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Amal Pilot Jet #720252
12/28/17 3:08 pm
12/28/17 3:08 pm
Joined: Nov 2015
Posts: 8
USA
T
Thunderlizard Offline OP
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Thunderlizard  Offline OP
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Joined: Nov 2015
Posts: 8
USA
Hello, I am working on an AMAL 928 for a single carb BSA A65. it has the removable pilot jet under the rim of the float bowl. I have read that this was changed to the fixed orifice behind the air bleed screw due to issues with the location of the removable jet.

How much of an issue is the removable jet, is it worth rebuilding this carb or should I look for one with the fixed orifice?

thanks for your help,
Randy

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Re: Amal Pilot Jet [Re: Thunderlizard] #720254
12/28/17 4:13 pm
12/28/17 4:13 pm
Joined: Dec 2004
Posts: 9,228
Scotland
kommando Online content
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kommando  Online Content
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Joined: Dec 2004
Posts: 9,228
Scotland
The position of the pilot jet in the float bowel area was suited to 2 stokes, the pilot bush was suited to 4 strokes but how much improvement you got from the change differed from engine to engine with Triumph 500's showing the biggest improvement. If you don't have any issues carb wise currently then leave as is.

Re: Amal Pilot Jet [Re: Thunderlizard] #720258
12/28/17 4:37 pm
12/28/17 4:37 pm
Joined: Feb 2008
Posts: 4,255
New Jersey USA
Tridentman Offline

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Tridentman  Offline

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New Jersey USA
+1 with Kommando.
I would advise making the decision ref possible carb replacement based on the overall condition of the carb--not just the pilot jet position.
If the carb is the original one--as it sounds as if it might well be--then look carefully at bore wear. fit of slide in body etc etc.
You will also certainly need a new needle and needle jet.
In figuring out exactly what you need to refurb the existing carb and how much it costs you could well find that you are close to the price of a new Premier carb-- which should solve all carb issues at a stroke (only one stroke!--no pun intended!).
HTH

Re: Amal Pilot Jet [Re: Thunderlizard] #720259
12/28/17 4:38 pm
12/28/17 4:38 pm
Joined: Mar 2005
Posts: 10,084
Boston, Massachusetts
J
John Healy Offline
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John Healy  Offline
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Joined: Mar 2005
Posts: 10,084
Boston, Massachusetts
As Kommando stated, but before you go running off check the body and see if there is an other pilot jet pressed into the body. People add the second jet thinking it is missing. Several aftermarket manuals illustrate the screwed in jet and confuse people.
Also the screwed in jet could have been screwed in after the original pressed in jet was enlarged too big. This can happen while poking to clean it out or intentionally.


Re: Amal Pilot Jet [Re: Thunderlizard] #720271
12/28/17 6:17 pm
12/28/17 6:17 pm
Joined: May 2013
Posts: 4,765
Rotherham - S. Yorkshire
Allan Gill Offline

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Allan Gill  Offline

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Rotherham - S. Yorkshire
They also don’t run right if you have a perfectly fine pressed in jet and a screwed in jet.

I used to find the engine wanted to die when shutting off with the screw in jet, the presses in jet sorted this. The premier carb is a nice upgrade!


beerchug
Re: Amal Pilot Jet [Re: Thunderlizard] #720295
12/28/17 9:00 pm
12/28/17 9:00 pm
Joined: Aug 2015
Posts: 1,089
Bolton Lancs UK
A
Andy Higham Offline
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Andy Higham  Offline
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A
Joined: Aug 2015
Posts: 1,089
Bolton Lancs UK
When checking the carb for wear first look at the slide, it will show wear marks on the front and back. AMAL concentrics had rather a lot of play in the slides when they were new


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: Amal Pilot Jet [Re: Andy Higham] #720299
12/28/17 9:49 pm
12/28/17 9:49 pm
Joined: Nov 2015
Posts: 8
USA
T
Thunderlizard Offline OP
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Thunderlizard  Offline OP
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Joined: Nov 2015
Posts: 8
USA
Thank you for the responses. the carb is original to the bike, it had about 5K miles on it when it went out of service. I never heard the bike run. it now has a 71 tbolt engine in it.

the carb does not have the pressed in idle jet only the threaded one and as I understand it that's how they came in 68. the flange is straight, slide is a fairly good fit with some scratches but definitely serviceable. all parts are in pretty good shape.

I would have headed straight for a new carb but I already have all of the parts to rebuild this one, just need to know if it is going to give me idle and low speed problems with the screw in jet vs the pressed in one.

is it possible to get the pressed in jet and install it in this carb?

