dougjordan
New member
Just rebuilt carbs on my 78 R100 . So what do I set the fuel level to? 1/2" from top of bowl?
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According to the Airhead Guru in our club, the float level should be set to the fuel shuts off exactly when the float metal arm is perfectly parallel with the bottom of the carb where the float bowl attaches to the carb.
This has always been the suggestion as far back as I can remember...it's in my Haynes and/or Clymer manual. But what this assumes is that every float is exactly the same and works the same way. Rather than make that assumption, it's best to use the height of fuel as your guide. The "parallel" method might be a good starting point, but in the end, you want the right around of fuel in the carb so that the ability of the venturi effect in the throat of the carb pulls up the proper amount of fuel. If the fuel level is too low, the venturi has a harder time drawing the fuel up...the bike runs lean. If the fuel level is too high, the venturi can easily suck up the gas...the bike runs rich. The fuel height is what you want to shoot for.
Just rebuilt carbs on my 78 R100 . So what do I set the fuel level to? 1/2" from top of bowl?
All of the above and with KURT on pretty much everything. Especially the sticking float that is perhaps a bit cocked or something on the pin that it rides on. A bit of dirt can easily do this also by holding the needle open enough to cause problem. Yes, this can and does happen on one side and not the other. Are you SURE that the leak is coming out of the bowl and not a fuel line????.........Easy for the lines to deteriorate and LOOK like the bowl but in actuality it is a fuel line. Then, when foooling with the bowl one nudges the line just enough to stop the leak and NOT see it or notice it is a fuel line. Just a thought....it does happen.....like the other day when I fired up the bike after it setting for a month. The fuel line from the "t" to the carb was split where it attaches to the carb.........Replacement time, not just wiggle it till it stopped leaking, which for me, usually works.
Also.........If I am gonna not ride for a week or two or MORE I take the bowls off and sit them on top of the cylinder. Seems, at least to this ol common sense guy, that the floats dry out and dont give me problems. I have 2 sets of floats that are both pretty ancient and when one gets heavy enough to cause problems, I change them out and let them dry a few months or a year and then use them again......WHO knows???.....For me, it works.........God bless........Dennis