My carb fell off. Oof.

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jaydee75 said:
Probably not original, but I'm pretty sure 10-32 screws will hold the bowls on, IIRC.
Jaydee
Click to expand...
They do fit and can be used, the 2BA fasteners are the proper fasteners, I suggest socket heads (Allen's, if you prefer).

From the looks of the pictures offered by the OP I'd venture that these carbs are good candidates for the bin. The fuel line alone looks like it wouldn't take much to cause it to shatter, as opposed to simply break. So why go through sending good money after bad? hat I see leads me to think that if what I see is any indication what I can't see...

If I missed something let me apologize.

Best.
 
RoadScholar said:
From the looks of the pictures offered by the OP I'd venture that these carbs are good candidates for the bin. The fuel line alone looks like it wouldn't take much to cause it to shatter, as opposed to simply break. So why go through sending good money after bad?
Click to expand...

Did you see something on the carbs specifically that looks like they're ready for replacement? It was in storage for about 13 years before I got it a bit ago and got it running again. Not shy about getting new ones, but wondering if you saw something specific.

The fuel lines are actually new. I guess they sell them with a vintage patina. ;)
 
Nortorious said:
Did you see something on the carbs specifically that looks like they're ready for replacement? It was in storage for about 13 years before I got it a bit ago and got it running again. Not shy about getting new ones, but wondering if you saw something specific.

The fuel lines are actually new. I guess they sell them with a vintage patina. ;)
Click to expand...
Maybe x-ray vision? :D :D :D
 
Nortorious said:
It was in storage for about 13 years before I got it a bit ago and got it running again.
Click to expand...

The Premier carbs weren't introduced until October 2011 so the "New Amal Premeire[Premier] 932 anodized slide, adj float..." parts the PO fitted must have occurred sometime during the storage. I guess he must have forgotten that he hadn't fitted the float bowl gaskets.
 
L.A.B. said:
The Premier carbs weren't introduced until October 2011 so the "New Amal Premeire[Premier] 932 anodized slide, adj float..." parts the PO fitted must have occurred sometime during the storage. I guess he must have forgotten that he hadn't fitted the float bowl gaskets.
Click to expand...

As you noted, the fit and function is really off without the gaskets. The BA2 bowl screws actually peek out the top a bit because they are too long without the gaskets. I'm really looking forward to getting those added and seeing how they perform. I've been struggling with this for over a year and thought it had to do with altitude, wrong jet sizes, or some other tuning and I've spent hours and hours trying to get it right and followed all of Bushman's tips. Hopefully this is the missing part of the puzzle..
 
Nortorious said:
As you noted, the fit and function is really off without the gaskets. The BA2 bowl screws actually peek out the top a bit because they are too long without the gaskets. I'm really looking forward to getting those added and seeing how they perform. I've been struggling with this for over a year and thought it had to do with altitude, wrong jet sizes, or some other tuning and I've spent hours and hours trying to get it right and followed all of Bushman's tips. Hopefully this is the missing part of the puzzle..
Click to expand...

Yes, apart from the leakage of fuel out of the bowl then with no gasket, air is likely to be drawn into the float bowl instead of through the intake gallery to the needle jet cavity (lower arrow) probably upsetting the mixture...
My carb fell off. Oof.


...also enter the pilot feed drilling (red) at the float bowl joint that should be lifting neat fuel from the float bowl.
My carb fell off. Oof.
 
IMO- there's no need to bin your bike's matching original UK-built carbs for what I suspect are made-in-china replacements.
And FWIW, all new fuel lines seem to turn yellow with today's fuel.
 
Last edited:
Nortorious said:
Did you see something on the carbs specifically that looks like they're ready for replacement? It was in storage for about 13 years before I got it a bit ago and got it running again. Not shy about getting new ones, but wondering if you saw something specific.

The fuel lines are actually new. I guess they sell them with a vintage patina.
Click to expand...
As I wrote earlier
RoadScholar said:
If I missed something let me apologize.
Click to expand...

best
 
L.A.B. said:
Yes, apart from the leakage of fuel out of the bowl then with no gasket, air is likely to be drawn into the float bowl instead of through the intake gallery to the needle jet cavity (lower arrow) probably upsetting the mixture...
My carb fell off. Oof.


