Ccokshutt 30 will not run without choke

[Wayne11797]

Cockshutt 30 with Buda motor and marvel carb. The problem is I can"t get it to run properly without setting the choke mostly closed, the trap door is open. Everything that I can find has been rebuilt. Keep In mind that it runs GREAT at this setting. I would like to get the choke open and have it still run great. Any ideas out there. Thanks in advance.

 

[J.Wondergem]

Did you check for manifold, or gasket leaks?

 

[Anonymous-0]

sounds like the carb is still not metering enough fuel. the reason for the choke being closed is that the carb is set too lean for what ever reason and the motor is not getting fuel. try to open up the air screws, make sure fuel flow is good to the carb and just because it was rebuilt does not mean that it is clean internally. there could be a restricktion in the carb itself, i.e. plugged fuel or air passage. call me for more info if needed. 724/640-0426

 

[Tony Sha]

I just had the exact same problem with a 20 with a Marvel Sheibler carb. It drove me nuts for weeks until one day I had the carb apart for the fifth time when I noticed that the venturi was upside down. I flipped it over and now it runs like a gutshot panther!!!! Somehow the air flow in the venturi doesnt draw the fuel from the discharge tube when its backwards. Another funny thing is that it actually idled better with the venturi upside down! Good Luck!

 

[Wayne11797]

ok, Got the tank outlet unpluged and now have a good stream of fuel and will run without choke, but just barely, split the carb in halve and put it together with a good carb and found the bottom halve of my carb is bad. If I don"t get any other input I think I will soak the bottom halve of the carb in a cleaner for about 2 weeks and see what happens.