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john64 
Bronze Level
Joined: 03 Mar 2024
Location: Niwot Colo
Points: 21
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 Topic: B carb problem
Posted: 07 Oct 2024 at 2:00pm |
I planed to take my B to a show a few weeks ago. I always drain as much gas as possible and run it until the gas is burned out of the carb. When I tried to start it, it would fire for about 2 seconds and die. I pulled the carb and blew out the passages, didn't see any junk in it. Put it back on, same thing. I am running just purchased, no alcohol gas.
Do any of you have an idea of what could be the problem? TIA Btw, I'm also JohnCo, I keep having to change my name to get on.
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PaulB
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4740
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Posted: 07 Oct 2024 at 5:57pm |
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Not actually being able to see what's happing first hand, I'll tell you that often what you think is a fuel issue turns out to be an ignition issue and what you think is an ignition problem turns out to be fuel related.
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 81238
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Posted: 07 Oct 2024 at 7:35pm |
is there a drain plug on the carb ? Open it and see that you have flow.. If the BOWL is full, the engine should run close to a minute before running out of gas ... If a jet is plugged, you might have to move the CHOKE... but it still should run for a short period of time..
as Paul said, you could be looking at a bad coil / etc.
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Like them all, but love the "B"s.
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john64
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Joined: 03 Mar 2024
Location: Niwot Colo
Points: 21
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Posted: 07 Oct 2024 at 8:47pm |
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I get a steady flow from the drain plug so I assume the float valve is working properly. I have never had a coil go out on a mag like this, usually they work or not. For the two seconds it runs, it sounds strong. Once I try it and it runs, it won't start for maybe 10 minutes, again running for 2 seconds. Oh yeah, it runs on either for as long as I squirt it into the intake, so I guess that rules out the coil. A mystery for sure!
Edited by john64 - 07 Oct 2024 at 8:48pm
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 4665
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Posted: 07 Oct 2024 at 9:03pm |
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If you remove the air filter hose and keep spraying small amounts of starting fluid in the carburetor and you can keep it running, you can decide if it's a fuel or spark problem. From what you are saying, I am betting it's a fuel delivery or carburetor problem.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 07 Oct 2024 at 10:21pm |
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yep... you ruled out the SPARK !... Bowl is full, but will not run... but you can run on ether... Sounds like your main jet is plugged ! ... Time for a carburetor CLEANING.
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Like them all, but love the "B"s.
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john64
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Joined: 03 Mar 2024
Location: Niwot Colo
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Posted: 11 Oct 2024 at 12:44am |
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Well, it runs, don't really know what it was. I put another carb on and more non corn squeezens gas and it started. Probably enough bad gas to cause the problem. Anyway, thanks for the suggestions!
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