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Tiffany Rowland

Oil in spark plug hole on 07 Honda trx400ex

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I recently purchased an 07 Honda sportrax and when I was checking the spark plug I saw the boot was ripped nearly in half. When I removed the plug it was blackened and covered in oil. How can I thoroughly clean the plug hole and remove any debris that is in there? Is there a small tube like vacuum or something of the sort made for stuff like this? The machine my dentist has would be perfect, maybe they do rentals! 😁

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From the shape of that plug it looks like it was letting oil get around that metal washer/gasket, just buy a new plug and that should solve your problem

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Putting a new plug in will most likely NOT solve your problem. It’s one of three things. 

1. bad valve seals which is a condition of oil in the valve cover getting by the valve stem seals and leaking into the cylinder head.  

2. bad rings and oil blow by from the rings is causing this condition. 
 

3. A rich fuel condition is causing the plug to blacken. Could be just a simple adjustment on the carburetor air/fuel mixture screw.   

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