amal float level fixture

If by "pipe method" you mean attaching a pc of hose to the bowl drain plug and bending the hose up alongside the carb (which is what I do) the float level itself is irrelevant.
I just watch the fuel level. If it's even with the washer of the screw which holds the bowl up, you're good.

Mr Rick, yes that's the method I meant, I was interested if any one had took a final measurement to see if those who used the amal spec float height were in the right ball park, there's lots written about the figure given by amal and whether or not it takes the tilt into account, why is it the same figure for Triumph etc,etc, I know it's irrelevent to the hose method but have any curious minds took a float measurement after setting up this way?

I kind of wonder if the float level isn't just a rough beginning and the final correct result is from the setting of the mixture screw?

brxpb said:

Mr Rick, yes that's the method I meant, I was interested if any one had took a final measurement to see if those who used the amal spec float height were in the right ball park, there's lots written about the figure given by amal and whether or not it takes the tilt into account, why is it the same figure for Triumph etc,etc, I know it's irrelevent to the hose method but have any curious minds took a float measurement after setting up this way?

Click to expand...

I set the fuel levels at the mid position with the bowls horizontal. The Concentric Mk1 fuel level isn't super-critical as the standard setting is between 0.017" and 0.025". I doubt the slight tilt of the Commando's carbs alters the mixture by much, if at all.

http://amalcarb.co.uk/rebuilding-mark-1 ... arburetter

brxbp: In reference to your question about " to see if those who used the amal spec float height "
The latest Amal instructions for this carb (link posted above by L.A.B.) do not even mention float height, as far as I can see. Which makes sense. Whatever the float might be doing, if the fuel level is not approx correct with the carbs fitted, you'd have a poor setup.
From the link:
" Because there have been changes to the float chamber since the Concentric carburetter was introduced, and because there is no way of knowing what alterations may have been made by a previous owner, measuring the fuel level is the best way of setting up the float chamber.

The correct fuel level for all Mark 1 Concentric carburetters is 0.21" plus or minus 0.040" below the top edge of the float bowl. Thus when the needle valve is being held shut by the tangs of the float, the level of the fuel will be between 0.017" to 0.25" (4.33mm to 6.35mm) from the top of the bowl. "

Which is a long way of saying sorry, NO, I did not compare. And even if I had a float height spec, you couldn't pay me enough to pull the carbs off and check. That is one real PIA routine, even if I have figured out a way to get at those inside screws.

Theoretically, the floats and bowls are symmetrical, so the fuel level in the centre should not change no matter what angle the bowl is. Therefore you might as well set the fuel heights with the bowls level, then you will get an accurate reading of the fuel level below the top of the bowl, as has been specified here.

After all, its the fuel level right in the middle where the jets are, that matters.

Dereck

ps as for the plus or minus allowance in level, I prefer to get them exactly the same. After all, you would not ride you bike with one foot peg higher than the other, or with bent handle bars would you.

I see in latest newsletter from Andover Norton they have a little tool for checking float level, if I remember correctly about 8 quid.

I was pretty pleased with the balance and response from my Amals. I noticed that one carb primed (tickled) almost instantaneously. Decided the float height was probably too high. Finally got round to adjusting a week ago or so.

Now not so pleased as have introduced an occasional stutter or hesitation on throttle roll on. Probably play with the pilot adjusters see if I can cure it. Always something hey ho.

I find that setting the top edge of the float opposite the pin at 1mm below the edge of the bowl works well. When setting the fuel level measured at the center of the bowl, while the bowl is level could create a problem if it is set too high. The issue is, as I see it, is that once the carb is installed and at its 10 degree angle, the fuel level is the same as was set at the center of the bowl but could be above the gasket surface at the front of the carb, if set too high. Using the tube method connected to the drain plug you will see that 1mm at the front of the bowl translates to roughly 5-6 mm at the center of the bowl.
Pete

I've noticed that there is a big difference between setting the float level on the bench and checking it again immediately after a ride. Any one know what the level should be when pulling into the driveway and immediately shutting off the fuel? I read somewhere about drilling the float bowl for better flow.