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Case Tractors Discussion Forum
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SC Reving

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Dug G.

08-21-2004 16:41:51




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Started up are SC today for the first time in 3 yrs. and can't seem to get it to stay running below half throttle (revs up and down). Full throttle runs alright with an occasional miss in a cylinder. Checked timing and for a vaccuum leak, but never found either. Any suggestions? Thanks.




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todd hamilton

08-21-2004 19:34:39




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 Re: SC Reving in reply to Dug G., 08-21-2004 16:41:51  
I would pull the bottom off of the carb and check the float. A sticking float will cause this symptom. The zenith carb on an SC is small. It was designed that way for fuel economy but the least amount of dirt or other malfunction will cause the tractor to run poorly. If you can tune the rev out of it by pulling out the choke a little, you have carb trouble. Beyond that, check mag/distributor starting with point gap, then check the governor.

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Jerry W

08-22-2004 18:36:00




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 Re: SC Reving in reply to todd hamilton, 08-21-2004 19:34:39  
Too vague of a description to know for sure.

I would check to see if the throttle butterfly is being held open by the governor or by it self.

If not either then maybe the float is sticking although I doubt this one.

Jerry



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todd hamilton

08-22-2004 20:41:08




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 Re: SC Reving in reply to Jerry W, 08-22-2004 18:36:00  
Mine was running with these symptoms and the pin that the float hinges on was pushed out of position causing the float to stick. I don't think he will find any vacuum lines on an SC if it is original equipment.



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