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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 09-02-2011, 10:19 AM   #1 (permalink)
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Amal carb flange leveling

Hi again,

What's the simplest way to level a carb flange joining surface on my amal 900? I probably am not going to be able to get any grinding paste and the like and am likely going to just have sandpaper. What grit should I use and are there any rules of thumb for the process?

Thanks a lot.
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Old 09-02-2011, 11:41 AM   #2 (permalink)
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It's my understanding that flattening a bent mounting flange my sanding is pointless as the real problem is that the body will also have been bent resulting in the likelihood of binding the slide. There are threads on this showing the use of jigs to reverse the bend. If I find a link I will post it. Unless you are particularly handy it might be simpler to buy a new carb.

John
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Old 09-02-2011, 07:28 PM   #3 (permalink)
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You could chance the sandpaper method by buying a piece of heavy plate glass, 1/4" thick will do, and taping the sandpaper onto it. The plate glass is flat and should give you a flat enough flange to use the o-ring properly. If the carb body is distorted, i.e. the slide is sticking, look at it with the slide in it to see if you can find where the distortion is and then, using a couple of pieces of soft wood, clamp it in a vise and GENTLY apply bits of pressure to it until the slide works smoothly and freely. The key is to work the jaws in and out, checking the clearance each time. Finally, if it works for you, DON'T OVERTIGHTEN THE FLANGE NUTS when you mount the carb. There's a thread on this site about o-ring vs flat gasket that addresses this issue.

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Old 09-02-2011, 09:46 PM   #4 (permalink)
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If sandpaper can lap in a float bowl, why not the flange?

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Old 09-02-2011, 10:03 PM   #5 (permalink)
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Originally Posted by jimballard View Post
You could chance the sandpaper method by buying a piece of heavy plate glass, 1/4" thick will do, and taping the sandpaper onto it. The plate glass is flat and should give you a flat enough flange to use the o-ring properly.
I believe Lunmad has a vid demonstrating Jim's suggestion. He gives the grade of wet n dry as well.

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If the carb body is distorted, i.e. the slide is sticking, look at it with the slide in it to see if you can find where the distortion is and then, using a couple of pieces of soft wood, clamp it in a vise and GENTLY apply bits of pressure to it until the slide works smoothly and freely. The key is to work the jaws in and out, checking the clearance each time.
Great fix, Jim! If you have distortion, Landan, do Jim's distortion fix first. Then you may only need 800 or so wet n dry taped on the glass to smooth out flanges.

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Finally, if it works for you, DON'T OVERTIGHTEN THE FLANGE NUTS when you mount the carb.
Along with an oversize o-ring between the carb and manifold I also put two smaller viton o-rings on the studs as well. The viton stud o-rings are only half the thickness as the main o-ring which allows you to properly tighten the flange but also helps give support to the manifold thus helping to prevent warpage. Good luck.
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Old 09-02-2011, 10:35 PM   #6 (permalink)
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I believe Lunmad has a vid demonstrating Jim's suggestion. He gives the grade of wet n dry as well.
Look above.
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Old 09-02-2011, 10:59 PM   #7 (permalink)
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Look above.
Thanks Beemie. You posted while I was writing. Isn't Lunmad simply great.
















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Old 09-02-2011, 11:50 PM   #8 (permalink)
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DON'T EVER FILE,SAND OR LAP carb flanges flat.If the flange is bent,the whole body (including slide-bore) is bent.It must be straightened.

The only datum point you have to know when it's straight is that bent flange.When you've straightened out the flange (if done properly),the whole body is straight again.
If the body isn't straight,you can expect sticking slides.
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Old 09-03-2011, 12:28 AM   #9 (permalink)
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Originally Posted by Mr.Pete View Post
DON'T EVER FILE,SAND OR LAP carb flanges flat.If the flange is bent,the whole body (including slide-bore) is bent.It must be straightened.

The only datum point you have to know when it's straight is that bent flange.When you've straightened out the flange (if done properly),the whole body is straight again.
If the body isn't straight,you can expect sticking slides.
Mr. Pete knows. Thanks for setting me straight. I have smoothed out carburator adapters to accept a gasket that were scraped with 1000 wet n dry with water and soap atop a glass sheet. Never to flatten out a bend. I was thinking along the same lines with the flanges - smooth out, not flatten. Thanks. Mr. Pete.








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Old 09-03-2011, 03:28 AM   #10 (permalink)
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Originally Posted by triumpt120rv View Post
Mr. Pete knows. Thanks for setting me straight. I have smoothed out carburator adapters to accept a gasket that were scraped with 1000 wet n dry with water and soap atop a glass sheet. Never to flatten out a bend. I was thinking along the same lines with the flanges - smooth out, not flatten. Thanks. Mr. Pete.
Pete is a clever old bugger and should be listened to.

John Healy posted a drawing (I think it was) of a simple device for straightening these amal flanges. If I recall correctly, no rocket science was involved and the average guy would manage it. Seach BritBike, John Healy and carburettor flange. You may be lucky enough to jag it (it's no great search engine over there). RR
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