...also enter the pilot feed drilling (red) at the float bowl joint that should be lifting neat fuel from the float bowl.
My carb fell off. Oof.
Click to expand...
Those are nice illustrations. Where are they from?
 
A similar issue:
A stretch of empty road near home and at the end of a ride tempted me to run flat-out and see if the "ton" was still there. It was but when I let off the throttle it started running like crap on one so I headed for home wondering what let go. As I pulled into my drive I noticed my leg was getting soaked with gas. One drain plug had backed out, a first for me. They're now drilled and safety wired.

If far from home I would have stopped and investigated and likely fabricated some temporary stopper.
 
JimNH said:
A similar issue:
A stretch of empty road near home and at the end of a ride tempted me to run flat-out and see if the "ton" was still there. It was but when I let off the throttle it started running like crap on one so I headed for home wondering what let go. As I pulled into my drive I noticed my leg was getting soaked with gas. One drain plug had backed out, a first for me. They're now drilled and safety wired.

If far from home I would have stopped and investigated and likely fabricated some temporary stopper.
Click to expand...
Sometimes limping in is the best option....
Made it to .10 cent chicken wing night ON TIME to see friends!
My carb fell off. Oof.
My carb fell off. Oof.
My carb fell off. Oof.
 
L.A.B. said:
Yes, apart from the leakage of fuel out of the bowl then with no gasket, air is likely to be drawn into the float bowl instead of through the intake gallery to the needle jet cavity (lower arrow) probably upsetting the mixture...
My carb fell off. Oof.


...also enter the pilot feed drilling (red) at the float bowl joint that should be lifting neat fuel from the float bowl.
My carb fell off. Oof.
Click to expand...
Whole books have been written that say less than these two drawings. Thanks LAB
 
Thomasa said:
Whole books have been written that say less than these two drawings. Thanks LAB
Click to expand...
On the second diagram, if I enlarge it enough I see the air arrow (black) points down into the first tiny pilot hole, just before the choke gap, where it mixes with fuel at pilot jet and exits post choke gap into airstream. This means the hole handles air or air/fuel mixture in different directions depending on use of choke. Perhaps that helps to clean the hole of debris if choke is in regular use?
 
Tornado said:
On the second diagram, if I enlarge it enough I see the air arrow (black) points down into the first tiny pilot hole, just before the choke gap, where it mixes with fuel at pilot jet and exits post choke gap into airstream. This means the hole handles air or air/fuel mixture in different directions depending on use of choke. Perhaps that helps to clean the hole of debris if choke is in regular use?
Click to expand...

"Choke gap"

Slide gap?

Vintage Bike Magazine » Amal – A comprehensive look

vintagebikemagazine.com vintagebikemagazine.com
"
• There are two small idle circuit transfer ports adjacent to the back edge of the slide. The smaller, Primary, transfer hole is 0.027″ while the Secondary is 0.040″.
• It is the Primary transfer port (smaller) that supports idle and transition between idle and main carburetors.
• The Secondary (larger) has two functions. At idle it feeds additional air into the mixing chamber. The change in vacuum as [the] slide just lifts from idle reverses the flow through the Secondary port. It now instead of passing air into the mixing chamber it draws additional fuel into the venturi. This [a]dditional fule[fuel] helps to make the transfer from the idle carburetor to the main carburetor smoother. It is equivelent of the accelerator pump."
 
L.A.B. said:
"Choke gap"

Slide gap?

Vintage Bike Magazine » Amal – A comprehensive look

vintagebikemagazine.com vintagebikemagazine.com
"
• There are two small idle circuit transfer ports adjacent to the back edge of the slide. The smaller, Primary, transfer hole is 0.027″ while the Secondary is 0.040″.
• It is the Primary transfer port (smaller) that supports idle and transition between idle and main carburetors.
• The Secondary (larger) has two functions. At idle it feeds additional air into the mixing chamber. The change in vacuum as [the] slide just lifts from idle reverses the flow through the Secondary port. It now instead of passing air into the mixing chamber it draws additional fuel into the venturi. This [a]dditional fule[fuel] helps to make the transfer from the idle carburetor to the main carburetor smoother. It is equivelent of the accelerator pump."
Click to expand...
Thanks for clarifying...indeed the blue "lip" I thought was the choke is in fact the throttle slide, being shown at idle and also more open in the two diagrams. So the secondary hole does change flow direction from idle to above idle.
 
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