I think Big fred hit it on the nose......Personally I often use a LITE coat of neversieze on spark plug threads(( usually where the plug is in a spot that is a bit-h to get to or the machine sets outside and water can pool around the plug))) and have never had a problem the engine running afterwards. This looks like a case of simply using way too much. Even then I don"t understand why the plug body didn"t ground to the block as the antisieze used looks like the type with copper in it so you"d think it would have acted as a conductor and not an isulator. To carry the thought a step further you stated the plugs were TIGHT. Typically overtightening a plug will cause internal damage to the plug that will prevent it from firing. It"s not so much the plug not grounding as it is the "circuit" gets broken internally and the plug is essentially dead wether it"s grounded or not. I"d be curious to test continuity between the electrode at the bottom of the plug and the wire connection at the top and see what the deal is there....
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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