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We have taken these carbs apart and replaced everything to factory specifications, and gas still leaks out the intake holes for air on the idle circuit. Funny thing though, floats are working and it only does the leak with gasoline. Test runs with water solve the problem...then we clean them and try all over again only to find it still is leaking. Any help would be appreciated.
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Water and gasoline have different densities, so the floats will float higher with water, shutting the valves sooner.
My guess is that the float level is not set correctly. A common mistake is to measure from the top (the mounting surface) of the float, instead of the bottom of that step.
See if this picture shows how you are measuring your float height.
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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Are you floats really floating? Sometimes they spring a leak.
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BassCliffComment
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You are right about the density. It now seems to be more of an angle issue. I will try and adjust them again, but as kind of a litmus test I put them all the way closed first, to see if it stopped at all and it still didn't. The floats don't bubble when I put them in gasoline or water so they are floating...I know it has to be something so simple but it's blowing my mind.Comment
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Did you check to see if the needle valve is installed? Check the needle valve and seat fit also.You are right about the density. It now seems to be more of an angle issue. I will try and adjust them again, but as kind of a litmus test I put them all the way closed first, to see if it stopped at all and it still didn't. The floats don't bubble when I put them in gasoline or water so they are floating...I know it has to be something so simple but it's blowing my mind.Comment
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