Randy

Last edited by Thunderlizard; 12/28/17 10:02 pm.
Re: Amal Pilot Jet [Re: Thunderlizard] #720309
12/28/17 11:09 pm
12/28/17 11:09 pm
Joined: Dec 2004
Posts: 9,228
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
BritBike Forum member
Joined: Dec 2004
Posts: 9,228
Scotland
Pilot Restricting Jet - Non-Changeable
Product No: 622/107
Out of stock on Snaps site but others may have it.

Re: Amal Pilot Jet [Re: Thunderlizard] #720317
12/29/17 12:35 am
12/29/17 12:35 am
Joined: Oct 2017
Posts: 72
MA
N
Nick H Offline
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Nick H  Offline
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N
Joined: Oct 2017
Posts: 72
MA
Isn't it true that the new Premier's located the pilot jet back in the original over the float bowl position?


1966 BSA Lightning
1967 Triumph "Choppa"
Re: Amal Pilot Jet [Re: Thunderlizard] #720318
12/29/17 12:43 am
12/29/17 12:43 am
Joined: Mar 2005
Posts: 10,084
Boston, Massachusetts
J
John Healy Offline
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John Healy  Offline
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J
Joined: Mar 2005
Posts: 10,084
Boston, Massachusetts
No!


Re: Amal Pilot Jet [Re: NickL] #720351
12/29/17 9:35 am
12/29/17 9:35 am
Joined: Aug 2001
Posts: 7,305
scotland
triton thrasher Online content
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triton thrasher  Online Content
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Posts: 7,305
scotland
Originally Posted by NickL
No, they just made it accessible by fitting another screw in the opposite side to the mixture adjustment screw.



No they fitted a removeable jet in the opposite side from the adjuster screw.

[Linked Image]


Amateur Loctite enthusiast.
Re: Amal Pilot Jet [Re: Thunderlizard] #720373
12/29/17 12:39 pm
12/29/17 12:39 pm
Joined: Aug 2001
Posts: 1,573
Jordan, NY
Al Eckstadt Offline

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Al Eckstadt  Offline

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Jordan, NY
I have a pair of Amals sleeved by Mike Gaylord (Thanks Mike, RIP) back in the 1980's. They have the early removable pilot jet. No idle problems, no stalling, and the air mixture adjusts easily. Since you have the parts, I would want to rebuild it and try it. Check (measure) the pilot jet and other parts carefully before installing.

I would not recommend sleeving today - but I won't post why... you'll have to PM me for the story.


Al Eckstadt
Re: Amal Pilot Jet [Re: Thunderlizard] #720383
12/29/17 3:23 pm
12/29/17 3:23 pm
Joined: Nov 2015
Posts: 8
USA
T
Thunderlizard Offline OP
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Joined: Nov 2015
Posts: 8
USA
The carb bore, slide, and flange are all in good shape, I'm going to give it a try. If I don't like it, a new one is easy enough to get. thanks for all of your input.

Re: Amal Pilot Jet [Re: Thunderlizard] #720385
12/29/17 3:40 pm
12/29/17 3:40 pm
Joined: Dec 2004
Posts: 9,228
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
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Posts: 9,228
Scotland
When I find a good body with little or no wear then I always fit either a chromed or anodised slide as that removes the cause of the rapid wear concentrics suffer from. AMAL's own attempt at chromed pot metal slides failed but Surrey Cycles version works as its chrome on brass.

Re: Amal Pilot Jet [Re: Thunderlizard] #720386
12/29/17 3:49 pm
12/29/17 3:49 pm
Joined: Mar 2005
Posts: 10,084
Boston, Massachusetts
J
John Healy Offline
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John Healy  Offline
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Joined: Mar 2005
Posts: 10,084
Boston, Massachusetts
Quote
Surrey Cycles version


Actually Chris Williams - Autocycle version.


Re: Amal Pilot Jet [Re: Thunderlizard] #720387
12/29/17 4:03 pm
12/29/17 4:03 pm
Joined: Dec 2004
Posts: 9,228
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
BritBike Forum member
Joined: Dec 2004
Posts: 9,228
Scotland
Good to know.

Re: Amal Pilot Jet [Re: triton thrasher] #720667
12/31/17 11:23 pm
12/31/17 11:23 pm
Joined: Jan 2014
Posts: 3,677
Aus
N
NickL Offline
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NickL  Offline
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Joined: Jan 2014
Posts: 3,677
Aus
Originally Posted by triton thrasher
Originally Posted by NickL
No, they just made it accessible by fitting another screw in the opposite side to the mixture adjustment screw.



No they fitted a removeable jet in the opposite side from the adjuster screw.

[Linked Image]



Frightfully sorry about the mistake, thank you for correcting me old chap.




Moderated by  Alan_nc 


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