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Float Adjustment #782797 08/27/19 8:38 pm
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Ianbuck Offline OP
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Just cleaned and services the Lighting carbs. Used a Sealey tempory fuel tank which made the job very easy, even using those original plastic floats, didn't take long.

I set the fuel hieght at 5mm down from the top if the bowl, level with the casting surrounding the needle valve brass body, see photo ...... does this seem about right?

Ian

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Re: Float Adjustment [Re: Ianbuck] #782798 08/27/19 8:56 pm
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Allan Gill Offline
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With the plastic float on a stock lightning 1.5mm from the top of the float bowl works well (0.060”)

Your fuel level position is about correct, one thing to bear in mind though is the effect of how high your dummy bottle is compared to the fuel tap on the bike, and the weight of the fuel in the tank, also because the carbs are fitted on an incline, it is better to do this on the bike with a modified drain screw and a short piece of pipe.


beerchug
Re: Float Adjustment [Re: Ianbuck] #782801 08/27/19 9:07 pm
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Ianbuck Offline OP
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I tried to get the position of the temporary tank to a similar level as the one on bike. This is really only to get me started, I anticipate lots of fettling, once it's running.

Re: Float Adjustment [Re: Ianbuck] #782839 08/28/19 5:52 am
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Allan Gill Offline
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The .060” scribed on the float bowl and adjusted to that with the top of the float meeting the mark, worked best when my lightning was stock and using plastic floats. I found 0.080 was too lean. Since using the premiers with stay up floats I’ve never adjusted them, found it’s the best way.


beerchug
Re: Float Adjustment [Re: Ianbuck] #782868 08/28/19 1:32 pm
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edunham Offline
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The .060" and .080" below the gasket surface that Allan is referring to is the float height for the older plastic floats. The original poster was referring to the fuel height, which is listed on Burlen/AMAL's website (I think it is roughly 4.5-6mm as I recall). The fuel height is the same for Premiers and non-Premiers, but the float height changes as a result of the Stay-up float.

Ed from NJ

Re: Float Adjustment [Re: Ianbuck] #782869 08/28/19 1:47 pm
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Ianbuck Offline OP
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Yes that is correct I was refering to the fuel height , Allan did say he thought my fuel level was about correct.

I was using the AMAL guidelines and chose 5mm after cleaning and rebuilding the carbs. Hopefully this will give me a good starting point. 🤞

Ian

Re: Float Adjustment [Re: edunham] #782911 08/28/19 9:24 pm
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Allan Gill Offline
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Originally Posted by edunham
The .060" and .080" below the gasket surface that Allan is referring to is the float height for the older plastic floats. The original poster was referring to the fuel height, which is listed on Burlen/AMAL's website (I think it is roughly 4.5-6mm as I recall). The fuel height is the same for Premiers and non-Premiers, but the float height changes as a result of the Stay-up float.

Ed from NJ


Please read my previous posts explaining just that.


beerchug
Re: Float Adjustment [Re: Ianbuck] #782938 08/29/19 12:35 am
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gavin eisler Offline
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Dont fiddle with the float height , I quite like fiddling with stuff for fiddling sake, but I have never been inclined to change float height, so long as its 1-2 mm below the face when inverted it will be fine.


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Re: Float Adjustment [Re: Ianbuck] #783949 09/11/19 1:37 am
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Semper Gumby Offline
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Originally Posted by Ianbuck
<snip>

I set the fuel hieght at 5mm down from the top if the bowl, level with the casting surrounding the needle valve brass body, see photo ...... does this seem about right?

Ian


The working range is 4-6mm so 5 should be fine. I set mine at 6mm. When I blip the throttle open the float level on the firebird goes up to 4mm!


"Don't trust your eyes if your imagination is out of focus." - Mark Twain

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