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Just about had it with my Petcock

  • Thread starter Thread starter MOC
  • Start date Start date
MOC said:
had a break in last night, and i've been spending my time/money sorting out our security issues here at the house.

thanks as usual for the feedback fellas.
Click to expand...

If it weren't for bad luck you wouldn't have any luck at all.
Maybe they were after your petcock :D
Hopefully things will start turning around for you.
 
Bite the the bullet go to Suzuki and buy a new one and be done w it.
 
I'm worried that the design of my petcock lends itself to this kind of failure. if i replace all the moving parts, and the damn thing STILL leaks, i am concerned that an identical replacement would end up doing the same thing.

with that said, the petcock on my bike right now is basically this one:

http://www.ebay.com/itm/New-Fuel-Pe...ies&fits=Model:GS&hash=item3f247a30db&vxp=mtr

I wouldn't buy it at that price, but am I barking up the correct tree here? Factory stock replacement? like i said, i'd like to keep my investments modest if possible, but if this improves the value of the bike in the long run i may bite the proverbial bullet.
 
MOC said:
I'm worried that the design of my petcock lends itself to this kind of failure. if i replace all the moving parts, and the damn thing STILL leaks, i am concerned that an identical replacement would end up doing the same thing.

with that said, the petcock on my bike right now is basically this one:

http://www.ebay.com/itm/New-Fuel-Pe...ies&fits=Model:GS&hash=item3f247a30db&vxp=mtr

I wouldn't buy it at that price, but am I barking up the correct tree here? Factory stock replacement? like i said, i'd like to keep my investments modest if possible, but if this improves the value of the bike in the long run i may bite the proverbial bullet.
Click to expand...

I know it's expensive at $99. It could be worse. A '78, '79 GS1000 petcock new will cost you $267 and change plus shipping!
Item 1-1 on this fiche.
http://www.boulevardsuzuki.com/fich...y=Motorcycles&make=SUZUKI&year=1978&fveh=2146

Therefore I had to rebuild several of mine. I got all working save one which I used for parts. Problem is there's several things that can make them leak, like that itty bitty O-ring on the diaphram, that what you get in the kits are too small. Also there's a 4 holed selector ring that gets squished and hard and doesn't seal properly under the selector lever.
$(KGrHqZ,!nQE8YsZeeeiBPN!BKirHw~~60_12.JPG


Plus, there's a breather hole that gets plugged up on the outside of the petcock and gets clogged and won't let your petcock breathe, keeps the fuel flowing so to speak. This hole aligns with the holes in the diaphram and the block the diaphram sits in between.

Of course there's always that possibility you could use as a last resort that I put in one of my other posts to you. I can't gaurantee it'll work, but others have done it. You file off that physical stop that keeps the selector from pointing straight up, and you might have to shorten your selector handle so it will clear the tank. But it's supposed to stop fuel from flowing with the selector switch pointing straight up.
 
the more i think about it, the more i think you guys are right about that rebuild kit and the piston in it. i'm going to have a look at it when i get home. i'm also liking the idea that the breather hole on the back of the diaphragm is plugged for some reason. one of my symptoms is that the petcock is slow to return to Off after the bike is shut off (hence the need for blowing into the vac line).

the 4 holed gasket and seal around the selector valve worked great for fixing the leak out of the face of the petcock. it also helped to tighten that ring shaped leaf spring a smidge. now its just a slow drip out of the fuel port. I'm going to tear into it again and see if i can isolate the issue.

Also: I just picked up a new laptop so i should be able to cobble together some pictures/video of the issue if i can find time tonight or tomorrow.

thanks for the help fellas
 
MOC said:
the more i think about it, the more i think you guys are right about that rebuild kit and the piston in it. i'm going to have a look at it when i get home. i'm also liking the idea that the breather hole on the back of the diaphragm is plugged for some reason. one of my symptoms is that the petcock is slow to return to Off after the bike is shut off (hence the need for blowing into the vac line).

the 4 holed gasket and seal around the selector valve worked great for fixing the leak out of the face of the petcock. it also helped to tighten that ring shaped leaf spring a smidge. now its just a slow drip out of the fuel port. I'm going to tear into it again and see if i can isolate the issue.

