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I'm going thru the same thing - purchased bike with unkown maintainence intervals. Plug type is NGK DPR 8EA-9. $2.09/each at Auto Zone.
Valve adjustments may be due, depending on mileage.
I changed out all the fluids - or at least had them looked at by the shop - coolant, oil, clutch and brake.
If your going to attempt the valve adjustment on your own-the plugs can be changed without any fuss at all when the valve cover has been removed. If not there are a number of suggestions on how to do it - use the search feature to find them.
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