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internal spark plugs?

Discussion in 'BNS12 Chat & Tech' started by greenguzzi, Jul 14, 2011.

  1. greenguzzi

    greenguzzi Tuned and Synch'ed

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    Hi could somebody please explain what or where are internal spark plugs. Thanks
     
  2. Rafael

    Rafael GT Reference

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    "internal" is another fine example of Ital-glish. Inboard or another synonym would be more accurate.

    The 2 valve CARC bikes are dual plugged. The outboard plug is the one you see and the inboard plug is closer to the center line of the bike and is not visible until the tank is taken off. It's a smaller high mileage platinum plug that requires a thin wall socket to get it out. Since the plug hole is vertical the area should be blown clean with compressed are to prevent debris from falling into the comb chamber when removing it.
     
  3. greenguzzi

    greenguzzi Tuned and Synch'ed

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    Thanks allot I had no idea. The 4 valve heads don't have them I guess?
     
  4. rturo

    rturo Cruisin' Guzzisti GT Contributor

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    I changed the "outside" plug caps with the recommended better quality NGK items (thanks again for the tips Mr Roper). Has anybody had any problems with the inner plug caps or just changed them to NGK for peace of mind?

    Art
     
  5. Rafael

    Rafael GT Reference

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    4 valve head has the spark plug centrally located thru the valve cover like some American V8s. The cam is where the inboard plug would have gone. Guess there's no point in dual plugs if a plug is centrally located, they'd be too close together anyway and asymmetrical.

    Changed the inner plug. No problem with caps, but kinda hard to find plugs. Had to order from amazon or ebay. You can make your own thin wall socket or get one at MG Cycle.
     

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