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A65 plunger petcock O-rings too tight #719860
12/23/17 11:26 pm
12/23/17 11:26 pm
Joined: Apr 2002
Posts: 716
Out There!
N
Nick Offline OP
BritBike Forum member
Nick  Offline OP
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N
Joined: Apr 2002
Posts: 716
Out There!
Installed aftermarket O-ring plungers in stock A65 push-pull petcocks but they are way too tight. Can one fit slightly smaller O-rings? Any tips for honing out the petcocks? Etc.

Thanks.


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Re: A65 plunger petcock O-rings too tight [Re: Nick] #719887
12/24/17 3:22 am
12/24/17 3:22 am
Joined: Dec 2002
Posts: 3,252
arkansas
L
leon bee Offline
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leon bee  Offline
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Joined: Dec 2002
Posts: 3,252
arkansas
I've got a lot of those petcocks on bikes, but I know little about that conversion. I sold a ratty Lightning to a young friend of mine, he has a hard time staying on top of the corks. Somewhere he bought the o-ring conversion, hasn't messed with it yet. I didn't check it out, but when he showed me the package there was a twist drill included. So for that kit, anyway, you are expected drill out the bore of the petcock.

Edit: I looked at those kits today and I had it completely wrong. The include twist drills are to drill the original pulls to fit on the new plunger spindles.

I had hoped your question would elicit some relevant comment. I viable substitute for those corks would be a good thing for those of us who prefer the original petcocks.

Last edited by leon bee; 12/31/17 4:42 am.
Re: A65 plunger petcock O-rings too tight [Re: Nick] #719904
12/24/17 11:54 am
12/24/17 11:54 am
Joined: Aug 2001
Posts: 3,919
argyll. scotland, uk
gavin eisler Offline
BritBike Forum member
gavin eisler  Offline
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Joined: Aug 2001
Posts: 3,919
argyll. scotland, uk
i tried o rings in push / pull petrol taps years ago, gave up very quickly, the O rings swelled up and the taps became un useable, o rings may have improved since then , dunno. Ended up using taper cock style taps.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: A65 plunger petcock O-rings too tight [Re: Nick] #719971
12/25/17 11:10 am
12/25/17 11:10 am
Joined: Sep 2015
Posts: 312
Kent, England
J
John Alexander Offline
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John Alexander  Offline
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J
Joined: Sep 2015
Posts: 312
Kent, England
Had a problem with the the taper on the lever fuel type taps i bought for my Goldie [ indian made tank], the just got tighter and tighter to turn and also leaked, not good with a GP downdraught carb, the fuel would flow from the needle jet, straight into the engine cylinder over time. Bought a pair of triumph 500/650 taps from Richard Hacker in the UK, though no longer in business, problem solved.
Goldie John

Re: A65 plunger petcock O-rings too tight [Re: Nick] #719990
12/25/17 5:35 pm
12/25/17 5:35 pm
Joined: Mar 2005
Posts: 10,158
Boston, Massachusetts
J
John Healy Offline
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John Healy  Offline
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J
Joined: Mar 2005
Posts: 10,158
Boston, Massachusetts
Those of you who fly light aircraft might be aware of a product called EzTurn sold by Aircraft Spruce. It works well on both petcock "O" rings and tapered brass petcocks. Remember the bit about alcohol being good at remove all traces of oil and grease when you are trying to seal up cases? Well over time the alcohol in the gasoline does the same thing to "O" ring and tapered brass petcocks. A treatment with EzTurn will last about a year.


Re: A65 plunger petcock O-rings too tight [Re: Nick] #720001
12/25/17 7:34 pm
12/25/17 7:34 pm
Joined: May 2013
Posts: 4,847
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Joined: May 2013
Posts: 4,847
Rotherham - S. Yorkshire
Never have a big problem wth the corks. Eventually they leak (shrink) so remove and drop into boiling water, let them swell and keep them in there until all the air bubbles leave the cork. Squeeze all the water out and refit and it lasts another 2-3 years or more. I found same works with new cork taps.


beerchug
Re: A65 plunger petcock O-rings too tight [Re: Allan Gill] #720023
12/26/17 9:05 am
12/26/17 9:05 am
Joined: Feb 2012
Posts: 203
UK Tyne & Wear
P
photobob Offline
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photobob  Offline
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Joined: Feb 2012
Posts: 203
UK Tyne & Wear
I agree with Alan Gill on this I have tried the o rings and they were ok for about 3 months then they became too tight so went back to the corks, the corks last me at least 3 years sometimes a lot longer it depends I think on the grain structure in the cork some corks are quite coarse and they do not last as long but for the negligible cost of the corks I will stick to them, I always have a spare plunger with a new cork fitted lying in glass jar with a screw top lid on it with about an inch of petrol so always have one to hand because when they do eventually start to leak it always happens at the wrong time never when the bike is laid up over the winter.

Re: A65 plunger petcock O-rings too tight [Re: Nick] #720035
12/26/17 4:56 pm
12/26/17 4:56 pm
Joined: May 2013
Posts: 4,847
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Joined: May 2013
Posts: 4,847
Rotherham - S. Yorkshire
It always the wrong time. Mine leaked after 4 good years of service at the international this year, pretty bad too. So bought a new plunger, tried fitting it dry and that was a bad idea, should have just soaked the old one in an old jam jar but least now I have a spare.


beerchug
Re: A65 plunger petcock O-rings too tight [Re: Nick] #720874
01/02/18 4:59 pm
01/02/18 4:59 pm
Joined: Jan 2012
Posts: 338
florida
L
LeonGustus Offline
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LeonGustus  Offline
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Joined: Jan 2012
Posts: 338
florida
about 6 years ago I did some experiments with using synthetic wine corks to replace ewarts corks. If one looks at the thread "ewarts cork leaks" about halfway though I talk about using a dremal as a lathe to make new ethanol proof corks. Am still happy with the ones I made back then. I was never able to get o-rings to last on the long-term. There seems to be a never ending supply of wine corks at my house but ive never had to make another pair. Cheers!


October of 69-A50R
Re: A65 plunger petcock O-rings too tight [Re: Nick] #720902
01/02/18 10:28 pm
01/02/18 10:28 pm
Joined: Feb 2014
Posts: 1,098
Lancaster, California
C.B.S Offline

Parts Dealer
C.B.S  Offline

Parts Dealer
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Posts: 1,098
Lancaster, California


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