Also: I just picked up a new laptop so i should be able to cobble together some pictures/video of the issue if i can find time tonight or tomorrow.

thanks for the help fellas
Click to expand...

The breather hole I'm talking about is on the front of the outside of the petcock and goes through the petcock housing and should align with the hole in the diaphram and the hole in the diaphram block. Here's a pic of the "hole" from my petcock taken moments ago.
It looks like just a tiny speck, but it is clearly visible, here's a clue, the shadow goes right accross the top of it. Can't see it yet, it's above the fuel nipple, on the front part of that square block the diaphram sits up against.
100_1848_zps38bd4d88.jpg


Anyways, before you do anything else, be sure to read this!
http://members.dslextreme.com/users/storagecliff1/images/suzuki_petcock_rebuild.pdf
 
yeah, i know exactly what you're talking about. there are holes in the replacement diaphragms that are supposed to line up with it. i need to make sure everything is clear.
 
This was my petcock testing station using a spare tank I had lying around.
Basically all you need to do is to have a "catch" tank to catch the fuel from when it flows. Fill your tank up enough to where it would normally flow in the "ON" position. Turn it to "Prime" and begin the flow, then to "On" and it should stop. Pour what flowed while it was in Prime back into the tank and put the hose back in and see if it stops flowing completely while left in the "On" position. If you don't have enough fuel for it to flow in "ON" you may get a false reading, therefore you can check it in "Reserve" also. Allot of people get the Prime and Reserve position mixed up, The petcock here is in the "Reserve" position.
100_0937.jpg
 
Ok fellas,

I got home from work and couldnt stop thinking about the fuel leak, so I got creative. This is the Last 2/3 of the process on video. I managed to forget to record the first part... whoops. Basically, I swapped some o rings and some gaskets around in the hopes that my problem would be solved. Sorry for the audio quality, my GoPro isn't the best camcorder for this kind of task.

http://www.youtube.com/watch?v=bwpwhXXF9EQ

cheers
 
when i get the time i am going to tear into the carbs. that is on my list of to-dos considering those are the only pieces inside the carbs i DIDNT replace when i rebuilt them in october.

I'm assuming that Z1 carries needles, needle seats, and seals for the 450. I'm replacing my front brake line with SS at some point, so when i get around to making that order, i'm buying carb parts as well.

thanks fellas
 
MOC said:
Ok fellas,

I got home from work and couldnt stop thinking about the fuel leak, so I got creative. This is the Last 2/3 of the process on video. I managed to forget to record the first part... whoops. Basically, I swapped some o rings and some gaskets around in the hopes that my problem would be solved. Sorry for the audio quality, my GoPro isn't the best camcorder for this kind of task.

http://www.youtube.com/watch?v=bwpwhXXF9EQ

cheers
Click to expand...

That was pretty good video, wish I could turn screws that fast!
One question "Does fuel flow when you suck on the vacuum line in the On and Reserve position then shut off when you stop?"
 
sedelen said:
That was pretty good video, wish I could turn screws that fast!
One question "Does fuel flow when you suck on the vacuum line in the On and Reserve position then shut off when you stop?"
Click to expand...

yes, it does. i couldn't really manage that demo while i was holding the camera, but i did check this and it does stop. Unfortunately, i saw the same thing with my first attempt at rebuilding these carbs, so i will remain skeptical until i see a few weeks of consistently good function out of this one.

i took the bike out last night after the rebuild for a test run and it did run fine with the ON and RES settings. i'm running on the assumption that i'm in the clear. i'll recheck tomorrow to see if there's any issues but as far as i can tell, it's working.

mike
 
MOC said:
yes, it does. i couldn't really manage that demo while i was holding the camera, but i did check this and it does stop. Unfortunately, i saw the same thing with my first attempt at rebuilding these carbs, so i will remain skeptical until i see a few weeks of consistently good function out of this one.

i took the bike out last night after the rebuild for a test run and it did run fine with the ON and RES settings. i'm running on the assumption that i'm in the clear. i'll recheck tomorrow to see if there's any issues but as far as i can tell, it's working.

mike
Click to expand...

I'm really glad to see a good ending to this. I know how frustrating those petcocks can be. It takes time and patience, and sometimes that's not enough either. Glad it worked out for you though.
 
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