow tube gets clogged,
though I really don't see how.

So, if your manual petcock is 100% reliable, and you are 100% reliable, then there is
absolutely no need for overflow tubes, and I applaud your self confidence!

I got 'em put in with SISF's carb service and 2 min jet mod.  I hope they never serve
their purpose (and haven't to date), but I'm glad they're there just the same.

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Offline Camper Dave

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Re: Question about Steve's overflow tube mod
« Reply #14 on: September 21, 2014, 02:10:01 pm »
But do you need it with a manual petcock?  The Wizard
Well, I believe my petcock was operating properly but with a bad float needle thingy, I think all the gas flowed from the fuel lines into the lowest carb, then into that cylinder. There was enough gas in there it wouldn't/couldn't turn over. Over-flow tubes would be the last line of defense..


Then I'll go buy a Harley and a do-rag.


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Offline zg2002-Murph2

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Re: Question about Steve's overflow tube mod
« Reply #15 on: September 21, 2014, 04:01:35 pm »
I got a question for you relating to the overflow tubes. I have read the zg1200 bowls have them and you can swap your bowls and have overflow tubes from a donor zg1200 carb set. Thinking along that line I am sure the bowls will be in OK shape, but what other parts would be a direct swap. Are the items like vacuum diaphragms and jets the same?

If so it might be a good value to buy a used set for the bowls and have some more extra spare parts in the shop for the next carb rebuild. Bowls plus just about any other part and you should be able to recoup your investment of the $100 or so the donor carbs could be bought for.

Not sure what year models are good match, but interesting concept.

Of course if you are not into spare parts Steve is the way to get what you got to the maximum potential from everything I have read.
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Offline Nosmo

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Re: Question about Steve's overflow tube mod
« Reply #16 on: September 21, 2014, 05:01:24 pm »
You only need something when something else fails and then you NEED it.

I converted to a Pingel manual petcock years ago, and at the same time did the drain tube mod.  Pingels are nice, spendy units, but anything can fail.  Even if I turn it OFF there's no guarantee that it won't leak internally while sitting.  As others have said, the carb drain tubes are your last line of defense.
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Offline The Wizard

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Re: Question about Steve's overflow tube mod
« Reply #17 on: September 22, 2014, 04:38:38 pm »
Thanks you guys,info is always valuable.   The Wizard
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Offline Daytona_Mike

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Re: Question about Steve's overflow tube mod
« Reply #18 on: September 23, 2014, 01:07:45 am »
Manual petcocks are far more likely to cause a hydro lock than an automatic petcock.
That is why they make Automatic petcocks and got rid of the manual petcocks.
We have had two folks posting  here that hydrolocked their engine and they both had manual petcocks.


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Offline Big John

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Re: Question about Steve's overflow tube mod
« Reply #19 on: September 24, 2014, 06:46:42 pm »
I never have been a very big fan of vacuum operated petcocks. The ones I see fail have both been due to a small amount of trash in the gas tank holding the diaphragm seal from closing completely, and guess what, the same trash kept the float needle from sealing. a redundancy doesn't work if both are disabled by the same failure mode.

I have, however, been told the real reason for the vacuum operated petcocks was actually so that in the case of an accident that killed your engine, the petcock would cut off automatically and not pour gas all over you and, hence, remove a fire hazard. I can see this as a potential safety feature.

When I installed my overflows, I went back with the vacuum. I am still trying to decide if I go vacuum or manual on my xs650. It is vacuum at the moment. The concours and my wife's ninja the only bike I have owned without overflows. My 99 Ducati still has them. Not sure if Kawasaki was just cheaping out or what?