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Don M.
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#698002 - 06/10/17 1:35 am Petcock grub screws 1970 Lightning  
Joined: Aug 2001
Posts: 2,402
D.Bachtel Online content
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D.Bachtel  Online Content
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Joined: Aug 2001
Posts: 2,402
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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#698023 - 06/10/17 8:58 am Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2001
Posts: 3,455
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
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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
#698045 - 06/10/17 4:21 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2001
Posts: 2,402
D.Bachtel Online content
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D.Bachtel  Online Content
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Joined: Aug 2001
Posts: 2,402
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

#698050 - 06/10/17 4:34 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Jun 2002
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Stuart Online content
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Stuart  Online Content
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Posts: 9,394
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,

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

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

#698059 - 06/10/17 6:04 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2001
Posts: 3,455
gavin eisler Offline
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gavin eisler  Offline
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Joined: Aug 2001
Posts: 3,455
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
#698065 - 06/10/17 6:54 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2001
Posts: 2,402
D.Bachtel Online content
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D.Bachtel  Online Content
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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

#698068 - 06/10/17 7:02 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2001
Posts: 2,402
D.Bachtel Online content
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D.Bachtel  Online Content
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Posts: 2,402
SLO County, CA
I'll start in the 3mm drawer..

#698070 - 06/10/17 8:00 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2015
Posts: 971
Andy Higham Online content
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Andy Higham  Online Content
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Posts: 971
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 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc grasstrack
2003 Aprilia RSV Mille "Lo Stregone"
#698073 - 06/10/17 8:07 pm Re: Petcock grub screws 1970 Lightning [Re: johnm]  
Joined: Oct 2007
Posts: 1,514
Ignoramus Online content
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Ignoramus  Online Content
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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)
#698089 - 06/10/17 10:57 pm Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: Aug 2001
Posts: 2,402
D.Bachtel Online content
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D.Bachtel  Online Content
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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

#698120 - 06/11/17 8:44 am Re: Petcock grub screws 1970 Lightning [Re: D.Bachtel]  
Joined: May 2013
Posts: 4,578
Allan Gill Online happy
Allan Gill  Online Happy


Joined: May 2013
Posts: 4,578
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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