Fuel Valve - A little different?
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  1. #1
    Senior Member ezman671's Avatar
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    Recently got an XT350 gas tank. The fuel valve works very hard and since it is around 20 years old I thought I would just replace it.



    Looking at it on the bottom is a plastic plug with a square top that unscrews from the bottom of the valve opening a port into the gas flow lines.



    Any ideas what the purpose of this was?



    Maybe just a simple way to drain some fuel?

  2. #2
    Senior Member wayne's Avatar
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    ezman671, My stock fuel valve fit into my xt350. Maybe that would be the way to go.



    Wayne.

  3. #3
    Senior Member lizrdbrth's Avatar
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    Nope. It's a built-in fuel filter. Inside the bowl there's supposed to be a removable, cleanable bronze screen. Anything the screen missed settled into the bowl and never made the pilgrimage to your carburetor.



    Deleting those from virtually every petcock now made was a visionary and remarkable bit of social engineering foresight, and the first of many such "improvements" which later lead to the prevailance of carb cleaning threads in the computer age. This in turn has brought us all together with a common misery. Ergo, dirty carbs have brought together persons of vastly disparate backgrounds, faiths and nationalities who may not have otherwise met. How cool is that??



    Cumbaya.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  5. #4
    Senior Member lizrdbrth's Avatar
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    The good news is that your TW petcock will bolt right up. Kinda leaves you with a pretty short reserve, though.



    My 350 tank uses the modern replacement valve for an XT600. Little longer reserve tube, but otherwise identical to the TW replacement item. 15 bucks or so.



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  6. #5
    Senior Member peruano's Avatar
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    Okay Russ, I've heard you say that the xt350 tank (or is it the petcock too) has a very short reserve. Having never run mine far on the reserve, I've no idea how shallow that reserve is. Is it that there is much of a gallon that is not reachable when the xt350 tank is mounted as we have done on the tw200, or is it that there is not much gas left when the main kicks out and you have to switch to reserve. As I remember, the one time I hit reserve at 184 miles (after much full throttle and a head wind so probably getting less than my typical 85 mph), I still estimated my having something like a gallon on board. So was it not available to me, or is my tank geometry slight different and potentially I really don't have the 40-80 miles I would like to think I have beyond the 184 miles I used on the main (180 + 60 or so = 240 miles or more). Inquiring minds want to know and be forewarned, your prognoses will be tested by a herd of xt350 tank users. Thanks and cheers to the very tolerant Mrs. Lizrdbrth. Tom

    BTW Its my impression that petcocks that are tight to turn are merely tightened too tightly with the 2 or 3 screws that attach the face. I experienced one that was too tight after I rebuilt it, and found it easy to loosen without causing any problems with leakage. Before the OP replaces the valve, I'd try to adjust it. That said Russ is correct, the entire petcock assembly is cheap and its also true that the xt350 and tw200 have the very same part number for the petcock (when I last checked on Bikebandit). Sometimes the entire part is cheaper than even half of its constituent parts (I paid over $11 for a couple of gaskets and o rings to go in a petcock that was $16 for the entire unit - go figure. Tom
    Tom - TW200 2002, Kawasaki VN 500 2006

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  7. #6
    Senior Member lizrdbrth's Avatar
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    Tom, I think it will vary a bit with our various installations and mpg numbers. The rear of yours sits a bit higher than mine, so theoretically you should have less fuel available at the petcock than I when you hit reserve, but you're getting far better mileage. On level ground it takes very little difference in tank angle to affect how much remains in the tank at reserve. Again, theoretically you would have a bit more unusable fuel hiding in the "ears" of the tank, but you get nearly 15 mpg better than I.



    I figgered with a 3.2 gallon tank I could afford the luxury of a 75 mile warning, so I went with the longer petcock tube.



    The only time I've ran mine dry was when I made the beginner's error of leaving the petcock on reserve after filling up. I usually hit reserve somewhere between 150-160 but I never push it.



    I used a bit of a misnomer when I refered to the reserve tube. It is in fact the main tube which determines the point where you hit reserve. All the reserve pickups are pretty much flush with the bottom of the tank, and the various replacement items are all identical except for the length of the main pickup tube.



    Removing the crapcatcher feature was just stoopit, and required new tooling, to boot.



    My version of the justification for doing so is more entertaining and optimistic than the actual justification, which reads as follows:



    "Damndest thing. We go cheaper incrementally, year-by-year, yet charge more, and they keep buying our stuff anyway. Go figger."



    Humor me for mourning the passing of things that actually served a valid purpose



    I can explain it to you, but I can't understand it for you.

    Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.

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  8. #7
    Senior Member ezman671's Avatar
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    Yes I know my TW200 valve will fit. And I know a new valve is available for about $14 and the repair parts even less.



    I already ordered a new valve.



    Just was wondering what the different shape and the drain plug on this one was for.



    Unfortunately the brass filter screen was not in place in this one. If I get a chance I'll post a picture.



    Looked at various year fuel valves but never saw anything different than what is on a TW.



    BTW - Got the used tank for $50 + $15 shipping. It is spotless inside and not to bad on the outside. The seller did a great job shipping and the $15 was a deal.



    Looks like he spent more than that on box, wrapping and foam.

  9. #8
    Senior Member ezman671's Avatar
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    Maybe to many people were breaking the plastic plug so they got rid of it.



    To bad. I would like to find the filter for this housing.








  10. #9
    Senior Member gfletcb's Avatar
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    One of the first motorbike mechanic mistakes i made was breaking one of those little bowls on the neighbors' bike trying to remove it.

    I guess I thought i could fix everything when i was 14...

    Come to think of it, a lot of seriously old motors had a settling bowl inline with the fuel line.

  11. #10
    Senior Member ronnydog's Avatar
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    I used the TTR 225 petcock on my xt350 tank.



    ronnydog

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