Amal Slide Slop?

Tornado

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Just wondering, is any amount of play/slop of the Amal slide in the carb bore acceptable or must it be a nice smooth fit?

What is the going rate for re-sleeving these days?
 

Craig

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Uh-hum .... get yourself a single Mikuni or try a pair of 32’s ..... then you can worry on other stuff .... have a good Thanksgiving as well !
 

Tornado

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Been trying to solve a high idle. Slides not hanging, fully closing. I can dial out with mixture screws to around 900 or 1000 ok. But note when blipping throttle it takes a second or so to drop back down to previous rpm. Sometimes I find it creeping up to 11-1200 rpm when sitting at a light. Can't detect leaks at flanges.
 

Tornado

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I can feel a slight movement on the slide when trying to rock it with my finger. Just don't have any experience with new carbs to gauge this by.
 
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Been trying to solve a high idle. Slides not hanging, fully closing. I can dial out with mixture screws to around 900 or 1000 ok. But note when blipping throttle it takes a second or so to drop back down to previous rpm. Sometimes I find it creeping up to 11-1200 rpm when sitting at a light. Can't detect leaks at flanges.
What you say indicates (maybe) you have an idle set but the pilot circuit (air screw) is not set correctly. It takes 2 or 3 rotations of setting idle screw then air screw then idle screw.... etc to get the carbs dialled in so the idle (pilot) circuit gives a nice crisp response. If it then acts up off idle with a twist of the wrist adjust needle. Also of course you have to make sure idle circuit is clean and unobstructed, bain of Amal’s!
 
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What's the mileage ? Usually shot around 10,000. Higher mileages risk fracture of the slide(s) getting slurped into the motor and hopefully spit out the exhaust. Why risk it , start saving for upgrade carb(s).
 
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Hello!

I had the same behaviour with idle being unstable, as you have.
The source to that was the ignition advance unit.
On my unit I was able to adjust the tension on the springs to stabilize the idle.

Benton
 

Tornado

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Hello!

I had the same behaviour with idle being unstable, as you have.
The source to that was the ignition advance unit.
On my unit I was able to adjust the tension on the springs to stabilize the idle.

Benton
I'm running electronic ignition
 

Tornado

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What's the mileage ? Usually shot around 10,000. Higher mileages risk fracture of the slide(s) getting slurped into the motor and hopefully spit out the exhaust. Why risk it , start saving for upgrade carb(s).
Uncertain bike had only 7500 on clock when I got it two yrs ago. But only one carb fitted while other was in box. Did about 3500 on the single last year. Now running both carbs and have swapped in hardened anodized slides.
 

Tornado

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Wow I've never seen someone run a single Amal Concentric on a Norton.
Welp someone must have been buying the two into one mani's and single port ham can front plates sold by Norvil/AN/RGM etc which are not directly fittable to Mikuni carbs due to different flange bolt spacing and port sizing.
 

Tornado

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Just had Mr. Bruce Chessell sleeve my Amals and got them back today:

IMG_20191203_1345384.jpg


Slides have notably less slop in the bores. Can't test for quite a while as bike is being readied for winter work.
 
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Bruce did mine too. Great work with dissimilar metals. Brass sleeved slide into bored zinc pot metal body. Rock solid idle.
 
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Good move. Bruce did a number of my carbs. Change out the needle jets because old loose slides will wear these jets oval. Add Stay up floats and aluminum needle valves will make the stars all align.
Cheers.
 

Tornado

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Cables new. No resistance opening/closing grip against the slide springs. The slides were snapping shut immediately but rpm dropping back to idle still took a second or so.
 

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