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M carburetor leakage and tuning ?

K

Kevin Brooks

Member
Have an "51 M with partially rebuilt carb: new needle/seat cage and gasket, new float bowl gasket. Float level measured 1 5/16" per manual. Finding gas leaking out choke lever shaft after increasing engine speed control. What is likely causing the leak. Also, main fuel/air mixture screw currently set at 3 turns out. Not yet tuned for full throttle. Would leak disappear once tuned? Tractor head listed as 6336 for kerosene and carburetor has numbers matching those for kerosene. However, I only run gas.
 
(quoted from post at 12:33:37 04/05/10) Have an "51 M with partially rebuilt carb: new needle/seat cage and gasket, new float bowl gasket. Float level measured 1 5/16" per manual. Finding gas leaking out choke lever shaft after increasing engine speed control. What is likely causing the leak. Also, main fuel/air mixture screw currently set at 3 turns out. Not yet tuned for full throttle. Would leak disappear once tuned? Tractor head listed as 6336 for kerosene and carburetor has numbers matching those for kerosene. However, I only run gas.
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Sounds like you did everything right, BUT, make sure the float does NOT leak, is not dragging on the sides of the fuel bowl, and make sure that new float valve seat has a good gasket under it and that it is good and snug. If the float is right, and the float valve and seat are right, there should be NO gas leaking from the choke shaft area. Also, 3 turns out on the high idle screw (bottom) is enough, no need for any further adjustment unless the engine stalls or sputters under FULL LOAD. The idle/air mixture screw (top) is set at 1 1/2 turns out, and is only to be adjusted for a smooth idle AFTER the engine is warmed up.
 
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