I have often found that not running smooth when not under load and then clearing up under load can be an airleak. A leaking gasket between the manifold and head or the carb and intake. Could also be in the carburator. When the engine is not under load the the govornor is closing the butterfly in the carb. This puts more vacuum on the manifold making leaks worse. Under load the carb opens up and puts less vacuum on the manifold making air leaking in less. The air leaking in leans out the mixture and causes the chugging.
This may not be it but I have found this to be the cause in the past. A quick easy way to check is to drip some oil where the gaskets are while it is idling. If it cleans up when you put the oil around the gasket, thats it.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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