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Vaccum petcock convert without replacing?

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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I was wondering if anyone has ever tried to change the petcock on these Suzukis from vaccum to gravity,using the same petcock? I know I can get a Pingel, I'm just wondering if you can convert the one thats on it.


82 GS300L
 
Re: Vaccum petcock convert without replacing?

ZQJim said:
I was wondering if anyone has ever tried to change the petcock on these Suzukis from vaccum to gravity,using the same petcock? I know I can get a Pingel, I'm just wondering if you can convert the one thats on it.


82 GS300L
Click to expand...

I converted mine to manual a couple of years ago. I disconnected the vacuum line from the petcock and plugged it to prevent intake leak, then use the Prime position for running. When I stop I turn the petcock to Run position which stops the flow. The down side is that I don't have a reserve so I closely monitor my fuel gauge and mileage. I don't think I did anything internally. :?
 
did converting it do away with reserve some how?
Click to expand...

Running on prime is valving directly from the base of the fuel tube, reserve is no longer an option.
 
If you open it up and take the diaphragm and spring stuff out, you can easily convert it like I did.

Take out the selector barrel and figure out which of the two holes is used for "prime".

Fill that hole with JBWeld. Be careful to only fill that hole, and don't get any on the exterior of the barrel. Let dry overnight.

Put the barrel back in.

Use Form-a-gasket or something similar when you put the rear cap (vacuum cap) back on. This area will be flooded with gas after the mod.

Cap the vacuum line nipple with something fuel resistant. You could also stuff it full of JBWeld for a permanant solution.


Doing this mod will let you use the stock petcock as a manual system while still retaining the reserve function. Turning the switch to "prime" now shuts off the fuel. I have been using it this way for 3 years now with no problems.

Good luck....
 
Beautiful solution. :-) I will be stealing this.. ;-) I feel many of my problems are vaccum petcock related.....
 
Thanks Tim(HISPL). Maybe over the winter I'll modiify mine per your instructions. It would be nice to have a reserve.
 
Awesome MOD idea HiSPL!!!
wish I had seen this before I got my pingle so many months ago. Ah well, pingles rock anyway.
Thanks though. This idea will benefit many up and coming Gs'ers.

:)
Dm of mD
 
Yeah, I tried it as a last ditch effort before buying a pingle. To my surprise, it has worked out really well.

I guess I'm just super cheap because I will try to McGuyver anything before buying new parts.... :lol:


Oh, yeah..... Don't forget to plug the vacuum port on your #2 carb.

Good Luck everybody
 
Thanks hispl thats exactly what I was hoping for. I'll be modding mine this weekend.
 
Another thing you can do is shorten the handle, file the stop so that you can turn the lever up -- OFF position
 
Thanks for the info Hispl, and sqdancer....

I hope to be doing this over the silly season as well as repainting the bike! :D
 
I'm going to jump in here and ask a few questions.(if I may)
What is the purpose of the vacuum fuel valve anyway?
Does this change effect performance?
And what should be done with the vacuum line at the carb after converting to gravity feed?
I've scrolled through a dozen or so tech pages and didn't see these questions asked...
The amount of info was geting me a little dizzy so I may have overlooked it or simply gave up looking for now... :) :)

SL
 
gravity petcocks never turn off unless you turn them off. vaccum petcocks have a diaphram which controls the actuall fuel valve. When you crank the engine in the morning, the vaccum developed opens this valve so fuel can flow. This means you never need to mess with the petcock. You just leave it on "run"

However, this doesn't always work the way its' designed. Smaller motors sometimes don't generate enough vaccum and the petcock can shut off during long durations of wide open throttle. Or the petcock can get gummy and not react well, or open fully.

They are a nifty item. But frequently are the cause of anoyance to riders. :-)
 
snvlynch said:
I'm going to jump in here and ask a few questions.(if I may)
What is the purpose of the vacuum fuel valve anyway?

=== When working correctly automatically opens when engine is cranked and running then closes when engine is shut off.

Does this change effect performance?
==== No

And what should be done with the vacuum line at the carb after converting to gravity feed?

==== line has to be plugged.

I've scrolled through a dozen or so tech pages and didn't see these questions asked...
The amount of info was geting me a little dizzy so I may have overlooked it or simply gave up looking for now... :) :)

SL
Click to expand...
 
HiSPL said:
If you open it up and take the diaphragm and spring stuff out, you can easily convert it like I did.

Take out the selector barrel and figure out which of the two holes is used for "prime".

Fill that hole with JBWeld. Be careful to only fill that hole, and don't get any on the exterior of the barrel. Let dry overnight.

Put the barrel back in.

Use Form-a-gasket or something similar when you put the rear cap (vacuum cap) back on. This area will be flooded with gas after the mod.

Cap the vacuum line nipple with something fuel resistant. You could also stuff it full of JBWeld for a permanant solution.


Doing this mod will let you use the stock petcock as a manual system while still retaining the reserve function. Turning the switch to "prime" now shuts off the fuel. I have been using it this way for 3 years now with no problems.

Good luck....
Click to expand...

This is an old post that came up in a search. I've been having all kinds of problems with the vaccum system on my 1980 GS850L. I saw this post and it seems like a great solution but I opened up my petcock and I can't tell which parts are referenced in this fix and I'm wondering if I just have a different petcock? Here's mine:
petcock1.jpg
 
1980 you may have the petcock with the screwdriver slot!! If so REPLACE IT
 
It does which is the bane of my existence. I was having issues with it, replaced it with NOS but started having problems again after while. Also, why they made the screwdriver slot out of plastic with the same density of margarine is beyond me.

I'd drop cash on a pingel (or any other after-market) but I can't find a non-vaccum replacement for that year.
 
Hmm, looking at the adapter plates on Z1 wondering if they would work....
 
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