Gas spewing from carb drain tubes
in [Tech]
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From: Matt Johnson on 15 Mar 2010 18:12 I ride a 1981 honda cb900c. Love the bike, but the other day i had some starting difficulties. The problem was the choke cable had slid down and popped out. Anyways, i fixed this, but to see what it was i had to remove the carburetor. Now i put everything back together and voila it starts up, but spews gas all over my garage floor... dad was happy about the smell. So i've done some research on this problem and it sounds like i did something to my float valves. What did i do and how do i undo it?
From: paul c on 15 Mar 2010 18:37 Matt Johnson wrote: > I ride a 1981 honda cb900c. Love the bike, but the other day i had > some starting difficulties. The problem was the choke cable had slid > down and popped out. Anyways, i fixed this, but to see what it was i > had to remove the carburetor. Now i put everything back together and > voila it starts up, but spews gas all over my garage floor... dad was > happy about the smell. > > So i've done some research on this problem and it sounds like i did > something to my float valves. What did i do and how do i undo it? Maybe there was some debris in the passages or lines and it fell into the openings and made the floats stick open or maybe they were already somewhat sticky with gum. It might clear by tapping them with a screwdriver handle or if you're energetic enough by bouncing the whole bike from the rear of the seat. Another mistake I make all the time is draining the carbs before I take them off and then forgetting to tighten the drain screws, that has similar effect.
From: paul c on 15 Mar 2010 18:44 paul c wrote: > Matt Johnson wrote: >> I ride a 1981 honda cb900c. Love the bike, but the other day i had >> some starting difficulties. The problem was the choke cable had slid >> down and popped out. Anyways, i fixed this, but to see what it was i >> had to remove the carburetor. Now i put everything back together and >> voila it starts up, but spews gas all over my garage floor... dad was >> happy about the smell. >> >> So i've done some research on this problem and it sounds like i did >> something to my float valves. What did i do and how do i undo it? > ... If the other thoughts don't work right away, I'd just get it outside, stub my cigarette and then look closely to see where the leak starts, maybe the hose is leaking at the petcock or above the carbs (I know you mentioned only one carb but I presume you have four of them) where the fuel line splits.
From: ` on 15 Mar 2010 19:02 On Mar 15, 3:12 pm, Matt Johnson <mouche.librem...(a)gmail.com> wrote: > So i've done some research on this problem and it sounds like i did > something to my float valves. What did i do and how do i undo it? I suppose there may be carburetors in which you can install the floats upside down... If you have to remove the carbs to check the float level, there will be a tiny wear mark on the tab that pushes the float valve closed. If you've somehow installed your floats upside down, you'll see that little wear market facing you...
From: paul c on 15 Mar 2010 19:42
paul c wrote: > paul c wrote: >> Matt Johnson wrote: >>> I ride a 1981 honda cb900c. Love the bike, but the other day i had >>> some starting difficulties. The problem was the choke cable had slid >>> down and popped out. Anyways, i fixed this, but to see what it was i >>> had to remove the carburetor. Now i put everything back together and >>> voila it starts up, but spews gas all over my garage floor... dad was >>> happy about the smell. >>> >>> So i've done some research on this problem and it sounds like i did >>> something to my float valves. What did i do and how do i undo it? >> ... > > If the other thoughts don't work right away, I'd just get it outside, > stub my cigarette and then look closely to see where the leak starts, > maybe the hose is leaking at the petcock or above the carbs (I know you > mentioned only one carb but I presume you have four of them) where the > fuel line splits. eg., if three carbs are sucking and one has a loose connection, it might not be a stuck float at all. |