I got fed up with trying to get the fuel cock working properly on my GT500, so I made up a test rig out of a large coffee can which made it much easier to trouble shoot and test. I used a spacer block from a GT750 on the inside of the coffee can so I could get a good gasketed seal on both sides of the tin and rather than gasoline/petrol I used mineral spirit (varsol/paraffin) - its just a lot safer. You can get an auto-ignition due to static electric build up from gasoline flowing through fuel lines into a catch container (obviously when testing you don't want it all over the floor) which could put a serious cramp in your day. I suppose you could use water, but then you'd have to get the valve dry before commissioning.
After a bit of Rick's trick with the bamboo chop stick end to burnish the valve seat, the addition of a viton o-ring seal on the pintle, slight adjusting of the spring tension and new gaskets and seals, all is now good !
Fuel Cock Testing
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- oldjapanesebikes
- Moto GP
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Fuel Cock Testing
Ian
If at first you don't succeed, just get a bigger hammer !
If at first you don't succeed, just get a bigger hammer !
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- Yeah Man, the Interstate
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Re: Fuel Cock Testing
Dis you replace the diaphragm too? Mine is from another bike the P.O. used. It is working OK, but Iam looking to the future when it will be necessary for a re-build.
- Coyote
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Re: Fuel Cock Testing
I did the very same thing years ago when rebuilding a GS1000 petcock. I use a model airplane fuel bulb to pull a vacuum, but lung power also works. I used plain old isopropyl (rubbing) alcohol for the test fluid. It's thinner than water and can be followed with gasoline immediately.
For those who don't know, a GS1000 (78 -79) petcock will work on a GT tank. The bolt pattern is the same. Single vacuum and single outlet.
For those who don't know, a GS1000 (78 -79) petcock will work on a GT tank. The bolt pattern is the same. Single vacuum and single outlet.
I was born with nothing and still have most of it left.
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1978 GS1000C
1976 GT550 ongoing money pit.
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1978 GS1000C
1976 GT550 ongoing money pit.
- oldjapanesebikes
- Moto GP
- Posts: 3229
- Joined: Sat Feb 07, 2009 12:43 am
- Country: Canada
- Suzuki 2-Strokes: GT750(Jx3,L,M,A,B),T500
- Location: Ontario
- Contact:
Re: Fuel Cock Testing
No - I was lucky enough to be able to use the old diaphragm. I do Like Coyote's idea though - full rebuild kits for those, complete with diaphragms (!!!) are easy to locate.rbond wrote:Dis you replace the diaphragm too? Mine is from another bike the P.O. used. It is working OK, but Iam looking to the future when it will be necessary for a re-build.
Ian
If at first you don't succeed, just get a bigger hammer !
If at first you don't succeed, just get a bigger hammer !