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I am trying to get my grandfathers 1941 John Deere B back up and running. I have put a rebuilt carburetor on it, had the magneto rebuilt, put new plugs in, changed the oil, put all new fuel in, and managed to get it started. This is still an old hand crank style. The problem I am having is people are telling me the tractor should run at a solid RPM. The tractor seems to ramp up and down almost as if it is firing to ramp up then missing a few times then firing again. The tractor doesn't die and moving the throttle will make the engine RPM's increase and decrease however it won't stay at a steady rate. Any words of wisdom? This really has me frustrated at this point.
 

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governor?
 

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I have not tried anything with the governor yet. What could I check or how would I know that that is the problem? I haven't torn that far into this tractor before so I am kind of a newbie on this one.
 

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Possibly an air leak? I know I just resealed the intake on my 318 because for an air leak. Maybe you have an air leak around the intake manifold or the carb. You can try spraying carb cleaner around the gasketed area. If there is a leak you will hear a change in the sound of the engine.
 

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I did test for air leaks at both the intake side and exhaust side. I have had the valve cover off and all valves appear to be working fine. The other thing that concerns me is that when you put the tractor under a load at all it will burp some smoke from the oil breather. Could I be getting blow by causing both issues?
 

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Does applying the choke make any difference?

Carb adjustment make any difference?
 

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Discussion Starter #7
Thank you for the help. I will give these things a shot and see where I end up. If I need more help I'll be back that's for sure.
 

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I am trying to get my grandfathers 1941 John Deere B back up and running. I have put a rebuilt carburetor on it, had the magneto rebuilt, put new plugs in, changed the oil, put all new fuel in, and managed to get it started. This is still an old hand crank style. The problem I am having is people are telling me the tractor should run at a solid RPM. The tractor seems to ramp up and down almost as if it is firing to ramp up then missing a few times then firing again. The tractor doesn't die and moving the throttle will make the engine RPM's increase and decrease however it won't stay at a steady rate. Any words of wisdom? This really has me frustrated at this point.[/QUOTE

the erratic idle could be caused by many things. clogged carb, mis adjusted carb,worn governor ect... number 1 are u sure carb has been gone threw and set up right? just because you bought a rebuilt carb means nothing. if carb is ruled out. erratic governor action can be caused by a bind in the throttle rod. the throttle ends need to be square.if it all checks out it could also be a worn governor idler gear . idle speed should be steady.

good luck:greentractorride:
 
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