Posted by Indiana Ken on February 29, 2012 at 08:22:32 from (66.249.234.170):
In Reply to: Modern spark plugs posted by matthies on February 29, 2012 at 07:11:59:
Quoting Removed, click Modern View to see
I am not familar with 560's and as such will keep this general; I believe you may have two problems: 1) Fouled (from fuel not oil) plugs suggests the mixture is too rich. This would apply to the high speed or power circuit of the carb. 2) Failure to take throttle and back firing suggests the mixture is too lean. This would apply to the idle, low speed circuit or transition circuit (if it has one) of the carb. This condition improves as the engine comes to running temperature since hot engines better atomize the fuel and can run on leaner mixtures. Sometimes the high speed circuit is set rich to compenstate for a faulty low speed circuit. If this is your situation, setting the high speed mixture such that it does not foul plugs may result in a tractor that will not run at low speed.
If the engine will run without miss at full power you can pretty much rule out ignition or spark related problems. One other thing to check is the exhaust manifold should have provisions to heat the inlet manifold to issure the fuel is atomized. If this feature is faulty and not providing heat it could contribute to failure to take throttle and the imporvement noted when the engine is hot.
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