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Old post about turning a vacuum petcock into a manual one....

tkent02

tkent02

Forum LongTimer
Past Site Supporter
I wrote this post about ten years ago, can't find it now. Any ideas? How can I do a google search of old forum threads?

Thanks!
 
Tag the search, gs resources. loads of them out there mostly leading back to the old tech info archive
 
It's not working that way, GSR search is weak, need to use google but i don't know how to put my name in the search.
 
Hmmmmm............ Just adding tkent to the string drags in all results.
Try tkent+petcock+manual , exact match or something like that.
 
Somehow I'm not getting it to work.

Can someone please show me how to put my name in the google search complete with whatever slashes or plusses or whatever I might need?

Thanks!
 
Quotes around a word or phrase mean that phrase (as in quotes) must be returned and a PLUS SIGN in front means that the word MUST be in the document.

Entering the EXACT username doesn't mean posts started by that person; only that they were part of the thread I think.

Here are the results I got from a search on +"petcock" using tkent02 username as the search criteria:

http://www.thegsresources.com/_forum/search.php?searchid=1201472
 
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OK, I got that same exact nothing from the GSR search, many many times using different phrases and words. Anyone know how to put it in a google search including my name?

Thanks!
 
tkent02 said:
OK, I got that same exact nothing from the GSR search, many many times using different phrases and words. Anyone know how to put it in a google search including my name?

Thanks!
Click to expand...

Caveat emptor; Google does not necessary hold all pages of a domain in their index; they drop what they deem irrelevant. So the GSR Search may show more results than google.

For google, try some permutations of the following query:
Code: 
+tkent02 +petcock site:thegsresources.com

As mentioned, everything word preceeded by a plus must appear on a page to be included in the results. If you want a phrase verbatim, add double quotes:

Code: 
+tkent02 "petcock conversion to manual" site:thegsresources.com


Also, you can limit your results to a certain date range through the "Search Tools" menu. Might help since you mention a rough estimate when it was posted. But watch out, I'm not sure wether Google actually parses the post dates, or refers to the date when a page was added to their index!

I think you know best wether it was titled "conversion", "update", "change", or whatever. IIRC, google tries and includes conjugated and similar words automatically, but not sure. Google's strength isn't really searching within a big and 'weakly' interlinked text corpus such as one of a forum, but rather doing that for myriads for web-pages.
 
OK, I figured out what I did before and did it again. Works great, has a real off position now. Took some pictures even, if there's any interest I'll make another thread about it.
 
I wouldn't mind seeing what you did. I have an idea but it'd be nice to actually see it done.
 
Yup, I would be interested as well. Never had much use for that PRI anyway.
 
tkent02 said:
OK, I figured out what I did before and did it again. Works great, has a real off position now. Took some pictures even, if there's any interest I'll make another thread about it.
Click to expand...

Count me in as well. I would much prefer a positive manual shut off to trusting that the vacuum system is getting it right.


Mark
 
Count me in as well. Replacement petcock for my 1000E is higher priced than a lot of other models. Just don't know whether it is smarter to replace with stock or to go the Pingle route.
 
This little mod can either give a functional but slightly leaky vacuum petcock a positive shut off, or do the whole thing and make it a completely manual petcock. This works on any GS prior to 1980 as far as I know, doesn't work on anything 1980 or later as they use completely different petcocks. Any petcock that looks like this:

IMAG0595.jpg


My 550/675 I did the whole thing, there's no vacuum function at all anymore. The 750 I'm doing today I think I will leave the vacuum system in place. It mostly works, but doesn't shut off completely anymore. I have been disconnecting the fuel line when I park it more than a day or so, and putting on a long hose, looping it up over the gas tank so no fuel can come out. Pain in the butt so I'm doing the mod to add a real off position.

On the front there is a steel plate held on by two screws, the one labeled On, RES and PRI. This one:

IMAG0598.jpg


Take it off, there's a little tab at the top of the hole which stops the travel of the lever at either PRI or RES.
Grind off the tab, so the lever can go all the way around, you now have an off position. The lever straight up is off.

IMAG0594.jpg


It works because the curved slot in the inside of the lever merely joins the two inlet pipes together, from the two pipes in the tank, the ones at 12 o'clock and three o'clock in this pic. It does not join them to either the outlet to the carbs on the bottom or to the vacuum valve section in the center. There is no path from either inlet pipe to the rest of the petcock.

IMAG0596.jpg


Depending on your tank and the exact petcock position, you may have to shorten the lever to be able to put it straight up. Some tanks the lever hits the welded edge of the tank, some tanks it hits the bottom of the tank, some tanks it doesn't hit at all. Grinding the lever end off to the edge of the circle has been enough on all of them I have done. My 550 didn't need any grinding, although the lever hits the top of the carb if you turn it in that direction. Going the other way works it fine as is. With the stock VM carbs it wouldn't hit at all.

On the 750, the lever hits the tank, but it goes far enough around to shut off the fuel first, so I didn't grind it off. This is off:

IMAG0590.jpg


That's it, you're done if adding the positive OFF is all you want to do.



To disable the vacuum function completely, take a piece of inner tube rubber or similar and make a gasket for the cover of the vacuum side.

Edit!! Inner tubes have worked in the past, but the one I did in June failed already. Swollen up, and a big crack across the piece that blocks off the diaphragm, turned the lever on and gas poured out the vacuum fitting. Find something better to use than under tube rubber!

IMAG0591.jpg


Pull that vacuum stuff out and toss it. Or sell it on Ebay.

There's a tiny hole that must be blocked, about a 1mm hole which vents the back of the diaphragm. The hole in the 4 o'clock position in this pic:

IMAG0592.jpg


If this vent is left open fuel will just run out all over your engine. Block it somehow, tap it and put in a tiny screw, or fill it with JB Weld, use your imagination. The one I did yesterday on the 550 I hammered a round toothpick into the hole and broke it off. You could also make a flat metal plate to cover the vacuum area, use that instead of the old cover and the rubber gasket would block the tiny vent hole completely. You will see what I mean when you take it apart.

Put it back together, try it out. If the off position still doesn't shut it completely off your rubber piece with the five holes that makes up the valve is probably wasted, or the little wire spring is flattened and not putting enough tension on the lever. Could be the lever needs to be shortened to go far enough around to shut it off. If it leaks out the front around the lever, you need a new O ring on it. These parts are still available from Suzuki. No need to buy the expensive rebuild kits that don't work. Don't forget to block off the vacuum port on the carburetor!!

These part numbers are from a '79 550, but the others probably use the same parts.

44353-33154 GASKET, LEVER $5.85 This is the one that seals around the lever as it turns.

44341-33150 GASKET $2.09 This is the one with the five holes in it that makes up the valve itself.

44348-31051 O RING $5.85 $4.74 This is the one that seals the whole petcock to the tank.

Edit!! Inner tubes have worked in the past, but the one I did in June failed already. Swollen up, and a big crack across the piece that blocks off the diaphragm, turned the lever on and gas poured out the vacuum fitting. Find something better to use than under tube rubber!
 
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