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bendix, carb, float, leak

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  #1  
Old 26th September 2014
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Default Help me with the physics of the Bendix float

Bike: 1972 XLH, stock air cleaner and pipes
Carb: Bendix with genuine Zenith rebuild kit

If I ever forget to shut off the fuel petcock, my Bendix carb leaks fuel from the accelerator pump. If I walk in the garage and I smell gas, it's a sure bet the petcock is on. No gas smell = petcock is off.

I've read through a handful of posts regarding this (here, and here, and here) and I think the issue may be with the float height. Sounds simple, but is it?

The float rises as the bowl fills and, as it rises, it pushes against the needle. If I flip the carb over and find that the 3/16 drill bit fits perfectly, where do I go from here? Slightly bigger or slightly smaller drill bit?

My guess is < 3/16" will raise the fuel level, and anything > 3/16" will lower the level. Is this correct?
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  #2  
Old 26th September 2014
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On a related note, when I rebuilt the carb and checked float height, I did so without gasket. There are posts in the discussions I listed above regarding whether the instructions that "the bottom surface of the float should be 3/16 inch from the gasket surface" means with or without. I read "gasket surface" as meaning the surface that the gasket lays on, but others read it as the surface of the gasket.

Who knows? I'll probably reset it with the gasket in place if the answer to my question above is "use a bigger drill bit".
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  #3  
Old 26th September 2014
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And you've got the float assist spring installed and pushing the right direction?

I've forgotten the petcock on mine a few times and never had a problem, but it sounds like yours would eventually leak all of your fuel into the crankcase.

I think I would disassemble the carb and hook up a fuel supply to it and check the needle and seat for proper functionality.
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  #4  
Old 26th September 2014
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did you put a new float needle in with the kit? if it's the old needle look to see if has a wear ring around where it fits into the carb body when it shuts off the fuel supply, also check where the needle seat to for wear. current needle full metal, or rubber tipped?
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Old 26th September 2014
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New rubber-tipped needle. The old one was worn as if it had been held against the seat to long; a sort of curved point.
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Old 26th September 2014
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Quote:
Originally Posted by bsaman View Post
...The old one was worn as if it had been held against the seat to long; a sort of curved point.
all metal? it can be reconditioned. the newer stuff with the viton/rubber tip, apparently does not play well with today's "gasoline". may or may not be the problem you have, just food for thought...
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Old 26th September 2014
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Alright I'm gonna add a new twist to this,I call it the lean factor.The 3/16th is meant for a stock bike with stock kick stand.I think like my bike has way to much lean for I have 8" over on tubes and a kick stand that is sort of bend and it leaks out the over flow.
I think one member here cut the viton off the needle and that worked for him.Seems to me back in the day they didn't have the rubber tip.So what I'm saying is you just have to play with the float setting but you also don't want to be running out of fuel when your buddy on the Evo is trying to run off and leave you.The 3/16th is what's recommended but not the only setting that'll work.I always shut fuel off on all my bikes always have.
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Old 26th September 2014
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While I always shut off the fuel I also run the bowl dry after every outing, this allows fresh gas into the carb for every start. Unless you have some serious lean to your bike 3/16" should be plenty, look to the seat, needle or spring, also look to the check for the pump.
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  #9  
Old 26th September 2014
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Quote:
Originally Posted by ezmerf View Post
Alright I'm gonna add a new twist to this,I call it the lean factor.The 3/16th is meant for a stock bike with stock kick stand.I think like my bike has way to much lean for I have 8" over on tubes and a kick stand that is sort of bend and it leaks out the over flow.
I think one member here cut the viton off the needle and that worked for him.Seems to me back in the day they didn't have the rubber tip.So what I'm saying is you just have to play with the float setting but you also don't want to be running out of fuel when your buddy on the Evo is trying to run off and leave you.The 3/16th is what's recommended but not the only setting that'll work.I always shut fuel off on all my bikes always have.

+ 1 ezmerf,,,,,,,,,, sage info and advice.
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  #10  
Old 27th September 2014
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Well, going back to the original requests: can anyone clue me in on the float adjustment? If I want to raise the float (shut off fuel earlier) and I'm holding the carb upside down, which way do I bend what?
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