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Petcock grub screws 1970 Lightning #698002
06/10/17 1:35 am
06/10/17 1:35 am
Joined: Aug 2001
Posts: 2,404
SLO County, CA
D.Bachtel Offline OP
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D.Bachtel  Offline OP
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Joined: Aug 2001
Posts: 2,404
SLO County, CA
Lost a grub screw and have no more spares.
Ewarts push pull 1970 Lightning. Stock petcocks.

Does anyone know what size they are? I'm guessing they're 6BA. My simple major diameter measure of the one from the other side is .110 inch.
I've yet to confirm the 47.9 TPI That's gunna take some bench top magnification and very steady hands.

Anyone have replacements?


Don in Nipomo

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Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698023
06/10/17 8:58 am
06/10/17 8:58 am
Joined: Aug 2001
Posts: 3,789
argyll. scotland, uk
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
Posts: 3,789
argyll. scotland, uk
I have a selection box of old Ewarts taps,, if no one your side of the pond has anything could post one over.
The screw in question only has two visible threads , 3.5 mm major OD, with a minor diam pin of 2.2 mm which engages the plunger, using the thread gauge is a bust with only 2 threads to gauge by. I gave up on these taps years ago so they are buckshee.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698045
06/10/17 4:21 pm
06/10/17 4:21 pm
Joined: Aug 2001
Posts: 2,404
SLO County, CA
D.Bachtel Offline OP
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D.Bachtel  Offline OP
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Joined: Aug 2001
Posts: 2,404
SLO County, CA
Buckshee... new to me.

Looking thru my spares for other bikes I do have some extra screws but they are the wrong size. . .136 diameter vs the .110.
I may have swapped these petcocks out for aftermarkets back in the 90s, hard to remember.
They also don't have the reduced shank pip to engage the groove.
I'm going to the hardware store to see if they are small metrics. Japanese patterned parts perhaps.

They have been leak free and easily operable over the years, just a little troublesome when the entire plunger comes out and flows gas all over the head.

I'll gladly take any screws or petcock carcasses you are willing to send stateside Gavin. Thanks for the offer.


Don in Nipomo

Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698050
06/10/17 4:34 pm
06/10/17 4:34 pm
Joined: Jun 2002
Posts: 9,795
Scotland
S
Stuart Online content
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Stuart  Online Content
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S
Joined: Jun 2002
Posts: 9,795
Scotland
Hi Don,

Originally Posted by D.Bachtel
Buckshee... new to me.

It's an English corruption of the Middle Eastern/Indian "baksheesh" or similar which, as well as meaning 'tip' or 'donation', also means 'bribe' ... whistle

Hth,

Regards,

Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698053
06/10/17 5:26 pm
06/10/17 5:26 pm
Joined: Apr 2006
Posts: 1,397
New Zealand
J
johnm Offline
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johnm  Offline
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J
Joined: Apr 2006
Posts: 1,397
New Zealand
Baksheesh

Commonly used by my fathers generation by the guys who returned from the war in North Africa

Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698059
06/10/17 6:04 pm
06/10/17 6:04 pm
Joined: Aug 2001
Posts: 3,789
argyll. scotland, uk
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
Posts: 3,789
argyll. scotland, uk
"Buckshee," free and un -needed in Scots./ English as well.

I once had a plunger come free when the screw had rattled out, had to ride 40 miles in a snowstorm with one hand on the tap to keep the fuel in, most unpleasant, PM me and I will send one over if you draw a blank stateside. Not my favourite taps!

Last edited by gavin eisler; 06/10/17 6:10 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698065
06/10/17 6:54 pm
06/10/17 6:54 pm
Joined: Aug 2001
Posts: 2,404
SLO County, CA
D.Bachtel Offline OP
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D.Bachtel  Offline OP
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Joined: Aug 2001
Posts: 2,404
SLO County, CA
....and I thought it just meant deershit.

Got my 1980 Cushman Turf Truckster running again after 3 weeks of fumbling around.
OMC 897ccs of aircooled boxer, three on the tree hi-lo and a PTO 1000lb. dumpbox. Three wheel crazy!

So down to the hardware store for free Saturday popcorn and a pick thru their fastener cabinets I go!


Don in Nipomo

Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698068
06/10/17 7:02 pm
06/10/17 7:02 pm
Joined: Aug 2001
Posts: 2,404
SLO County, CA
D.Bachtel Offline OP
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D.Bachtel  Offline OP
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Joined: Aug 2001
Posts: 2,404
SLO County, CA
I'll start in the 3mm drawer..

Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698070
06/10/17 8:00 pm
06/10/17 8:00 pm
Joined: Aug 2015
Posts: 1,108
Bolton Lancs UK
A
Andy Higham Offline
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Andy Higham  Offline
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A
Joined: Aug 2015
Posts: 1,108
Bolton Lancs UK
I had the push pull taps on my A10 years ago.
They are in my opinion not fit for purpose, the reserve tap would occasionally vibrate open with the possibility of no fuel. The main tap would regularly vibrate closed when giving it the berries


1955 BSA B31 500cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350
1967 Greeves 360 Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
Re: Petcock grub screws 1970 Lightning [Re: johnm] #698073
06/10/17 8:07 pm
06/10/17 8:07 pm
Joined: Oct 2007
Posts: 1,535
Auckland NZ
Ignoramus Offline
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Ignoramus  Offline
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Joined: Oct 2007
Posts: 1,535
Auckland NZ
Originally Posted by johnm
Baksheesh

Commonly used by my fathers generation by the guys who returned from the war in North Africa


My old man used to say it as well . He was with Australian army in north africa too


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698089
06/10/17 10:57 pm
06/10/17 10:57 pm
Joined: Aug 2001
Posts: 2,404
SLO County, CA
D.Bachtel Offline OP
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D.Bachtel  Offline OP
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Joined: Aug 2001
Posts: 2,404
SLO County, CA
Not 3mm but 4-40 machine screws. Phillips with flat and internal star washer. Very short. Just a smear of blue thread locker. I should be good for a decade.

Nothing really wrong with the push/pulls (patterned or not) unless you just can't make them work. Mine do.


Don in Nipomo

Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel] #698120
06/11/17 8:44 am
06/11/17 8:44 am
Joined: May 2013
Posts: 4,819
Rotherham - S. Yorkshire
Allan Gill Online happy

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Allan Gill  Online Happy

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Joined: May 2013
Posts: 4,819
Rotherham - S. Yorkshire
Originally Posted by D.Bachtel
Not 3mm but 4-40 machine screws. Phillips with flat and internal star washer. Very short. Just a smear of blue thread locker. I should be good for a decade.

Nothing really wrong with the push/pulls (patterned or not) unless you just can't make them work. Mine do.


Don in Nipomo


Plus one! Mine work a treat and prefer them to lever taps. If they can rattle in and out then the cork is drying out (lack of use I've found) drop them in some boiling water, squeeze out the excess and refit and you haveadry and leak free tap, which doesn't rattle in and out.


beerchug

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