Question about 2008 Triumph Triumph Bonneville

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2006 EFI Bonneville

How are spark plugd changed please?

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  • gerry_derkse Jan 07, 2009

    The Bonneville is a 2009 model EFI.

    Does the seat and petrol tank need to be taken off when replacing spark plugs please?

  • Strech
    Strech Jan 22, 2013

    Just to add to the other answers, I first loosen the plug about 1 or 2 turns. Then I blow a shot of compressed air around the base of the plug. If you don't have an air compressor, use a can of compressed air that is used for cleaning computers (Radio Shack, etc). The reason why is that dirt and crud tends to collect in the recess that the plug fits into. This will blow it out, so it won't fall into the cylinder through the spark plug hole when the plug is removed.


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No need to remove tank. I use an 18mm (i think) deep socket to loosen plug and slide a 8 inch piece of tygon tubing over the plug to screw it out. Insert new plug into the clear tubing to engage (start) the threads of new plug. Most hardware/home supply stores sell the clear soft plastic tubing very cheap. Take a new plug with you to get tubing that will fit snugly on the spark plug insulator. Tightend to specified torque setting and ride. Do not overtighten, as the aluminum head will strip easily.

Posted on Jan 10, 2009

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Take caps off the plugs. find a spark plug sprocket that fits. undo the plugs take them out. put the new ones and do upp till tight then give them a little nip just to make sure. put caps back on and job done.

Posted on Dec 31, 2008

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